Recent Publications

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2024

  1. X. Niu, Z. Liu, V. Chulukhadze, L. Matteo, Y. Wang, N. Ravi, E. Kwon, M. S. Goorsky, R. Lu, and N. Hall, “Bi-Layer Lithium Niobate Diaphragms for High-Temperature Pressure Transducers,” GOMACTech 2025.
  2. M. S. Goorsky, S. Chowdhury, N. Hall, and R. Lu, “Integrated Sensors at High-Temperature Using Transferred Piezoelectric Transducers and Epitaxial Transistors (IGNITE),” GOMACTech 2025.
  3. J. Kramer, V.Chulukhadze, L.Matto, K. Huynh, O. Barrera, S. Cho, M. Liao, M. S. Goorsky, and R. Lu, “Millimeter-Wave Miniaturized Resonators and Filters in Piezoelectric Thin-Film Lithium Niobate,” GOMACTech 2025.
  4. Z.-Q. Lee, S.-Y. Huang, T.-H. Hsu, J. Campbell, J. Kramer, R. Lu, and M.-H. Li, “6 GHz lithium niobate on insulator low-loss SAW delay line adapting non-leaky composite waveguide mode,” in Proc., the 38th IEEE Micro Electro Mechanical Systems (MEMS’25), Kaohsiung, Taiwan, Jan. 19-23, 2025.
  5. S.-Y. Huang, Z.-Q. Lee, T.-H. Hsu, J. Campbell, J. Kramer, R. Lu, and M.-H. Li, “A 4.3 GHz lithium niobate on insulator wideband surface acoustic wave delay line with multi-mode composition,” in Proc., the 38th IEEE Micro Electro Mechanical Systems (MEMS’25), Kaohsiung, Taiwan, Jan. 19-23, 2025.
  6. V. Chulukhadze, X. Niu, L. Matto, Y. Wang, Z. Liu, E. Stolt, M. S. Goorsky, N. Hall, and R. Lu, “Lateral Field Excited Lithium Niobate for High Bandwidth Transducers“, TRF Topical Workshop on Hybrid and Heterogenous Microsystem 2024
  7. Y. Wang, O. Barrera, N. Ravi, K. Saha, S. Dasgupta, E. Kwon, S. Cho, L. Matto, P. Simeoni, J. Hou, M. Rinaldi, M. S. Goorsky, and R. Lu, “Solidly Mounted Resonator Platform Using ScAlN on Bottom Electrode on Bragg Reflector“, TRF Topical Workshop on Hybrid and Heterogenous Microsystem 2024
  8. Y. Yu, R. Yin, C. Lee, X. Ren, I. Anderson, J. Kramer, R. Lu, and M. Yu, “Room-temperature optomechanical-resonator-based sensor on thin film lithium niobate“, TRF Topical Workshop on Hybrid and Heterogenous Microsystem 2024
  9. O. Barrera, N. Ravi, K. Saha, S. Dasgupta, J. Campbell, J. Kramer, E. Kwon, T.-H. Hsu, S. Cho, I. Anderson, P. Simeoni, J. Hou, M. Rinaldi, M. S. Goorsky, and R. Lu, “18 GHz Solidly Mounted Resonator in Scandium Aluminum Nitride on SiO2/Ta2O5 Bragg Reflector“, IEEE JMEMS, 2024
  10. V. Chulukhadze, E. Stolt, J. Rivas, and R. Lu, “Lithium Niobate Resonators for Piezoelectric Power Conversion: Spurious Mode Suppression via an Active Ring“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  11. J. Kramer, O. Barrera, B. Bosworth, N. Jungwirth, L. Matto, S. Cho, N. Orloff, M. Goorsky, and R. Lu, “Piezoelectric Acoustics Exceeding 100 GHz“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  12. O. Barrera, S. Cho, J. Kramer, V. Chulukhadze, T.-H. Hsu, J. Campbell, I. Anderson, and R. Lu, “19.3 GHz Acoustic Filter with 2.2 dB IL, 8.5% FBW, and 47 dB Close-in Rejection in Trilayer Periodically Poled Piezoelectric Thin-Film Lithium Niobate“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  13. J. Campbell, I. Anderson, T.-H. Hsu, O. Barrera, J. Kramer, S. Cho, V. Chulukhadze, G. Latham, M.-H. Li, and R. Lu, “21.4 GHz Surface Acoustic Wave Resonator with 11,400 m/s Phase Velocity in Thin-Film Lithium Niobate on Silicon Carbide“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  14. T.-H. Hsu, J. Campbell, J. Kramer, S. Cho, Z.-Q. Lee, M.-H. Li, and R. Lu, “22.4 GHz Longitudinal SAW Resonator with k2 of 3.4% and Q of 192“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  15. I. Anderson, T.-H. Hsu, V. Chulukhadze, J. Kramer, S. Cho, O. Barrera, J. Campbell, M.-H. Li, and R. Lu, “Low-Loss Higher-Order Cross-Sectional Lamé Mode SAW Devices in 10-20 GHz“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  16. V. Chulukhadze, J. Kramer, O. Barrera, N. Ahmed, I. Anderson, J. Campbell, S. Cho, and R. Lu, “High Figure of Merit A3 Mode Lithium Niobate Acoustic Resonators from 30 to 60 GHz“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  17. S. Cho, O. Barrera, H. Bansal, M. Liao, E.-Y. Wang, V. Chulukhadze, J. Kramer, J. Campbell, T.-H. Hsu, I. Anderson, M. S. Goorsky, and R. Lu, “13 GHz Acoustic Resonator with Q of 600 in High-Quality Thin-Film Aluminum Nitride“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024
  18. R. Lu, “Scaling of Acoustic Resonators Into Millimeter Wave Regime Using Piezoelectric Thin Films“, IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 2024 (Invited Talk)
  19. T. Zhang, Y.-W. Chang, O. Barrera, N. Ahmed, J. Kramer, and R. Lu, “Acoustic and Electromagnetic Co-Modeling of Piezoelectric Devices at Millimeter Wave“, IEEE JMEMS, 2024
  20. C. Daniel, E. Stolt, W. Braun, R. Lu and J. Rivas-Davila, “Nonlinear Losses and Material Limits of Piezoelectric Resonators for DC-DC Converters,” 2024 IEEE Applied Power Electronics Conference and Exposition (APEC), Long Beach, CA, USA, 2024, pp. 1560-1565
  21. Z.-Q. Lee, T.-H. Hsu, Y.-C. Yu, C.-C. Lin, Y.-C. Liao , S. Cho, R. Lu, and M.-H. Li, “Spectrum-Clean Dispersion-Engineered YX-LN/SiO2/Si Wideband SH-SAW Resonators With Crossed Interdigital Transducers“, in IEEE Transactions on Electron Devices, 2024
  22. V. Chulukhadze, J. Kramer, T.-H. Hsu, O. Barrera, I. Anderson, S. Cho, J. Campbell, and R. Lu, “2 to 16 Ghz Fundamental Symmetric Mode Acoustic Resonators In Piezoelectric Thin-Film Lithium Niobate“, in Hilton Head Workshop 2024 (Best Student Poster Award)
  23. J. Kramer, T.-H. Hsu, J. Campbell, and R. Lu, “Ultra-Wideband Tapered Transducers In Thin-Film Lithium Niobate On Silicon Carbide“, in Hilton Head Workshop 2024
  24. T.-H. Hsu, J. Campbell, J. Kramer, S. Cho, M.-H. Li, and R. Lu, “C-Band Lithium Niobate on Silicon Carbide Surface Acoustic Wave Resonator with Figure-of-Merit of 124 at 6.5 GHz“, IEEE JMEMS, 2024
  25. T.-H. Hsu, J. Campbell, J. Kramer, S. Cho, Z.-Q. Lee, M.-H. Li, R. Lu, “Thin-film Lithium Niobate on Insulator Surface Acoustic Wave Devices for 6G Centimeter Bands“, IEEE International Conference on Microwave Acoustics & Mechanics (IC-MAM), 2024
  26. S. Cho, O. Barrera, J. Kramer, V. Chulukhadze, T.-H. Hsu, J. Campbell, I. Anderson, and R. Lu, “23.8 GHz Acoustic Filter in Periodically Poled Piezoelectric Film Lithium Niobate with 1.52 dB IL and 19.4% FBW,“ IEEE Microwave and Wireless Technology Letters, 2024.
  27. J. Kramer, O. Barrera, S. Cho, V. Chulukhadze, T.-H. Hsu, and R. Lu, “Experimental Study of Periodically Poled Piezoelectric Film Lithium Niobate Resonator at Cryogenic Temperatures,“ IEEE International Microwave Symposium (IMS), June 2024.
  28. S. Cho, O. Barrera, J. Kramer, V. Chulukhadze, T.-H. Hsu, J. Campbell, I. Anderson, and R. Lu, “23.8 GHz Acoustic Filter in Periodically Poled Piezoelectric Film Lithium Niobate with 1.52 dB IL and 19.4% FBW,“ IEEE International Microwave Symposium (IMS), June 2024. (Third Place Best Student Paper Award)
  29. W. D. Braun, E. Stolt, K. Nguyen, J. Segovia-Fernandez, S. Chakraborty, R. Lu, and J. Rivas-Davila, “A Stacked Piezoelectric Converter Using a Segmented IDT Lithium Niobate Resonator,” in IEEE Open Journal of Power Electronics
  30. J. Kramer, V.Chulukhadze, L.Matto, K. Huynh, O. Barrera, S. Cho, M. Liao, M. S. Goorsky, and R. Lu, “Thin-Film Lithium Niobate as Compact Acoustic Resonator and Filter Platforms at Millimeter Wave,” GOMACTech 2024.
  31. O. Barrera, S. Cho, J. Kramer, V. Chulukhadze, J. Campbell, and R. Lu “38.7 GHz Thin Film Lithium Niobate Acoustic Filter“, IEEE International Microwave Filter Workshop (IMFW), 2024
  32. S. Cho, O. Barrera, P. Simeoni, E. Wang, J. Kramer, V. Chulukhadze, M. Rinaldi, and R. Lu, “Millimeter Wave Thin-Film Bulk Acoustic Resonator in Sputtered Scandium Aluminum Nitride Using Platinum Electrodes,” IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2024 (Best Student Poster Award Finalist)
  33. T.-H. Hsu, Z.-Q. Lee, C.-H. Tsai, V. Chulukhadze, C.-C. Lin, Y.-C. Yu, R. Lu, and M.-H. Li, “A dispersion-engineered YX-LN/SiO2/Sapphire SH-SAW resonator for enhanced electromechanical coupling and rayleigh mode suppression,” IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2024. (Best Student Poster Award Finalist)
  34. O. Barrera, S. Cho, K. Hyunh, J. Kramer, M. Liao, V. Chulukhadze, L. Matto, M. S. Goorsky, and R. Lu, “Transferred Thin Film Lithium Niobate as Millimeter Wave Acoustic Filter Platforms“, IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2024 (Best Student Poster Award Finalist)

2023

  1. E. Stolt, W. Braun, K. Nguyen, V. Chulukhadze, R. Lu, and J. Rivas-Davila, “A Spurious-Free Piezoelectric Resonator Based 3.2 kW DC-DC Converter for EV On-Board Chargers,” in IEEE Transactions on Power Electronics.
  2. S. Cho, O. Barrera, P. Simeoni, E. N. Marshall, J. Kramer, K. Motoki, T.-H. Hsu, V. Chulukhadze, M. Rinaldi, W.A. Doolittle, and R. Lu, “Millimeter Wave Thin-Film Bulk Acoustic Resonator in Sputtered Scandium Aluminum Nitride,” in Journal of Microelectromechanical Systems, doi: 10.1109/JMEMS.2023.3321284.
  3. O. Barrera, S. Cho, L. Matto, J. Kramer, K. Huynh, V. Chulukhadze, Y.-W. Chang, M. S. Goorsky, and R. Lu, “Thin-Film Lithium Niobate Acoustic Filter at 23.5 GHz With 2.38 dB IL and 18.2% FBW,” in Journal of Microelectromechanical Systems, doi: 10.1109/JMEMS.2023.3314666.
  4. K.Nguyen, V. Chulukhadze, E. Stolt, W. Braun, J. Segovia-Fernandez, S. Chakraborty, J. Rivas, R. Lu, “Near Spurious-Free Thickness Shear Mode Lithium Niobate Resonator for Piezoelectric Power Conversion,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, doi: 10.1109/TUFFC.2023.3303123.
  5. J. Kramer, K. Huynh, R. Tetro, L. Matto, O. Barrera, V. Chulukhadze, D. Luccioni, L. Colombo, M. Goorsky, R. Lu, “Trilayer Periodically Poled Piezoelectric Film Lithium Niobate Resonator,” IEEE International Ultrasonics Symposium (IUS), Sept. 2023
  6. V. Chulukhadze, J. Kramer, N. Ahmed, O. Barrera, S. Cho, and R. Lu, “Frequency Tuning of Suspended Millimeter Wave Lithium Niobate Acoustic Resonators Using Ion Beam Assisted Argon Gas Cluster Trimming,” IEEE International Ultrasonics Symposium (IUS), Sept. 2023
  7. O. Barrera, J. Kramer, R. Tetro, S. Cho, V. Chulukhadze, L. Colombo and R. Lu, “Fundamental Antisymmetric Mode Acoustic Resonator in Periodically Poled Piezoelectric Film Lithium Niobate,” IEEE International Ultrasonics Symposium (IUS), Sept. 2023
  8. S. Cho, O. Barrera, P. Simeoni, J. Kramer1, V. Chulukhadze, W. Zhao, and R. Lu, “55.4 GHz Bulk Acoustic Resonator in Thin-Film Scandium Aluminum Nitride,” IEEE International Ultrasonic Symposium (IUS), 2023
  9. V. Chulukhadze, E. Stolt, W. Braun, K. Nguyen, J. Fernandez, S. Chakraborty, J. Rivas, and R. Lu, “Spurious Mode Suppression with Excited Ring in Lithium Niobate Bulk Acoustic Resonators for Piezoelectric Power Conversion,” IEEE International Ultrasonic Symposium (IUS), 2023
  10. V. Chulukhadze, K. Huynh,  J. Kramer, M. Liao, S. Cho, L. Matto, O.  Barrera, C. Cui, M. Goorsky, and R. Lu, “Frequency Scaling Millimeter Wave Acoustic Devices in Thin Film Lithium Niobate,” IEEE International Frequency Control Symposium (IFCS), May 2023
  11. J. Kramer, V. Chulukhadze, K. Huynh,  O. Barrera, M. Liao, S. Cho, L. Matto, M. Goorsky, and R. Lu, “Thin-Film Lithium Niobate Acoustic Resonator with High Q of 237 and k2 of 5.1% at 50.74 GHz,” IEEE International Frequency Control Symposium (IFCS), May 2023 (Best Student Paper Award)
  12. K. Nguyen,  E. Stolt, W. Braun, V. Chulukhadze, J. Fernandez, S. Chakraborty, J. Rivas, and R. Lu, “Spurious-Free Lithium Niobate Bulk Acoustic Resonator for Piezoelectric Power Conversion,” IEEE International Frequency Control Symposium (IFCS), May 2023
  13. S. Cho,  J. Guida, J. Kramer, O. Barrera, V. Chulukhadze, C. Cui, S. Ghosh, and R. Lu, “Analysis of 5-10 GHz Higher Order Lamb Acoustic Waves in Thin Film Scandium Aluminum Nitride,” IEEE International Frequency Control Symposium (IFCS), May 2023
  14. D. Lee, S. Jahanbani, J. Kramer, R. Lu, and K. Lai, “Nanoscale Imaging of Super-High-Frequency Microelectromechanical Resonators with Femtometer Sensitivity,” Nature Communications, Feb. 2023.
  15. J. Kramer, S. Cho, K. Huynh, V. Chulukhadze, O. Barrera, M. S. Goorsky, and R. Lu, “Extracting Acoustic Loss of High-Order Lamb Modes at Millimeter-Wave Using Acoustic Delay Lines,” IEEE IEEE International Microwave Symposium (IMS), June 2023.

2022

  1. J. Kramer, S. Cho, M. E. Liao, K. Huynh, O. Barrera, L. Matto, M. S. Goorsky, and R. Lu, “57 GHz Acoustic Resonator with k2 of 7.3% and Q of 56 and in Thin-Film Lithium Niobate,” IEEE International Electron Devices Meeting (IEDM), December 2022.
  2. J. Kramer, M. E. Liao, S. Cho, K. Huynh, O. Barrera, L. Matto, M. Goorsky, and R. Lu, “K-Band First-Order Antisymmetric Mode Acoustic Resonator in Thin-Film Lithium Niobate,” PiezoMEMS Workshop, August 2022.
  3. J. Kramer, M. E. Liao, S. Cho, K. Huynh, O. Barrera, L. Matto, M. Goorsky, and R. Lu, “Millimeter-Wave Acoustic Delay Lines in Periodically Poled Piezoelectric Film Lithium Niobate,” PiezoMEMS Workshop, August 2022.
  4. D. Lee, J. Kramer, J. Yu, S. Jahanbani, R. Lu, and K. Lai, “Spatiotemporal Imaging of Acoustic Resonators by Microwave Microscopy,” PiezoMEMS Workshop, August 2022.
  5. K. Nguyen, E. Stolt, W. D. Braun, J. Segovia-Fernandez, S. Chakraborty, J. Rivas-Davila, and R. Lu, “Near-Spurious-Free Lithium Niobate Resonator for Piezoelectric Power Conversion with Q of 3500 and kt2 of 45%,”  IEEE International Ultrasonic Symposium (IUS), October 2022. (Best Student Paper Award)
  6. J. Kramer, D. Lee, S. Cho, S. Jahanbani, K. Lai, and R. Lu, “Acoustic Wave Focusing Lens at Radio Frequencies in Thin-Film Lithium Niobate,” IEEE International Conference on Microwave Acoustics & Mechanics (IC-MAM), July 2022. (Best Student Paper Award)
  7. S. Ghosh, S. Cho, and R. Lu, “Experimental Observation of Electron-Phonon Interaction in Semiconductor on Solidly Mounted Thin-Film Lithium Niobate,” International Conference on Microwave Acoustics & Mechanics (IC-MAM), July 2022.
  8. S. Jog, J. Guan, S. Madani, R. Lu, S. Gong, D. Vasisht, H. Hassanieh, “Enabling IoT Self-Localization Using Ambient 5G Signals,” NSDI Fall, 2022.
  9. S. Cho, Y. Wang, J. Kramer, K. Nguyen, and R. Lu, “Acoustic Delay Lines in Thin-Film Lithium Niobate on Silicon Carbide,” IEEE International Microwave Symposium (IMS), June 2022.
  10. J. Junfeng Guan, J. Zhang, R. Lu, H. Seo, J. Zhou, S. Gong, and H. Hassanieh, “Efficient Wideband Spectrum Sensing Using Mems Acoustic Resonators,” GetMobile: Mobile Computing and Communications 25.3 (2022): 23-27.

2021

  1. D. Lee, S. Meyer, S. Gong, R. Lu, K. Lai, “Visualization of Acoustic Power Flow in Suspended Thin-film Lithium Niobate Phononic Devices,” Applied Physics Letter, Appl. Phys. Lett. 119, 214101,2021.
  2. E. Stolt, W. D. Braun, L. Gu, J. Segovia-Fernandez, S. Chakraborty, R. Lu, and J. Rivas-Davila, “Fixed-Frequency Control of Piezoelectric Resonator DC-DC Converters for Spurious Mode Avoidance,” in IEEE Open Journal of Power Electronics, vol. 2, pp. 582-590, 2021.
  3. R. Lu, Y. Yang, and S. Gong, “Acoustic Loss of GHz Higher-Order Lamb Waves in Thin-Film Lithium Niobate: A Comparative Study,” in Journal of Microelectromechanical Systems, vol. 30, no. 6, pp. 876-884, Dec. 2021
  4. R. Lu, and S. Gong, “RF Acoustic Microsystems Based on Suspended Lithium Niobate Thin Films: Advances and Outlook,” in Journal of Micromechanics and Microengineering, 31 114001.
  5. R. Lu, and S. Gong, “Power Flow Angles of GHz Propagating Acoustic Waves in Thin-Film Lithium Niobate,” IEEE International Ultrasonic Symposium (IUS), September 2021.
  6. R. Lu, Y. Yang, and S. Gong, “Acoustic Loss in Thin-Film Lithium Niobate: An Experimental Study,” in Journal of Microelectromechanical Systems, vol. 30, no. 4, pp. 632-641, Aug. 2021.
  7. A. E. Hassanien, R. Lu, and S. Gong, “Near-Zero Drift and High Electromechanical Coupling Acoustic Resonators at >3.5 GHz,” in IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 8, pp. 3706-3714, Aug. 2021.
  8. R. Lu, Y. Yang, A. E. Hassanien, and S. Gong, “Gigahertz Low-Loss and High Power Handling Acoustic Delay Lines Using Thin-Film Lithium Niobate on Sapphire,” in IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 7, pp. 3246-3254, July 2021.
  9. R. Lu, and S. Gong, “A 15.8 GHz A6 Mode Resonator with Q of 720 in Complementarily Oriented Piezoelectric Lithium Niobate Thin Films,” IEEE International Frequency Control Symposium (IFCS), July 2021. (Invited Presentation)
  10. R. Lu, Y. Yang, A. E. Hassanien and S. Gong, “Low-Loss and High Power Handling Acoustic Delay Lines Using Thin-Film Lithium Niobate on Sapphire,” IEEE International Microwave Symposium (IMS), June 2021.
  11. W. D. Braun, E. Stolt, L. Gu, J. Segovia-Fernandez, S. Chakraborty, R. Lu, and J. Rivas-Davila, “Optimized Resonators for Piezoelectric Power Conversion,” in IEEE Open Journal of Power Electronics, vol. 2, pp. 212-224, 2021.
  12. S. Gong, R. Lu, Y. Yang, L. Gao and A. E. Hassanien, “Microwave Acoustic Devices: Recent Advances and Outlooks,” in IEEE Journal of Microwaves, vol. 1, no. 2, pp. 601-609, Spring 2021.
  13. Y. Yang, L. Gao, R. Lu, and S. Gong, “Lateral Spurious Mode Suppression in Lithium Niobate A1 Resonators,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 68, no. 5, pp. 1930-1937, May 2021.
  14. S. R. Eisner, C.A. Chapin, R. Lu, Y. Yang, S. Gong, and D.G. Senesky, “A Laterally Vibrating Lithium Niobate MEMS Resonator Array Operating at 500 °C in Air,” in Sensors 2021, 21, 149.
  15. R. Lu, Y. Yang, S. Link, and S. Gong, “Low-Loss 5 GHz First-Order Antisymmetric Mode Acoustic Delay Lines in Thin-Film Lithium Niobate,” in IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 1, pp. 541-550, Jan. 2021.

Pre-2020

  1. R. Lu, M. Breen, A. E. Hassanien, Y. Yang, and S. Gong, “A Piezoelectric Micromachined Ultrasonic Transducer Using Thin-Film Lithium Niobate,” in IEEE Journal of Microelectromechanical Systems, vol. 29, no. 6, pp. 1412-1414, Dec. 2020.
  2. Y. Yang, R. Lu, L. Gao and S. Gong, “10-60-GHz Electromechanical Resonators Using Thin-Film Lithium Niobate,” in IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 12, pp. 5211-5220, Dec. 2020.
  3. R. Lu, Y. Yang, and S. Gong, “Low-Loss Unidirectional Acoustic Focusing Transducer in Thin-Film Lithium Niobate,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 67, no. 12, pp. 2731-2737, Dec. 2020.
  4. R. Lu, Y. Yang, S. Link, and S. Gong, “Enabling Higher-Order Lamb Wave Acoustic Devices with Complementarily Oriented Piezoelectric Thin Films,” in IEEE Journal of Microelectromechanical Systems, vol. 29, no. 5, pp. 1332-1346, Oct. 2020.
  5. R. Lu, Y. Yang, and S. Gong, “5 GHz A1 Mode Lateral Overtone Bulk Acoustic Resonators in Thin-Film Lithium Niobate,” in IEEE International Ultrasonic Symposium, Sept. 2020. 
  6. R. Lu, M. Breen, A. E. Hassanien, Y. Yang and S. Gong, “Thin-Film Lithium Niobate Based Piezoelectric Micromachined Ultrasound Transducers,” in IEEE International Ultrasonic Symposium, Sept. 2020. 
  7. S. Zhang, R. Lu, H. Zhou, S. Link, Y. Yang, Z. Li, K. Huang, X. Ou, and S. Gong, “Surface Acoustic Wave Resonators Using Lithium Niobate on Silicon Carbide,” in IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 9, pp. 3653-3666, Sept. 2020.
  8. A. Kourani, R. Lu, and S. Gong, “A Wideband Oscillator Exploiting Multiple Resonances in Lithium Niobate MEMS Resonator,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 67, no. 9, pp. 1854-1866, Sept. 2020.
  9. R. Lu, Y. Yang, M.-H. Li, and S. Gong, “GHz Low-Loss Acoustic RF Couplers in Lithium Niobate Thin Film,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 67, no. 7, pp. 1448-1461, July 2020.
  10. R. Lu, Y. Yang, S. Link, and S. Gong, “5.4 GHz Acoustic Delay Lines in Lithium Niobate Thin Film with 3 dB Insertion Loss,” in IEEE International Microwave Symposium, June 2020.
  11. R. Lu, Y. Yang, S. Link, and S. Gong, “A1 Resonators in 128° Y-cut Lithium Niobate with Electromechanical Coupling of 46.4%,” in IEEE Journal of Microelectromechanical Systems, vol. 29, no. 3, pp. 313-319, June 2020.
  12. R. Lu, S. Link, and S. Gong, “A Unidirectional Transducer Design for Scaling GHz AlN-based RF Microsystems,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 67, no. 6, pp. 1250-1257, June 2020.
  13. Y. Yang, R. Lu, and S. Gong, “High Q Antisymmetric Mode Lithium Niobate MEMS Resonators with Spurious Mitigation,” in IEEE Journal of Microelectromechanical Systems, vol. 29, no. 2, pp. 135-143, April 2020.
  14. M.-H. Li, R. Lu, T. Manzaneque, and S. Gong, “Low Phase Noise RF Oscillators Based on Thin Film Lithium Niobate Acoustic Delay Lines,” in IEEE Journal of Microelectromechanical Systems, vol. 29, no. 2, pp. 129-131, April 2020.
  15. R. Lu, Y. Yang, M.-H. Li, M. Breen, and S. Gong, “5-GHz Antisymmetric Mode Acoustic Delay Lines in Lithium Niobate Thin Film,” in IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 2, pp. 573-589, Feb. 2020.
  16. R. Lu, Y. Yang, M.-H. Li, T. Manzaneque, and S. Gong, “GHz Broadband SH0 Mode Lithium Niobate Acoustic Delay Lines,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 67, no. 2, pp. 402-412, Feb. 2020.
  17. R. Lu, Y. Yang, M. Breen, M.-H. Li, and S. Gong, “8.5 GHz and 11.5 GHz Acoustic Delay Lines Using Higher-Order Lamb Modes in Lithium Niobate Thin Film,” in Micro Electro Mechanical Systems (MEMS), IEEE International Conference on, Jan 2020.
  18. J. Moody, A. Dissanayake, H, Bishop, R. Lu, N. Liu, D. Duvvuri, A. Gao, D. Trusdell, N. S. Barker, S. Gong, B. H. Calhoun, and S. M. Bowers, “A Highly Re-configurable Bit-level Duty Cycled TRF Receiver Achieving -106 dBm Sensitivity and 33 nW Power Consumption,” in IEEE Solid-State Circuits Letters, vol. 2, no. 12, pp. 309-312, Dec. 2019.
  19. M.-H. Li, C.-Y. Chen, R. Lu, Y. Yang, T. Wu, and S. Gong, “Temperature Stability Analysis of Thin-Film Lithium Niobate SH0 Plate Wave Resonators,” in IEEE Journal of Microelectromechanical Systems, vol. 28, no. 5, pp. 799-809, Oct. 2019.
  20. R. Lu, Y. Yang, M. Breen, M.-H. Li, and S. Gong, “5 GHz Acoustic Delay Lines using Antisymmetric Mode in Lithium Niobate Thin Film,” in IEEE International Ultrasonic Symposium, Oct 2019. 
  21. Y. Yang, R. Lu, L. Gao, and S. Gong, “4.5 GHz Lithium Niobate MEMS Filters with 10% Fractional Bandwidth for 5G Front-ends,” in IEEE Journal of Microelectromechanical Systems, vol. 28, no. 4, pp. 575-577, Aug. 2019.
  22. R. Lu, S. Link, S. Zhang, M. Breen, and S. Gong, “Aluminum Nitride Lamb Wave Delay Lines with Sub-6 dB Insertion Loss,” in IEEE Journal of Microelectromechanical Systems, vol. 28, no. 4, pp. 569-571, Aug. 2019.
  23. R. Lu, T. Manzaneque, Y. Yang, M.-H. Li, and S. Gong, “Gigahertz Low-Loss and Wideband S0 Mode Lithium Niobate Acoustic Delay Lines,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 66, no. 8, pp. 1373-1386, Aug. 2019.
  24. T. Manzaneque, R. Lu, Y. Yang, and S. Gong, “Low-Loss and Wideband Acoustic Delay Lines,” in IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 4, pp. 1379-1391, April 2019.
  25. R. Lu, M.-H. Li, Y. Yang, T. Manzaneque, and S. Gong, “Accurate Extraction of Large Electromechanical Coupling in Piezoelectric MEMS Resonators,” in IEEE Journal of Microelectromechanical Systems, vol. 28, no. 2, pp. 209-218, April 2019.
  26. P. Bassirian, J. Moody, R. Lu, A. Gao, T. Manzaneque, A. Roy, N. S. Barker, B. H. Calhoun, S. Gong, and S. Bowers, “Nanowatt-Level Wakeup Receiver Front-Ends Using MEMS Resonators for Impedance Transformation,” in IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 4, pp. 1615-1627, April 2019.
  27. R. Lu, T. Manzaneque, Y. Yang, A. Gao, L. Gao, and S. Gong, “A Radio Frequency Non-reciprocal Network Based on Switched Acoustic Delay Lines,” in IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 4, pp. 1516-1530, April 2019.
  28. R. Lu, T. Manzaneque, Y. Yang, M.-H. Li, and S. Gong, “Towards Digitally Addressable Delay Synthesis: GHz Low-loss Acoustic Delay Elements from 20 ns to 900 ns,” in Micro Electro Mechanical Systems (MEMS), IEEE International Conference on, Jan 2019. 
  29. R. Lu, J. Krol, L. Gao, and S. Gong, “A Frequency Independent Framework for Synthesis of Programmable Non-reciprocal Networks,” Scientific Reports, vol.8, 14655, 2018.
  30. R. Lu, T. Manzaneque, Y. Yang, and S. Gong, “S0-Mode Lithium Niobate Acoustic Delay Lines with 1 dB Insertion Loss,” 2018 IEEE International Ultrasonic Symposium, October 2018. (Best Student Paper Award, Highlighted as Significant Advance of the Year)
  31. R. Lu, T. Manzaneque, Y. Yang, J. Zhou, H. Hassanieh, and S. Gong, “An RF Comb Filters for Sparse Fourier Transform-based Spectrum Sensing,” 2018 IEEE International Ultrasonic Symposium, October 2018. 
  32. R. Lu, T. Manzaneque, Y. Yang, A. Gao, L. Gao, and S. Gong, “A Radio Frequency Non-reciprocal Network Based on Switched Low-loss Acoustic Delay Lines,” 2018 IEEE International Ultrasonic Symposium, October 2018. 
  33. R. Lu, T. Manzaneque, Y. Yang, J. Zhou, H. Hassanieh, and S. Gong, “RF Filters with Periodic Passbands for Sparse Fourier Transform-Based Spectrum Sensing,” in IEEE Journal of Microelectromechanical Systems, vol. 27, no. 5, pp. 931-944, Oct. 2018.
  34. R. Lu, T. Manzaneque, Y. Yang, and S. Gong, “Lithium Niobate Phononic Crystals for Tailoring Performance of RF Laterally Vibrating Devices,” in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 65, no. 6, pp. 934-944, June 2018.
  35. R. Lu, T. Manzaneque, Y. Yang, A. Kourani, and S. Gong, “Lithium Niobate Lateral Overtone Resonators for Low Power Synthesis of Orthogonal Frequency Coded Transmissions,” in Micro Electro Mechanical Systems (MEMS), IEEE International Conference on, Jan 2018.
  36. R. Lu, T. Manzaneque, Y. Yang, and S. Gong, “Exploiting Parallelism in Resonators for Large Voltage Gain in Low Power Wake Up Radio Front Ends,” in Micro Electro Mechanical Systems (MEMS), IEEE International Conference on, Jan 2018.
  37. T. Manzaneque, R. Lu, Y. Yang, and S. Gong, “Lithium Niobate MEMS Chirp Compressors for Near Zero Power Wake-up Radios,” in IEEE Journal of Microelectromechanical Systems, vol. 26, no. 6, pp. 1204-1215, Dec. 2017.
  38. R. Lu, T. Manzaneque, Y. Yang, and S. Gong, “Lithium Niobate Phononic Crystals for Radio Frequency SH0 Waves,” 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS), Besancon, 2017, pp. 846-849. (Best Student Paper Award)
  39. R. Liu, S. Dev, Y. Zhong, R. Lu, W. Streyer, J.W. Allen, M.S. Allen, B. R. Wenner, S. Gong, and D. Wasserman, “Enhanced responsivity resonant RF photodetectors,” Optics Express 24, 2016.
  40. Y.-H. Song, R. Lu, and S. Gong, “Analysis and Removal of Spurious Response in SH0 Lithium Niobate MEMS Resonators,” in IEEE Transactions on Electron Devices, vol. 63, no. 5, pp. 2066-2073, May 2016.
  41. R. Liu, R. Lu, C. Roberts, S. Gong, J. W. Allen, M. S. Allen, B. R. Wenner, and D. Wasserman, “Multiplexed Infrared Photodetection using Resonant RF Circuits,” Applied Physics Letters, 108, 061101, 2016.
  42. R. Lu, T. Manzaneque, M. Breen, A. Gao, and S. Gong, “Piezoelectric RF resonant Transformers for IoT Applications,” 2016 IEEE MTT-S International Microwave Symposium (IMS), San Francisco, CA, 2016, pp. 1-4. 
  43. R. Lu, A. Gao, and S. Gong, “Deciphering Intermodulation in AlN Laterally Vibrating Resonators,” 2016 IEEE 29th International Conference on Micro Electro Mechanical Systems (MEMS), Shanghai, 2016, pp. 671-674.
  44. R. Lu, and S. Gong, “Study of Thermal Nonlinearity in Lithium Niobate-Based MEMS Resonators,” 2015 Transducers – 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), Anchorage, AK, 2015, pp. 1993-1996.
  45. R. Lu, A. Gao, and S. Gong, “Parametric Excitation in Geometrically Optimized Contour Mode AlN Resonators,” 2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum, Denver, CO, 2015, pp. 1-4.
  46. Y. Lu, X. Wang, X. Wu, J. Qin, and R. Lu, “A Non-resonant, Gravity-induced Micro Triboelectric Harvester to Collect Kinetic Energy from Low-frequency Jiggling Movements of Human Limbs,” Journal of Micromechanics and Microengineering, vol.24, no.6, May 2014.