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Dr. LEE En-yuan Joshua (李恩源博士)

BA, MEng, MA, PhD (Cantab)
SMIEEE

Associate Professor

Contact Information

Office: G6351 AC1
Phone: 3442 9897
Email: josh.lee@cityu.edu.hk
Web: Research Homepage

Research Interests

  • Microelectromechanical Systems (MEMS)
  • Micromechanical Resonators
  • Micromechanical Sensors
  • Piezoelectric Devices
Dr. Joshua Lee received the BA and MEng (Distinction) degrees in 2005 and the PhD degree in 2009; all from the University of Cambridge where he was a member of St. John's College Cambridge. During his PhD, he was affiliated with the Nanoscience Centre and the Department of Engineering at the University of Cambridge. He joined the faculty of City University of Hong Kong in June 2009 as an Assistant Professor in the Department of Electronic Engineering. He is currently an Associate Professor and is affiliated with the State Key Laboratory of Millimeter Waves; the first laboratory of its kind in the engineering discipline in Hong Kong.

His research interest lies in the area of Micro Electro Mechanical Systems (MEMS), looking into various aspects concerning their design, computational and analytical modeling, fabrication and electrical characterization, as well as studying issues arising from interfacing MEMS with circuits. He is a Senior Member of IEEE. He also serves as an active reviewer for a number of international journals on the topic of MEMS. He was awarded a Research Student Development Fellowship (1 of 4) by the Royal Academy of Engineering in Jan 2008. Two of his PhD students received two of six Student Awards at the 2014 European Frequency and Time Forum, while another was awarded the CSE Student Research Excellence Award in 2014.


Awards and Achievements

  • 2019 “2018/19 Outstanding Teacher Award” Department of Electrical Engineering.
  • 2018 “2018/2019 Outstanding Supervisor Award” City University of Hong Kong.
  • 2017 “2017/2018 Outstanding Supervisor Award” City University of Hong Kong.
  • Jun 2015 “Outstanding Teacher Award 2014/15 (Level 2 Course, 1st Prize)” Dept. of Electronic Engineering.
  • Jun 2015 “Outstanding Teacher Award 2014/15 (GE/Level 1 Course, 2nd Prize)” Dept. of Electronic Engineering.
  • Jun 2014 “Student Paper Award (Technical Groups 1 and 4)” 28th European Frequency and Time Forum (EFTF2014). A total of 6 awards were presented to student presenters, 2 of which were given to students supervised by Dr Lee. [URL]
  • Jun 2014 “Outstanding Teacher Award 2013/14 (Level 2 Course, 2nd Prize)” Dept. of Electronic Engineering.
  • Jun 2013 “Outstanding Teacher Award 2012/13 (GE/Level 1 Course, First Prize)” Dept. of Electronic Engineering.
  • Jan 2008 “Research Student Development Fellowship” Royal Academy of Engineering.
  • Jul 2005 “Hockin Prize” St. John's College, Cambridge.
  • Jul 2005 “Cargil Prize” St. John's College, Cambridge.
  • Jul 2005 “Townsend Scholar” St. John's College, Cambridge.
  • Apr 2004 “Shell Prize” Dept. of Engineering, Cambridge University.


Research Grants

  • VHF Piezoelectric Aluminum Nitride on Silicon Lamb Wave Mode Micromechanical Lorentz Force Magnetometers, General Research Fund 2016/17, RGC, 1 Jan 2017 - 31 Dec 2019, Joshua Lee (PI).
  • Hybridizing Phononic Crystals and Laterally Vibrating MEMS Contour Mode Resonators in Piezoelectric Aluminum Nitride on Silicon-on-Insulator Technology, General Research Fund 2015/16, RGC, 1 Jan 2016 - 31 Dec 2018, Joshua Lee (PI).
  • Exploiting Thickness Shear Mode Acoustic Resonance in Piezoelectric-on-Si Unreleased Micromechanical Resonators for Gravimetric Biosensing in Fluid-Damped Media, General Research Fund 2014/15, RGC, 1 Jan 2015 - 31 Dec 2017, Joshua Lee (PI), Raymond Lam (Co-I).
  • Novel Approaches to Performance Breakthroughs in Piezoelectric Aluminium Nitride (AlN)-based Micromechanical Contour Mode Resonators (CMRs) for Radio-frequency Applications, Germany/Hong Kong Joint Research Scheme, RGC/DAAD, 1 Jan 2015 - 31 Dec 2016, Joshua Lee (Hong Kong PI), Matthias Hein (German PI).
  • Contour Mode Acoustic Resonance in Silicon-on-Insulator Mechanical Resonators using Internal Depletion Layer Transducers, General Research Fund 2013/14, RGC, 1 Jan 2014 - 31 Dec 2016, Joshua Lee (PI), Man Wong (Co-I).


Publications Show All Publications Show Prominent Publications


Journal

  • Zhang, W. & Lee, J E-Y. (Oct 2013). A horseshoe micromachined resonant magnetic field sensor with high quality factor. IEEE Electron Device Lett. 34. 1310 - 1312. doi:10.1109/LED.2013.2278031
  • Tu, C. & Lee, J E-Y. (Apr 2013). Crystallographic effects on energy dissipation in high-Q silicon bulk mode resonators. J. Microelectromech. Syst. 22. 262 - 264. doi:10.1109/JMEMS.2013.2239259
  • Xu, Y. & Lee, J E-Y. (Dec 2012). Single-device and on-chip feedthrough cancellation for hybrid MEMS resonators. IEEE Trans. Ind. Electron. 59. 4930 - 4937. doi:10.1109/TIE.2011.2180274
  • Zhu, H. & Lee, J E-Y. (Oct 2012). Reversed nonlinear oscillations in Lamé-mode single crystal silicon microresonators. IEEE Electron Device Lett. 33. 1492 - 1494. doi:10.1109/LED.2012.2210021
  • Tu, C. & Lee, J E-Y. (Mar 2012). Increased dissipation from distributed etch holes in a lateral breathing mode silicon micromechanical resonator. Appl Phys Lett. 101. 023504 doi:10.1063/1.4733728
  • Lee, J E-Y. & Seshia, A A. (Jun 2011). Direct parameter extraction in feedthrough-embedded capacitive MEMS resonators. Sens. Actuator A-Phys. 167. 237 - 244. doi:10.1016/j.sna.2011.02.016
  • Lin, T-H A. , Lee, J E-Y. , Yan, J. & Seshia, A A. (Mar 2010). Methods for enhanced electrical transduction and characterization of micromechanical resonators. Sens. Actuator A-Phys. 158. 263 - 272. doi:10.1016/j.sna.2010.01.024
  • Lee, J. , Yan, J. & Seshia, A A. (Jul 2009). Low loss HF band SOI wine glass bulk mode capacitive square-plate resonator. J. Micromech. Microeng. 19. 074003 doi:10.1088/0960-1317/19/7/074003
  • Lee, J E-Y. , Zhu, Y. & Seshia, A A. (Jun 2008). A bulk acoustic mode single-crystal silicon microresonator with a high-quality factor. J Micromech Microeng. 18. 064001 doi:10.1088/0960-1317/18/6/064001
  • Lee, J E-Y. , Bahreyni, B. , Zhu, Y. & Seshia, A A. (Dec 2007). Ultrasensitive mass balanced based on a bulk acoustic mode single-crystal silicon resonator. Appl. Phys. Lett. 19. 234103 doi:10.1063/1.2822405

Conference Paper

  • Zhu, H. , Tu, C. & Lee, J E-Y. (Jan 2016). High-Q low impedance UHF-band AlN-on-Si MEMS resonators using quasi-symmetrical lamb wave modes. 29th IEEE Int. Conf. on Micro Electro Mechanical Systems (IEEE MEMS 2016). (pp. 970 - 973). Shanghai. China: doi:10.1109/MEMSYS.2016.7421794
  • Tu, C. , Guo, X. & Lee, J E-Y. (Jun 2015). Modal analysis of out-of-plane vibrations in switchable piezoelectric gallium nitride micromechanical resonators. 18th Int. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2015). (pp. 1977 - 1980). Anchorage. AK: doi:10.1109/TRANSDUCERS.2015.7181341
  • Di, X. & Lee, J E-Y. (Jun 2015). Reducing anchor loss in piezoelectric-on-silicon laterally vibrating resonators by combination of etched-slots and convex edges. 18th Int. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2015). (pp. 2033 - 2036). Anchorage. AK: doi:10.1109/TRANSDUCERS.2015.7181355
  • Zhu, H. & Lee, J E-Y. (Jan 2015). AlN piezoelectric on silicon MEMS resonator with boosted Q using planar patterned phononic crystals on anchors. 28th IEEE Int. Conf. on Micro Electro Mechanical Systems (IEEE MEMS 2015). (pp. 797 - 800). Estoril. Portugal: doi:10.1109/MEMSYS.2015.7051079
  • Zhu, H. , Tu, C. , Rufer, L. & Lee, J E-Y. (Nov 2014). Active electronic cancellation of nonlinearity in a high-Q longitudinal-mode silicon resonator by current biasing. 28th European Frequency and Time Forum (EFTF 2014). (pp. 12 - 15). Neuchatel. Switzerland: .
  • Zhang, W. & Lee, J E-Y. (Nov 2014). Electromagnetic induction readout silicon-on-insulator MEMS resonant magnetometer. 28th European Frequency and Time Forum (EFTF 2014). (pp. 24 - 27). Neuchatel. Switzerland: .
  • Tu, C. & Lee, J E-Y. (Jan 2014). Etch-hole-assisted energy dispersion for enhancing quality factor in silicon bulk acoustic resonators. 27th IEEE Int. Conf. on Micro Electro Mechanical Systems (IEEE MEMS 2014). (pp. 1257 - 1260). San Francisco. CA: doi:10.1109/MEMSYS.2014.6765877
  • Zhang, W. & Lee, J E-Y. (Jun 2013). Characterization and model validation of a micromechanical resonant magnetic field sensor. 17th Int. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2013 / Eurosensors XXVII). (pp. 1859 - 1862). Barcelona. Spain: doi:10.1109/Transducers.2013.6627153
  • Iqbal, A. , Zhang, W. & Lee, J E-Y. (Jun 2013). Enhanced piezoresistive sensing via synchronized oscillations in a mechanically coupled disk array. 17th Int. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2013 / Eurosensors XXVII). (pp. 1384 - 1387). Barcelona. Spain: doi:10.1109/Transducers.2013.6627036
  • Zhu, H. , Chuang, C-H. , Li, C-S. , Li, M-H. , Lee, J E-Y. & Li, S-S. (Jun 2013). The effects of tight capacitive coupling on phase noise performance: a Lamé-mode MEMS oscillator study. 17th Int. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2013 / Eurosensors XXVII). (pp. 2304 - 2307). Barcelona. Spain: doi:10.1109/Transducers.2013.6627266
  • Zhu, H. , Shan, G. , Tu, C. & Lee, J E-Y. (Jan 2013). Crystallographic and eigenmode dependence of TCf for single crystal silicon contour mode resonators. 26th IEEE Int. Conf. on Micro Electro Mechanical Systems (IEEE MEMS 2013). (pp. 761 - 764). Taipei. Taiwan: doi:10.1109/MEMSYS.2013.6474354
  • Zhu, H. , Tu, C. & Lee, J E-Y. (Jan 2013). Electronic tuning of Q and apparent TCf in a piezoresistive micromechanical resonator. 26th IEEE Int. Conf. on Micro Electro Mechanical Systems (IEEE MEMS 2013). (pp. 757 - 760). Taipei. Taiwan: doi:10.1109/MEMSYS.2013.6474353
  • Xu, Y. & Lee, J E-Y. (Jun 2011). Differential-input piezoresistively-sensed square-extensional mode resonator for parasitic feedthrough cancellation. 16th In. Conf. on Solid-State Sensors, Actuators and Microsystems (Transducers 2011). (pp. 2474 - 2477). Beijing. China: doi:10.1109/TRANSDUCERS.2011.5969696


Service in CityU


Administrative Assignment

  • 2017 - 2019, Sub-committee for Research Degrees (CSE/CENG), Deputy Chair.
  • Jul 2016 - Jun 2020, Research Degree Programmes, Programme Leader.
  • Oct 2015 - Aug 2016, Concord (EE newsletter), Editor.
  • Apr 2015 - Jun 2016, Research Degree Programmes, Deputy Programme Leader.
  • Sep 2013 - Jul 2016, ECE Major Programme Management Team, Year 3 Academic Tutor.
  • Sep 2013 - Jun 2020, Electronic Circuits & Projects Laboratory, Director.
  • Sep 2010 - Aug 2013, ECE Programme Management Team, Year 1 Academic Tutor.


Last update date : 20 Sep 2020