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Gayathri Pillai

Research Interests

  • Piezoelectric MEMS Transducer Hub
  • 5G Communication
  • Piezo/Ferroelectric material exploration for MEMS devices
  • Plasmonics and Metasurfaces for MEMS
  • MEMS Resonators for Quantum Communications
  • Photon-Phonon Interaction Study

Publications

  • G. Pillai, and S.-S. Li, " Exploration and Realization of Novel High-Q Bulk Modes Using Support Transducer Topology,” IEEE/ASME J. Microelectromech. Syst. (JMEMS) Accepted for Publication.
  • G. Pillai, and S.-S. Li, "Controllable Multichannel Acousto-Optic Modulator and Frequency Synthesizer Enabled by Nonlinear MEMS Resonator," Scientific reports, vol. 11, no. 1, pp. 1-13, 2021.
  • G. Pillai, and S.-S. Li, “Quality Factor Boosting of Bulk Acoustic Wave TPoS Resonators Using Based on a Two Dimensional Array of High-Q Resonant Tanks,” Applied Physics Letters, vol. 116, no. 16, April 2020.
  • G. Pillai, and S.-S. Li, "Piezoelectric MEMS Resonators: A Review," IEEE Sensors Journal (Invited Paper), Nov. 2020.
  • G. Pillai, A. A. Zope, and S.-S. Li, “Piezoelectric based support transducer design to enable high performance bulk mode resonators,” IEEE/ASME J. Microelectromech. Syst. (JMEMS), vol. 28, no. 1, pp. 4-19, Feb. 2019.
  • G. Pillai, A. A. Zope, J. M.-L. Tsai, and S.-S. Li, “Design and Optimization of SHF Composite FBAR Resonators,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control (T-UFFC), vol. 64, no. 12, pp. 1864-1873, Dec. 2017
  • J. Satija, S. Dey, S. Bhattacharya, G. Pillai, and S.-S. Li, "A Chip-Scale Frequency Down-Conversion Realized by MEMS-Based Filter and Local Oscillator," Sensors and Actuators A: Physical, p. 111787, 2019.
  • M.-H. Li, W. Chiu, C. Chou, G. Pillai, and S.-S. Li, “Conceptual Design of a Resonant Pirani Gauge (RPG) Towards Wide Range Pressure Sensing,” IEEE Sensors Letters, Oct. 2019.
  • C.-H. Weng, G. Pillai, and S.-S. Li, “A Thin-Film Piezoelectric-on-Silicon MEMS Oscillators for Mass Sensing Applications,” IEEE Sensors Journal, March 2020.
  • C.-H. Weng, G. Pillai, and S.-S. Li, “A PM2.5 Sensor Module Based on a TPoS MEMS Oscillator and an Aerosol Impactor,” IEEE Sensors Journal, July 2020.
  • H.-T. Jen, G. Pillai, S.-I. Liu, and S.-S. Li, "High-Q Support Transducer MEMS Resonators Enabled Low Phase Noise Oscillators," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 68, no. 4, pp. 1387-1398, 2020.

Patents

  • S.-S. Li, and G. Pillai, “Resonator and Resonator Array”. US Patent 20190229701 A1 and Taiwan Patent TWI659553B
  • S.-S. Li, and G. Pillai, “Higher harmonics generation enabled by electromechanical nonlinearity”. (US 16/578422 and Taiwan TWI711273B).
  • S.-S. Li, H. G. Ranjith, G. Pillai, and C.-H. Weng, “Acceleration Sensing Structure and Accelerometer”. (US and Taiwan), Filed 2020.

Conference and Seminars

  • G. Pillai, M.-F. Lai, and S.-S. Li, "A fully differential thin film piezo on silicon flexural mode ring resonator with exceptional quality factor,” Proceedings, 20th Int. Conf. on Solid-State Sensors & Actuators (Transducers’19), Berlin, Germany, June 23-27, 2019, pp. 889-892.
  • G. Pillai, C.-Y. Chen, and S.-S. Li, "Support transducer enabled single-resonator channel-select filters,” Proceedings, 2019 Joint Conference of the IEEE International Frequency Control Symposium & European Frequency and Time Forum, Orlando, Florida, April 14-18, 2019, pp. 1-2.
  • G. Pillai, A. A. Zope, and S.-S. Li, "Piezoelectrically transduced Lamé-mode resonators and oscillators,” Proceedings, 2018 IEEE Frequency Control Symposium, Olympic Valley, CA, May 21-24, 2018, pp. 324-325.
  • G. Pillai, A. A. Zope, and S.-S. Li, "A novel transducer design to enable high-performance piezoelectric MEMS resonators and oscillators,” Proceedings, 31st IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’18), Belfast, Northern Ireland, Jan. 21-25, 2018, pp. 166-169.
  • G. Pillai, A. A. Zope, J. M.-L. Tsai, and S.-S. Li, "An apodized 3-GHz thin film piezoelectric on substrate FBAR,” Proceedings, 2017 European Frequency and Time Forum & International Frequency Control Symposium (EFTF-IFCS’17), Besançon, France, July 10-13, 2017, pp. 551-553.
  • G. Pillai, A.-A. Zope, J. M.-L. Tsai, and S.-S. Li, "3-GHz BAW composite resonators integrated with CMOS in a single-chip configuration,” Proceedings, 2016 IEEE Int. Frequency Control Symp., New Orleans, LA, May 9-12, 2016.
  • G. Pillai, W.-S. Tan, C.-C. Chen, and S.-S. Li, "Modeling of zero TCF and maximum bandwidth orientation for lithium tantalate RF MEMS resonators,” Proceedings, 11th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE-NEMS 2016), Japan, 17-20 April.
  • C.-H. Weng, G. Pillai, and S. -S. Li, “A Miniaturized Aerosol Sensor Module Based on a Piezoelectric MEMS Oscillator” ISAF-EFTF 2021 (Accepted).
  • C.-H. Weng, G. Pillai, and S. -S. Li, “A Mass Sensor Based On An Aln Mems Oscillator For Gas Sensing Application” Transducers 2021 (Accepted).
  • N. M. Nguyen, C.-Y. Chang, G. Pillai, and S.-S. Li, "Design of piezoelectric MEMS bulk acoustic wave mode-matched gyroscopes based on support transducer,” (oral presentation) in the 34th IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’21), Jan. 25-29, 2021.
  • H. -T. Jen, G. Pillai, S. L. Liu, and S. S. Li, "Low phase noise wine-glass oscillator realized using enhanced support transducer design,” Proceedings, the 2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF), Keystone, CO, USA, Jul. 19-23, 2020, pp. 1-3. (STUDENT PAPER FINALIST)
  • K. Bhosale, G. Pillai, and S. -S. Li, "Nonlinearity driven higher order harmonics in CMOS-MEMS resonators,” Proceedings, Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF), Keystone, CO, USA, Jul. 19-23, 2020, pp. 1-3.
  • C.-Y. Liu, G. Pillai, and S.-S. Li, "Exploring the parametric energy transfer in a multi-mode piezoelectric resonator with nonlinear harmonics,” to be presented in 33rd IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’20), Vancouver, Canada, Jan. 18-22, 2020. (STUDENT PAPER FINALIST)
  • G. Fang, G. Pillai, M.-H. Li, C.-Y. Liu, and S.-S. Li, "A VHF temperature compensated lithium niobateon-oxide resonator with Q > 3900 for low phase noise oscillators,” Proceedings, 31st IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’18), Belfast, Northern Ireland, Jan. 21-25, 2018, pp. 723-726.
  • T.-Y. Liu, C.-A. Sung, C.-H. Weng, C.-C. Chu, A. A. Zope, G. Pillai, and S.-S. Li, "Gated CMOS-MEMS thermal-piezoresistive oscillator-based PM2.5 sensor with enhanced particle collection efficiency,” Proceedings, 31st IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’18), Belfast, Northern Ireland, Jan. 21-25, 2018, pp. 75-78.
  • C. Y. Chen, M. H. Li, G. Pillai, J. M. L. Tsai and S. S. Li, "An innovative piezo-MEMS channel-select filter design based on non-monotonic coupled modes,” Proceedings, 30th IEEE Int. Micro Electro Mechanical Systems Conf. (MEMS’17), Las Vegas, NV, Jan. 22-26, 2017, pp. 950-953.
  • W.-S. Tan, W. G. Fang, G. Pillai, C.-C. Chen, C.-Y. Chen, C.-H. Chin, and S.-S. Li, "Fabrication and characterization of lithium-niobate thin film MEMS piezoelectric resonators,” Proceedings, 11th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE-NEMS 2016), Matsushima Bay and Sendai MEMS City, Japan, 17-20 April.

Conference /Workshop papers presented but not published

  • G. Pillai and S.-S. Li, “Frequency Matched Bulk Mode Piezoelectric Transducer to Excite High-Q Phononic Crystal Lattice”, International Conference on Smart Sensors 2020, Taiwan [Best Oral Presentation Award].
  • G. Pillai and S.-S. Li, “Novel Thin Film Piezoelectric-on-Substrate MEMS Devices for RF Application”, NAMIS Workshop, Organized by VTT Oulu and CNRS France, IIT Bombay, India, November 2019.
  • G. Pillai, C.Y.Chen, and S.-S. Li, " Support Transducer Enabled Single-Resonator Channel-Select Filters,” International Conference on Smart Sensors (June 2019, Taiwan. [Honorary Oral Presentation Award]
  • G. Pillai and S.-S. Li, “Support transducer design to enable piezoelectrically transduced Lamé-mode resonator and oscillator, “International Conference on Smart Sensors (June 2018), Taiwan