Dr Yah Leng Lim
UQ Amplify Researcher
School of Information Technology and Electrical Engineering
+61 7 336 54539
Journal Articles
Qi, Xiaoqiong, Bertling, Karl, Taimre, Thomas, Agnew, Gary, Lim, Yah Leng, Gillespie, Tim, Robinson, Ashley, Brünig, Michael, Demić, Aleksandar, Dean, Paul, Li, Lian He, Linfield, Edmund H., Davies, A. Giles, Indjin, Dragan and Rakić, Aleksandar D. (2021). Observation of optical feedback dynamics in single-mode terahertz quantum cascade lasers: Transient instabilities. Physical Review A, 103 (3) 033504, 033504-1-033504-7. doi: 10.1103/physreva.103.033504
Qi, Xiaoqiong, Agnew, Gary, Taimre, Thomas, Han, She, Lim, Yah Leng, Bertling, Karl, Demic, Aleksandar, Dean, Paul, Indjin, Dragan and Rakic, Aleksandar (2020). Laser feedback interferometry in multi-mode terahertz quantum cascade lasers. Optics Express, 28 (10), 14246-14262. doi: 10.1364/oe.390433
Agnew, Gary, Indjin, Dragan, Rakic, Aleksandar D., Grier, Andrew, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Ikonic, Zoran, Dean, Paul, Valavanis, Alexander and Harrison, Paul (2020). Corrections to “Temperature-Dependent High-Speed Dynamics of Terahertz Quantum Cascade Lasers”. IEEE Journal of Selected Topics in Quantum Electronics, 26 (2) 8910553, 1-1. doi: 10.1109/jstqe.2019.2954695
Keeley, J., Bertling, K., Rubino, P. L., Lim, Y. L., Taimre, T., Qi, X., Kundu, I., Li, L. H., Indjin, D., Rakić, A. D., Linfield, E. H., Davies, A. G., Cunningham, J. and Dean, P. (2019). Detection sensitivity of laser feedback interferometry using a terahertz quantum cascade laser. Optics Letters, 44 (13), 3314-3317. doi: 10.1364/ol.44.003314
Rakić, A. D., Taimre, T., Bertling, K., Lim, Y. L., Dean, P., Valavanis, A. and Indjin, D. (2019). Sensing and imaging using laser feedback interferometry with quantum cascade lasers. Applied Physics Reviews, 6 (2) 021320, 021320. doi: 10.1063/1.5094674
Lim, Yah Leng, Bertling, Karl, Taimre, Thomas, Gillespie, Tim, Glenn, Chris, Robinson, Ashley, Indjin, Dragan, Han, Yingjun, Li, Lianhe, Linfield, Edmund H., Davies, A. Giles, Dean, Paul and Rakić, Aleksandar D. (2019). Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers. Optics Express, 27 (7), 10221-10233. doi: 10.1364/oe.27.010221
Keeley, James, Freeman, Joshua, Bertling, Karl, Lim, Yah Leng, Mohandas, Reshma A., Taimre, Thomas, Li, Lianhe H., Indjin, Dragan, Rakić, Aleksandar D., Linfield, Edmund H., Davies, A. Giles and Dean, Paul (2018). Publisher Correction: Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry. Scientific Reports, 8 (1) 17648, 17648. doi: 10.1038/s41598-018-36015-w
Bertling, Karl, Han, She, Wu, Tengfei, Zhao, Chen, Lim, Yah Leng, Dean, Paul, Khanna, Suraj P., Indjin, Dragan, Linfield, Edmund H., Davies, A. Giles, Wilson, Stephen J., Taimre, Thomas and Rakic, Alexandar D. (2018). Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser. IEEE Sensors Letters, 2 (3), 1-1. doi: 10.1109/lsens.2018.2858927
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Ikonic, Zoran, Dean, Paul, Valavanis, Alexander, Indjin, Dragan and Rakic, Aleksandar D. (2018). Frequency tuning range control in pulsed terahertz quantum-cascade lasers: applications in interferometry. IEEE Journal of Quantum Electronics, 54 (2) 2300108, 1-8. doi: 10.1109/JQE.2018.2806948
Keeley, James, Freeman, Joshua, Bertling, Karl, Lim, Yah L., Mohandas, Reshma A., Taimre, Thomas, Li, Lianhe H., Indjin, Dragan, Rakic, Aleksandar, Linfeld, Edmund H., Davies, A. Giles and Dean, Paul (2017). Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry. Scientific Reports, 7 (1) 7236, 7236.1-7236.9. doi: 10.1038/s41598-017-07432-0
Qi, Xiaoqiong, Agnew, Gary, Kundu, Iman, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Dean, Paul, Grier, Andrew, Valavanis, Alexander, Linfield, Edmund H., Davies, A. Giles, Indjin, Dragan and Rakic, Aleksandar D. (2017). Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer. Optics Express, 25 (9), 10153-10165. doi: 10.1364/OE.25.010153
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Ikonic, Zoran, Dean, Paul, Valavanis, Alexander, Harrison, Paul, Indjin, Dragan and Rakic, Aleksandar D. (2016). Temperature dependent high speed dynamics of terahertz quantum cascade lasers. IEEE Journal of Selected Topics in Quantum Electronics, 23 (99) 7792643, 1-9. doi: 10.1109/JSTQE.2016.2638539
Grier, Andrew, Dean, Paul, Valavanis, Alexander, Keeley, James, Kundu, Iman, Cooper, Jonathan D., Agnew, Gary, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Rakic, Aleksander D., Li, Lianhe H., Harrison, Paul, Linfield, Edmund, Ikonic, Zoran, Davies, A. Giles and Indjin, Dragan (2016). Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers. Optics Express, 24 (19), 21948-21956. doi: 10.1364/OE.24.021948
Mowla, Alireza, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Wilson, Stephen J., Prow, Tarl W., Soyer, H. Peter and Rakic, Aleksandar D. (2016). Concurrent reflectance confocal microscopy and laser doppler flowmetry to improve skin cancer imaging: a Monte Carlo model and experimental validation. Sensors, 16 (9) 1411, 1411. doi: 10.3390/s16091411
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Ikonić, Zoran, Valavanis, Alexander, Dean, Paul, Cooper, Jonathan, Khanna, Suraj P., Lachab, Mohammad, Linfield, Edmund H., Davies, A. Giles, Harrison, Paul, Indjin, Dragan and Rakić, Aleksandar D. (2016). Model for a pulsed terahertz quantum cascade laser under optical feedback. Optics Express, 24 (18), 20554-20570. doi: 10.1364/OE.24.020554
Mowla, Alireza, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Wilson, Stephen J., Prow, Tarl W. and Rakic, Aleksandar D. (2016). A compact laser imaging system for concurrent reflectance confocal microscopy and laser doppler flowmetry. IEEE Photonics Journal, 8 (5) 3900709, 1-9. doi: 10.1109/JPHOT.2016.2599014
Bertling, Karl, Taimre, Thomas, Agnew, Gary, Lim, Yah Leng, Dean, Paul, Indjin, Dragan, Hofling, Sven, Weih, Robert, Kamp, Martin, von Edlinger, Michael, Koeth, Johannes and Rakic, Aleksandar (2016). Simple Electrical Modulation Scheme for Laser Feedback Imaging. IEEE Sensors Journal, 16 (7) 7350095, 1937-1942. doi: 10.1109/JSEN.2015.2507184
Han, She, Bertling, Karl, Dean, Paul, Keeley, James, Burnett, Andrew D., Lim, Yah Leng, Khanna, Suraj P., Valavanis, Alexander, Linfield, Edmund H., Davies, A. Giles, Indjin, Dragan, Taimre, Thomas and Rakic, Aleksandar (2016). Laser feedback interferometry as a tool for analysis of granular materials at terahertz frequencies: towards imaging and identification of plastic explosives. Sensors, 16 (3) 352, 352+. doi: 10.3390/s16030352
Lui, H. S., Taimre, T., Bertling, K., Lim, Y. L., Dean, P., Khanna, S. P., Lachab, M, Valavanis, A., Indjin, D., Linfield, E. H., Davies, A. G. and Rakic, A. D. (2015). Terahertz Radar Cross Section Characterization using Laser Feedback Interferometry with a Quantum Cascade Laser. Electronics Letters, 51 (22), 1774-1776. doi: 10.1049/el.2015.2878
Taimre, Thomas, Nikolic, Milan, Bertling, Karl, Lim, Yah Leng, Bosch, Thierry and Rakic, Aleksandar (2015). Laser feedback interferometry: a tutorial on the self-mixing effect for coherent sensing. Advances in Optics and Photonics, 7 (3), 570-631. doi: 10.1364/AOP.7.000570
Agnew, G., Grier, A., Taimre, T, Lim, Y. L., Nikolic, M, Valavanis, A., Cooper, J., Dean, P., Khanna, S. P., Lachab, M., Linfield, E. H., Davies, A. G., Harrison, P., Ikonic, Z., Indjin, D. and Rakic, A. D. (2015). Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations. Applied Physics Letters, 106 (16) 161105, 161105-1-161105-4. doi: 10.1063/1.4918993
Nikolic, Milan, Lim, Yah Leng, Bertling, Karl, Taimre, Thomas and Rakic, Aleksandar (2015). Multiple signal classification for self-mixing flowmetry. Applied Optics, 54 (9), 2193-2198. doi: 10.1364/AO.54.002193
Dean, P., Keeley, J., Valavanis, A., Bertling, K., Lim, Y. L., Taimre, T., Alhathlool, R., Li, L. H., Indjin, D., Rakić, A. D., Linfield, E. H. and Davies, A. G. (2015). Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser. Optics Letters, 40 (6), 950-953. doi: 10.1364/OL.40.000950
Keeley, J., Dean, P., Valavanis, A., Bertling, K., Lim, Y. L., Alhathlool, R., Taimre, T., Li, L. H., Indjin, D., Aleksandar, A. D., Linfield, E. H. and Davies, A. G. (2015). Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser. Optics Letters, 40 (6), 994-997. doi: 10.1364/OL.40.000994
Al Roumy, Jalal, Perchoux, Julien, Lim, Yah Leng, Taimre, Thomas, Rakic, Aleksandar D. and Bosch, Thierry (2015). Effect of injection current and temperature on signal strength in a laser diode optical feedback interferometer. Applied Optics, 54 (2), 312-318. doi: 10.1364/AO.54.000312
Lim, Yah Leng, Taimre, Thomas, Bertling, Karl, Dean, Paul, Indjin, Dragan, Valavanis, Alexander, Khanna, Suraj P., Lachab, Mohammad, Schaider, Helmut, Prow, Tarl W., Soyer, H. Peter, Wilson, Stephen J., Linfield, Edmund H., Davies, A. Giles and Rakic, Aleksandar D. (2014). High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry. Biomedical Optics Express, 5 (11), 3981-3989. doi: 10.1364/BOE.5.003981
Rakic, Aleksandar, Karl Bertling, Yah Leng Lim, Wilson, Stephen J., Milan Nikolic, Thomas Taimre, Dragan Indjin, Alexander Valavanis, Edmund H. Linfield, A. Giles Davies, Graeme Walker, Blake Ferguson, Tarl Prow, Helmut Schaider and Soyer, H. Peter (2014). Biomedical applications of terahertz self-mixing interferometry. SPIE Newsroom doi: 10.1117/2.1201409.005613
Nikolic, M., Taimre, T., Tucker, J., Lim, Yah Leng, Bertling, K. and Rakic, A. D. (2014). Laser dynamics under frequency-shifted optical feedback with random phase. Electronics Letters, 50 (19), 1380-1382. doi: 10.1049/el.2014.2573
Dean, P., Valavanis, A., Keeley, J., Bertling, K., Lim, Y. L., Alhathlool, R., Burnett, A. D., Khanna, S. P., Indjin, D., Taimre, T., Rakić, A. D., Linfield, E. H, and Davies, A. G. (2014). Terahertz imaging using quantum cascade lasers: a review of systems and applications. Journal of Physics D: Applied Physics, 47 (37) 374008, 374008.1-374008.22. doi: 10.1088/0022-3727/47/37/374008
Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Dean, Paul, Indjin, Dragan and Rakic, Aleksandar D. (2014). Methodology for materials analysis usinpg swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers. Optics Express, 22 (15), 18633-18647. doi: 10.1364/OE.22.018633
Kliese, Russel, Taimre, Thomas, Bakar, A. Ashrif A., Lim, Yah Leng, Bertling, Karl, Nikolić, Milan, Perchoux, Julien, Bosch, Thierry and Rakić, Aleksandar D. (2014). Solving self-mixing equations for arbitrary feedback levels: a concise algorithm. Applied Optics, 53 (17), 3723-3736. doi: 10.1364/AO.53.003723
Lui, H. S., Taimre, T., Bertling, K., Lim, Y. L., Dean, P., Khanna, S. P., Lachab, M., Valavanis, A., Indjin, D., Linfield, E. H., Davies, A. G. and Rakic, A. D. (2014). Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser. Optics Letters, 39 (9), 2629-2632. doi: 10.1364/OL.39.002629
Tucker, John R., Mowla, Alireza, Herbert, Jeremy, Fuentes, Miguel A., Freakley, Craig S., Bertling, Karl, Lim, Yah Leng, Matharu, Ranveer S., Perchoux, Julien, Taimre, Thomas, Wilson, Stephen J. and Rakic, Aleksandar D. (2014). Self-mixing sensing system based on uncooled vertical-cavity surface-emitting laser array: linking multichannel operation and enhanced performance. Optics Letters, 39 (2), 394-397. doi: 10.1364/OL.39.000394
Bertling, K., Lim, Y. L., Taimre, T., Indjin, D., Dean, P., Weih, R., Höfling, S., Kamp, M., von Edlinger, M., Koeth, J. and Rakić, A. (2013). Demonstration of the self-mixing effect in interband cascade lasers. Applied Physics Letters, 103 (23) 231107, 231107.1-231107.3. doi: 10.1063/1.4839535
Nikolić, Milan, Hicks, Elaine, Lim, Yah Leng, Bertling, Karl and Rakić, Aleksandar (2013). Self-mixing laser Doppler flow sensor: an optofluidic implementation. Applied Optics, 52 (33), 8128-8133. doi: 10.1364/AO.52.008128
Dean, Paul, Valavanis, Alex, Keeley, James, Bertling, Karl, Lim, Yah Leng, Alhathlool, Raed, Chowdhury, Siddhant, Taimre, Thomas, Li, Lianhe H., Indjin, Dragan, Wilson, Stephen J., Rakić, Aleksandar, Linfield, Edmund H. and Davies, A. Giles (2013). Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser. Applied Physics Letters, 103 (18) 181112, 181112.1-181112.4. doi: 10.1063/1.4827886
Rakić, Aleksandar, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Dean, Paul, Indjin, Dragan, Ikonić, Zoran, Harrison, Paul, Valavanis, Alexander, Khanna, Suraj P., Lachab, Mohammad, Wilson, Stephen J., Linfield, Edmund H. and Davies, A. Giles (2013). Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis. Optics Express, 21 (19), 22194-22205. doi: 10.1364/OE.21.022194
Nikolic, Milan, Jovanovic, Dejan P., Lim, Yah Leng, Bertling, Karl, Taimre, Thomas and Rakic, Aleksandar D. (2013). Approach to frequency estimation in self-mixing interferometry: multiple signal classification. Applied Optics, 52 (14), 3345-3350. doi: 10.1364/AO.52.003345
Bakar, A. Ashrif A., Lim, Yah Leng, Wilson, Stephen J., Fuentes, Miguel, Bertling, Karl, Taimre, Thomas, Bosch, Thierry and Rakic, Aleksandar D. (2013). On the feasibility of self-mixing interferometer sensing for detection of the surface electrocardiographic signal using a customized electro-optic phase modulator. Physiological Measurement, 34 (2), 281-289. doi: 10.1088/0967-3334/34/2/281
Campagnolo, Lucie, Nikolić, Milan, Perchoux, Julien, Lim, Yah Leng, Bertling, Karl, Loubière, Karine, Prat, Laurent, Rakić, Aleksandar D. and Bosch, Thierry (2013). Flow profile measurement in microchannel using the optical feedback interferometry sensing technique. Microfluidics and Nanofluidics, 14 (1-2), 113-119. doi: 10.1007/s10404-012-1029-0
Valavanis, Alex, Dean, Paul, Lim, Yah Leng, Alhathlool, Raed, Nikolić, Milan, Kliese, Russell, Khanna, Suraj P., Indjin, Dragan, Wilson, Stephen J., Rakić, Aleksandar D., Linfield, Edmund H. and Davies, Giles (2013). Self-mixing interferometry with terahertz quantum cascade lasers. IEEE Sensors Journal, 13 (1), 37-43. doi: 10.1109/JSEN.2012.2218594
Matharu, Ranveer S., Perchoux, Julien, Kliese, Russell, Lim, Yah Leng and Rakić, Aleksandar D. (2011). Maintaining maximum signal-to-noise ratio in uncooled vertical-cavity surface-emitting laser-based self-mixing sensors. Optics Letters, 36 (18), 3690-3692. doi: 10.1364/OL.36.003690
Lim, Yah Leng, Dean, Paul, Nikolic, Milan, Kliese, Russell, Khanna, Suraj P., Lachab, Mohammad, Valavanis, Alex, Indjin, Dragan, Ikonic, Zoran, Harrison, Paul, Linfield, Edmund H., Davies, A. Giles, Wilson, Stephen J. and Rakic, Aleksandar D. (2011). Demonstration of a self-mixing displacement sensor based on terahertz quantum cascade lasers. Applied Physics Letters, 99 (8) 081108, 081108-1-081108-3. doi: 10.1063/1.3629991
Dean, Paul, Lim, Yah Leng, Valavanis, Alex, Kliese, Russell, Nikolic, Milan, Khanna, Suraj P., Lachab, Mohammad, Indjin, Dragan, Ikonic, Zoran, Harrison, Paul, Rakic, Aleksandar D., Linfield, Edmund H. and Davies, A. Giles (2011). Terahertz imaging through self-mixing in a quantum cascade laser. Optics Letters, 36 (13), 2587-2589. doi: 10.1364/OL.36.002587
Lim, Yah Leng, Kliese, Russell, Bertling, Karl, Tanimizu, Katsuyoshi, Jacobs, P. A. and Rakić, Aleksandar D. (2010). Self-mixing flow sensor using a monolithic VCSEL array with parallel readout. Optics Express, 18 (11), 11720-11727. doi: 10.1364/OE.18.011720
Kliese, Russell, Lim, Yah Leng, Bosch, Thierry and Rakić, Aleksandar D. (2010). GaN laser self-mixing velocimeter for measuring slow flows. Optics Letters, 35 (6), 814-816. doi: 10.1364/OL.35.000814
Lim, Yah Leng, Nikolic, Milan, Bertling, Karl, Kliese, Russell and Rakic, Aleksandar, D. (2009). Self-mixing imaging sensor using a monolithic VCSEL array with parallel readout. Optics Express, 17 (7), 5517-5525. doi: 10.1364/OE.17.005517
Tucker, J.R., Baque, J.L., Lim, Y.L., Zvyagin, A.V. and Rakic, A.D. (2007). Parallel self-mixing imaging system based on an array of vertical-cavity surface-emitting lasers. Applied Optics, 46 (25), 6237-6246. doi: 10.1364/AO.46.006237
Conference Papers
Singh, Khushboo, Bandyopadhyay, Aparajita, Bertling, Karl, Lim, Yah Leng, Gillespie, Tim, Robinson, Ashley, Indjin, Dragan, Han, Yingjun, Li, Lianhe, Linfield, Edmund H., Davies, A. Giles, Dean, Paul, Rakic, Aleksandar D. and Sengupta, Amartya (2020). Monitoring water dynamics in plants using laser feedback interferometry. Conference on Lasers and Electro-Optics/Pacific Rim 2020, Sydney, Australia, 3–5 August 2020. Washington, DC, United States: OSA. doi: 10.1364/cleopr.2020.c12b_4
Xiaoqiong, Qi , Agnew, Gary , Kundu, Iman , Taimre, Thomas , Lim, Yah Leng , Bertling, Karl , Han, She , Dean, Paul , Grier, Andrew , Valavanis, Alexander , Linfield, Edmund , Davies, A. Giles , Indjin, Dragan and Rakic, Aleksandar (2017). Dynamic modelling of coupled-cavity Terahertz Quantum Cascade lasers with optical feedback. ITQW 2017: 14th International Conference on Intersubband Transitions in Quantum Wells, Sands Expo and Convention Center, Singapore, 11-15 September 2017.
Rakić, Aleksandar D., Agnew, Gary, Qi, Xiaoqiong, Taimre, Thomas, Grier, Andrew, Lim, Yah Leng, Bertling, Karl, Ikonić, Zoran, Valavanis, Alexander, Dean, Paul, Cooper, Jonathan, Khanna, Suraj P., Lachab, Mohammad, Wilson, Stephen J., Linfield, Edmund H., Davies, A. Giles, Harrison, Paul and Indjin, Dragan (2016). Laser feedback interferometry with THz QCLs: a new technology for imaging and materials analysis. The 8th International Symposium on Ultrafast Phenomena and Terahertz Waves, Chongqing, China, 10–12 October 2016. Washington, DC, United States: Optical Society of America. doi: 10.1364/ISUPTW.2016.IW4A.1
Keeley, J., Freeman, J., Valavanis, A., Mohandas, R., Bertling, Karl, Taimre, Thomas, Lim, Yah Leng, Li, L. H., Indjin, D., Rakic, Aleksandar, Linfield, E. H., Davies, A. G. and Dean, P. (2016). Self-mixing as a means of spectral characterisation of a Terahertz QCL. UK Semiconductors 2016, Sheffield, United Kingdom, 6-7 July 2016.
Keeley, J., Freeman, J., Valavanis, A., Mohandas, R., Bertling, Karl, Taimre, Thomas, Lim, Yah Leng, Li, L. H., Indjin, D., Rakic, Aleksandar, Linfield, E. H., Davies, A. G. and Dean, P. (2016). Spectral characterisation of a Terahertz QCL through self-mixing. International Quantum Cascade Lasers School and Workshop 2016 (IQCLSW 2016), Cambridge, UK, 4-9 September 2016.
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Ikonić, Zoran, Valavanis, Alexander, Dean, Paul, Cooper, Jonathan, Khanna, Suraj P., Lachab, Mohammad, Linfield, Edmund H., Davies, A. Giles, Harrison, Paul, Indjin, Dragan and Rakić, Aleksandar D. (2016). Interferometry via thermal modulation in low duty cycle pulsed terahertz QCLs. International Quantum Cascade Lasers School and Workshop 2016 (IQCLSW 2016), Cambridge, United Kingdom, 4 September – 9 September 2016.
Agnew, G., Grier, A., Taimre, T., Lim, Y. L., Bertling, K., Ikonic, Z., Valavanis, A., Dean, P., Cooper, J., Khanna, S. P., Lachab, M., Linfield, E. H., Davies, A. G., Harrison, P., Indjin, D. and Rakić, A. D. (2016). Prediction of Turn-on Delay in a Pulsed Terahertz Quantum Cascade Laser. Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD 2016), Sydney, Australia, 12-14 December 2016.
Mowla, Alireza, Taimre, Thomas, Lim, Yah L., Bertling, Karl, Wilson, Stephen J., Prow, Tarl W., Soyer, H. Peter and Rakić, Aleksandar D. (2016). Diffuse reflectance imaging for non-melanoma skin cancer detection using laser feedback interferometry. SPIE Photonics Europe, Brussels, Belguim, 3-7 April 2016. BELLINGHAM: SPIE. doi: 10.1117/12.2227449
Rakic, Aleksandar, Agnew, Gary, Qi, Xiaoqiong, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Han, She, Wilson, Stephen J., Grier, Andrew, Kundu, Iman, Li, Lianhe, Valavanis, Alexander, Dean, Paul, Ikonic, Zoran, Cooper, Jonathan, Khanna, Suraj P., Lachab, Mohammad, Linfield, Edmund H., Davies, A. Giles, Harrison, Paul and Indjin, Dragan (2016). Terahertz Frequency Quantum Cascade Lasers: Optical Feedback Effects and Applications. 16th International Conference on Numerical Simulation of Optoelectronic Devices, Sydney, Australia, 11-15 July 2016. NEW YORK: IEEE. doi: 10.1109/NUSOD.2016.7546996
Rakic, Aleksandar D., Lim, Yah Leng, Taimre, Thomas, Agnew, Gary, Qi, Xiaoqiong, Bertling, Karl, Han, She, Wilson, Stephen J., Kundu, Iman, Grier, Andrew, Ikonić, Zoran, Valavanis, Alexander, Demić, Aleksandar, Keeley, James, Li, Lianhe H., Linfield, Edmund H., Davies, A. Giles, Harrison, Paul, Ferguson, Blake, Walker, Graeme, Prow, Tarl, Indjin, Dragan and Soyer, H. Peter (2016). Optical feedback effects on terahertz quantum cascade lasers: modelling and applications. Infrared, Millimeter-Wave, and Terahertz Technologies IV, Beijing, China, 12 October 2016. Bellingham, WA, United States: S P I E - International Society for Optical Engineering. doi: 10.1117/12.2250621
Mowla, Alireza, Taimre, Thomas, Lim, Yah Leng and Rakic, Aleksandar D. (2015). Monte Carlo Model of laser Doppler perfusion imaging in skin cancer detection. Conference on Lasers and Electro-Optics Pacific Rim, Busan, South Korea, 24-28 August 2015. Piscataway, NJ, United States: IEEE. doi: 10.1109/CLEOPR.2015.7376039
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Lim, Yah Leng, Ikonić, Zoran, Dean, Paul, Khanna, Suraj P., Lachab, Mohammad, Valavanis, Alexander, Cooper, Jonathan, Harrison, Paul, Linfield, Edmund H., Davies, A. Giles, Indjin, Dragan and Rakić, Aleksandar D. (2015). Terahertz quantum cascade laser bandwidth prediction. IEEE International Topical Meeting on Microwave Photonics, Paphos, Cyprus, 26-29 October 2015. Piscataway, NJ, United States: IEEE. doi: 10.1109/MWP.2015.7356671
Mowla, Alireza, Nikolić, Milan, Taimre, Thomas, Tucker, John, Lim, Yah Leng, Bertling, Karl and Rakić, Aleksandar (2015). Effect of the optical system on the Doppler spectrum in laser-feedback interferometry. Washington, DC, United States: Optical Society of America. doi: 10.1364/AO.54.000018
Mowla, Alireza, Nikolic, Milan, Lim, Yah Leng, Bertling, Karl, Rakic, Aleksandar D. and Taimre, Thomas (2014). Effect of the optical numerical aperture on the Doppler spectrum in laser Doppler velocimetry. Conference on Optoelectronic and Microelectronic Materials and Devices, Perth, WA, Australia, 14-17 December 2014. Perth, WA, Australia: Institute of Electrical and Electronic Engineers. doi: 10.1109/COMMAD.2014.7038654
Agnew, Gary, Grier, Andrew, Taimre, Thomas, Lim, Yah Leng, Ikonic, Zoran, Dean, Paul, Khanna, Suraj P., Lachab, Mohammad, Valavanis, Alexander, Cooper, Jonathan, Harrison, Paul, Linfield, Edmund H., Davies, A. Giles, Indjin, Dragan and Rakic, Aleksandar D. (2014). A QCL model with integrated thermal and stark rollover mechanisms. 2014 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD), Perth, Australia, 14-17 December 2014. Piscataway NJ United States: IEEE (Institute for Electrical and Electronic Engineers). doi: 10.1109/COMMAD.2014.7038649
Valavanis, A., Dean, P., Li, L., Burnett, A. D., Keeley, J., Chowdhury, S., Alhathlool, R., Chen, L., Zhu, J., Han, J., Freeman, J., Khanna, S. P., Indjin, D., Davies, A. G., Linfield, E. H., Taimre, T., Lim, Y. L., Bertling, K. and Rakic, A. (2014). High-power (> 1 Watt) terahertz frequency quantum cascade lasers for stand-off imaging. Sensors and Electronics Panel (SET) Specialists’ Meeting, Salisbury, United Kingdom, 24-25 July 2014. NATO Science and Technology Organization.
Roumy, Jalal Al, Perchoux, Julien, Lim, Yah Leng, Taimre, Thomas, Rakic, Aleksandar D. and Bosch, Thierry (2014). Effect of injection current on signal strength in a single-mode laser diode optical feedback interferometer subject to weak feedback. European Conference on Lasers and Electro-Optics, CLEO 2015, Munich,, 21-25 June 2015. OSA - The Optical Society.
Dean, P., Taimre, T., Lui, H. S., Bertling, K., Lim, Y. L., Valavanis, A., Keeley, J., Alhathlool, R., Chowdhury, S., Li, L. H., Khanna, S. P., Lachab, M., Indjin, D., Rakic, A. D., Linfield, E. H. and Davies, A. G. (2014). Coherent THz imaging using the self-mixing effect in quantum cascade lasers. Optical Sensors, Barcelona Spain, 27-31 July 2014. Washington, D.C.: Optical Society of American (OSA). doi: 10.1364/SENSORS.2014.SeTh4B.3
Rakić, Aleksandar, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Wilson, Stephen J., Nikolić, Milan, Valavanis, Alexander, Indjin, Dragan, Linfield, Edmund H., Davies, A. Giles, Ferguson, Blake, Walker, Graeme, Schaider, Helmut and Soyer, H. Peter (2014). THz QCL self-mixing interferometry for biomedical applications. SPIE Optical Engineering + Applications Conference 2014, San Diego, United States, 17-21 August 2014. Bellingham, WA, United States: S P I E - International Society for Optical Engineering. doi: 10.1117/12.2061433
Keeley, J. T., Dean, P., Valavanis, A., Bertling, K., Taimre, T., Lim, Y. L., Alhathlool, R., Chowdhury, S., Li, L. H., Indjin, D., Rakić, A., Linfield, E. H. and Davies, A. G. (2014). Electrical modulation schemes for imaging by self-mixing in terahertz quantum cascade lasers. IQCLSW 2014: 1st International Quantum Cascade Lasers School and Workshop, Policoro (Matera), Italy, 7-12 September, 2014.
Rakić, Aleksandar D., Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Dean, Paul, Keeley, James, Valavanis, Alex, Alhathlool, Raed, Khanna, Suraj P., Lachab, Mohammad, Indjin, Dragan, Ikonic, Zoran, Harrison, Paul, Linfield, Edmund H. and Davies, A. Giles (2013). Self-mixing effect in THz quantum cascade lasers: applications in sensing and imaging. ICP2013: 4th International Conference on Photonics, Melaka, Malaysia, 28-30 October, 2013. Piscataway, NJ, USA: IEEE. doi: 10.1109/ICP.2013.6687056
Dean, Paul, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Keeley, James, Valavanis, Alex, Alhathlool, Raed, Khanna, Suraj P., Lachab, Mohammad, Indjin, Dragan, Linfield, Edmund H., Davies, A. Giles and Rakić, Aleksandar (2013). Coherent imaging and sensing using the self-mixing effect in THz quantum cascade lasers. ITQW 2013: The 12th International Conference on Intersubband Transitions in Quantum Wells, Boston Landing, NY, USA, 16-20 September, 2013. Princeton, NJ, United States: Princeton University.
Bakar, A. A. A., Lim, Y. L., Wilson, S. J., Bertling, K., Fuentes, M. A. and Rakic, A. (2012). Optical electrocardiograph using self-mixing interferometer technique with a customized electro-optic phase modulator. Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 11-14 December 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/COMMAD.2012.6472373
Alhathlool, R., Dean, P., Valavanis, A., Lim, Y. L., Kliese, R., Nikolić, M., Khanna, S. P., Li, L. H., Indjin, D., Cunningham, J., Wilson, S. J., Rakić, A. D., Davies, A. G. and Linfield, E. H. (2012). Terahertz sensing and imaging through self-mixing in a quantum cascade laser. UK Semiconductors 2012, Shefield, United Kingdom, 4-5 July 2012.
Alhathlool, R., Dean, P., Valavanis, A., Lim, Y. L., Kliese, R., Nikolic, M., Khanna, S. P., Li, L. H., Indjin, D., Cunningham, J., Wilson, S. J., Rakic, A. D., Davies, A. G. and Linfield, E. H. (2012). Surface-profiling through self-mixing in a THz quantum cascade laser. International Quantum Cascade Lasers School and Workshop 2012 (IQCLSW 2012), Vienna, Austria, 2-6 September 2012. Vienna, Austria: GMe Gesellschaft für Mikro‐und Nanoelektronik.
Valavanis, A., Dean, P., Lim, Y. L., Alhathlool, R., Burnett, A. D., Chowdhurya, S., Kliese, R., Nikolić, M., Khanna, S. P., Lachab, M., Indjin, D., Wilson, S. J., Rakić, A. D., Davies, A. G. and Linfield, E. H. (2012). Detection of concealed weapons and characterisation of crystalline powders using terahertz quantum cascade lasers. UK Semiconductors 2012, Sheffield, United Kingdom, 4-5 July 2012.
Bakar, Ahmad Ashrif A., Lim, Yah Leng, Wilson, Stephen J., Fuentes, Miguel, Bertling, Karl, Bosch, Thierry and Rakic, Aleksandar D. (2012). Electrocardiographic signal detection using self-mixing interferometer technique with customized electro-optic phase modulator. ICP 2012 3rd International Conference on Photonics, Penang, Malaysia, 1-3 October 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/ICP.2012.6379524
Ross-Conley, F., Bertling, K., Lim, Y. L., Bradley, A. P. and Rakic, A. (2012). Profiling the change in refractive index using the self-mixing effect in lasers. 2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 12-14 December 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/COMMAD.2012.6472372
Gaynor, J. E., Lim, Y. L., Bertling, K. and Rakic, A. (2012). Towards a scanning laser confocal microscope using the self-mixing effect. 2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 12-14 December 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/COMMAD.2012.6472370
Kliese, Russell, Lim, Yah Leng, Bertling, Karl and Rakic, Aleksandar (2012). Self-mixing laser velocimetry: a realistic model. 2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 12-14 December 2012. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2012.6472371
Fok, E., Nikolic, M., Lim, Y. L., Bertling, K. and Rakic, A. (2012). Integrated optofluidic flow sensor using the self-mixing effect. 2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 12-14 December 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/COMMAD.2012.6472425
Lim, Y. L., Bertling, K., Dean, P., Valavanis, A., Alhathlool, R., Khanna, S. P., Indjin, D., Linfield, E. H., Davies, A. G., Wilson, S. J. and Rakic, A. (2012). Self-mixing signals in terahertz lasers. 2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD 2012), Melbourne, Australia, 12-14 December 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/COMMAD.2012.6472382
Dean, Paul, Valavanis, Alex, Khanna, Suraj P., Lachab, Mohammad, Indjin, Dragan, Ikonic, Zoran, Harrison, Paul, Linfield, Edmund H., Davies, A. Giles, Lim, Yah Leng, Kliese, Russell, Nikolic, Milan, Wilson, Stephen J. and Rakic, Aleksandar D. (2011). Terahertz sensing and imaging using a quantum cascade laser. 10th IEEE Conference on Sensors, Limerick, Ireland, 28-31 October 2011. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/ICSENS.2011.6127149
Nikolić, M., Lim, Y. L., Wilson, S. J., Rakić, A. D., Campagnolo, L., Perchoux, J. and Bosch, T. (2011). Flow profile measurement in micro-channels using changes in laser junction voltage due to Self-mixing effect. 10th IEEE Conference on Sensors, Limerick, Ireland, 28-31 October 2011. Piscataway, NJ, United States: IEEE. doi: 10.1109/ICSENS.2011.6127217
Lim, Yah Leng, Dean, Paul, Khanna, Suraj P., Lachab, Mohammad, Kliese, Russell, Nikolic, Milan, Indjin, Dragan, Harrison, Paul, Linfield, Edmund H., Davies, A. Giles and Rakic, Aleksandar D. (2010). Self-mixing interferometry with a Terahertz Quantum Cascade Laser: feedback induced voltage signal. 2010 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Canberra, ACT, Australia, 12-15 December, 2010. Piscataway, NJ, U.S.A.: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2010.5699686
Dean, Paul, Lim, Yah Leng, Khanna, Suraj P., Lachab, Mohammad, Kliese, Russell, Nikolic, Milan, Ikonic, Zoran, Indjin, Dragan, Harrison, Paul, Rakic, Aleksandar D., Linfield, Edmund H. and Davies, A. Giles (2010). Self-mixing sensor based on a terahertz quantum cascade laser. International Quantum Cascade Lasers School and Workshop 2010 (IQCLSW 2010), Florence, Italy, 30 August - 3 September 2010. Florence, Italy: University of Paris.
Nikolic, M., Lim, Y. L., Kliese, R., Bosch, T. and Rakic, A. D. (2010). Harmonic levels in self-mixing interferometry. 2010 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Canberra, ACT, Australia, 12-15 December, 2010. Piscataway, NJ, U.S.A.: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2010.5699788
Bakar, A. A. A., Flores, J. Z., Lim, Y. L., Kliese, Russell and Rakic, Aleksandar D. (2010). Self-mixing interferometer technique based on VCSEL under the effect of polarization mode switching. International Conference on Photonics (ICP 2010), Langkawi, Malaysia, 5-7 July 2010. Piscataway, N.J., U.S.: IEEE. doi: 10.1109/ICP.2010.5604438
Bakar, A. A. A., Bertling, K., Kliese, R., Lim, Y. L. and Rakic, A. D. (2010). Analysis of nanometer displacement measurement using the self-mixing technique based on VCSEL. 2010 International Conference On Nanoscience and Nanotechnology (ICONN), Sydney, NSW, Australia, 22-26 February 2010. Piscataway, NJ, United States: IEEE (Institute for Electrical and Electronic Engineers). doi: 10.1109/ICONN.2010.6045269
Matharu, Ranveer, Perchoux, Julien, Kliese, Russell, Lim, Yah Leng and Rakic, Aleksandar D. (2010). Thermal dependence of the signal to noise ratio of self-mixing sensors based on multimode VCSELs. 2010 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Canberra, ACT, Australia, 12-15 December 2010. Piscataway, NJ, U.S.A.: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2010.5699786
Kliese, Russell, Lim, Yah Leng, Stefan, Emmanuel, Perchoux, Julien, Wilson, Stephen J. and Rakic, Aleksandar D. (2010). Rapid Scanning Flow Sensor Based on the Self-mixing Effect in a VCSEL Laser. 2010 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Canberra, ACT, Australia, 12-15 December 2010. Piscataway, NJ, U.S.A.: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2010.5699789
Perchoux, Julien, Campagnolo, Lucie, Lim, Yah Leng and Rakic, Aleksandar D. (2010). “Lens-free” self-mixing sensor for velocity and vibrations measurements. 2010 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Canberra, ACT, Australia, 12-15 December, 2010. Piscataway, NJ, U.S.A.: Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/COMMAD.2010.5699770
Kliese, Russell, Lim, Yah Leng, Bosch, Thierry and Rakic, Aleksandar (2009). In vivo microvascular blood perfusion mapping using the slef-mixing effect in a proton-implanted VCSEL. 2nd International Conference on Physics of Optical Materials and Devices, Herceg Novi, Montenegro, 26 August - 31 September 2009. Belgrade, Serbia: Vinca Institute of Nuclear Sciences.
Lim, Yah Leng, Kliese, Russell, Bosch, Thierry and Rakic, Aleksandar (2009). Multi-channel self-mixing sensor for fluid-flow mapping based on a monolithic VCSEL array. 18th Internatinal Laser Physics Workshop (LPHYS'09), Barcelona, Spain, 13 - 17 July 2009.
Lim, Yah Leng, Kliese, Russell, Bertling, Karl, Tanimizu, Katsuyoshi, Jacobs, Peter A and Rakić, A. D. (2009). Parallel self-mixing flow sensor using monolithic VCSEL array. The 14th OptoElectronics and Communications Conference, Hong Kong, China, 13-17 July 2009. Piscataway, U.S.: IEEE. doi: 10.1109/OECC.2009.5215719
Matharu, Ranveer, Lim, Yah Leng, Kliese, Russell, Bertling, Karl, A. Bakar, A. Ashrif, Perchoux, Julien and Rakic, Aleksandar (2009). Temperature and current dependence of doppler SNR in a VCSEL based self-mixing sensor. The 8th Annual IEEE Conference on Sensors, Christchurch, New Zealand, 25 - 28 October, 2009. Piscatawa, NJ, U.S.A.: IEEE Sensors Council. doi: 10.1109/ICSENS.2009.5398259
A. Bakar, A. A., Taimre, T., Lim, Y. L., Bertling, K, Kliese, R. and Rakić, A. D. (2008). Linewidth measurement of vertical-cavity surface-emitting lasers under feedback using the self-mixing technique. 2008 International Conference on Electronics Materials, Sydney , Australia, 28 July - 1 August 2008.
Lim, Y.L., Bertling, K., Nikolic, M., Kliese, R, A. Bakar, A. Ashrif and Rakić, A.D. (2008). A parallel self-mixing sensor using 12-channel monolithic VCSEL array. 2008 International Conference on Nanoscience and Nanotechnology, Melbourne, Australia, 25-29 February, 2008.
A Bakar, A. A., Bertling, K, Kliese, R., Lim, Y. L., Rakić, A. D. and Taimre, T. (2008). Measuring VCSEL linewidth enhancement factor using the self-mixing technique. 2008 International Conference on Nanoscience and Nanotechnology, Melbourne, Australia, 25-29 February, 2008. New York, U.S.: IEEE.
Lim, Yah Leng, Kliese, Russell, Bertling, Karl and Rakić, A. D. (2008). Parallel self-mixing flow sensor using monolithic VCSEL array. 2008 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD 2008), Sydney, Australia, 28 July - 1 August, 2008. Piscataway, U.S.: IEEE. doi: 10.1109/COMMAD.2008.4802093
Kliese, Russell, Lim, Yah Leng, Bertling, Karl, Bakar, A. Ashrif A., Bosch, Thierry and Rakic, Aleksandar D. (2008). Self-mixing displacement sensing using the junction voltage variation in a GaN laser. 2008 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD 2008), Sydney, Australia, 28th July - 1st August, 2008. Piscataway, NJ, USA: IEEE. doi: 10.1109/COMMAD.2008.4802083
Tucker, J.R., Lim, Y.L., Bertling, K., Rakic, A.D. and Zvyagin, A.V. (2007). Fluid flow rate measurement using the change in laser junction voltage due to the self-mixing effect. 2006 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD 2006), Perth, WA, 6-8 December, 2006. Piscataway, NJ, USA: IEEE. doi: 10.1109/COMMAD.2006.4429913
Lim, Yah Leng, Tucker, John R. and Rakic, Aleksandar D. (2006). Distance measurement using the change in junction voltage across a laser diode due to the self-mixing effect. Northern Optics 2006, Bergen, Norway, 14-16 June, 2006. Piscataway, NJ, U.S.A.: IEEE. doi: 10.1109/NO.2006.348377
Lim, Yah Leng, Bertling, Karl, Rio, Pierre, Tucker, J. R. and Rakic, A. D. (2006). Displacement and Distance Measurement using the Change in Junction Voltage Across a Laser Diode Due to the Self-Mixing Effect. SPIE International Symposium on Microelectronics, MEMS, and Nanotechnology, Brisbane, Australia, 12-15 December, 2005. Washington, USA: SPIE - International Society for Optical Engineering. doi: 10.1117/12.638433
Tucker, John R., Lim, Yah Leng, Zvyagin, Andrei V. and Rakic, Aleksandar D. (2006). A Massively Parallel Imaging System Based on the Self-Mixing Effect in a Vertical-Cavity Surface-Emitting Laser Array. Northern Optics 2006, Hotel Norge, Bergen, Norway, 14-16 June, 2006. USA: IEEE. doi: 10.1109/NO.2006.348370
Tucker, John R., Lim, Yah Leng and Rakic, Aleksandar D. (2003). Laser range finding using the self-mixing effect in a vertical-cavity surface-emitting laser. 2002 Conference on Optoelectronic and Microelectronic Materials and Devices, The University of New South Wales, Sydney, Australia, 11-13 December, 2002. Piscataway, NJ: The Institute of Electrical and Electronics Engineers. doi: 10.1109/COMMAD.2002.1237319
Patent
Rakic, Aleksandar, Dean, Paul , Giles Davies, Alexander , Indjin, Dragan , Linfield, Edmund Harold , Wilson, Stephen J., Taimre, Thomas , Bertling, Karl and Lim, Yah Leng (2014). A laser system for imaging and materials analysis. WO2015024058 A1.
Thesis
Yah Leng Lim (2011). Self-mixing sensors based on monolithic VCSEL arrays: A new approach to imaging. PhD Thesis, School of Information Technology and Electrical Engineering, The University of Queensland.