Publications

Publications

Journals

  1. D. Kim, Z. Hao, J. Ueda, A. Ansari, “A 5mg micro-bristle-bot fabricated by two-photon lithography,” Journal of Micromechanics and Microengineering (JMM). (Accepted)
  2. M. Park and A. Ansari, “Formation, Evolution and Tuning of Frequency Combs in Microelectromechanical Resonators,” Journal of Microelectromechanical Systems (JMEMS) Letters, 2019.
  3. J. M. L. Miller, A. Ansari, D. B Heinz, Y. Chen, I. B. Flader, D. D. Shin, L. G. Villanueva, T. W. Kenny, “Effective quality factor tuning mechanisms in micromechanical resonators,”Applied Physics Reviews 5, 041307, Dec. 2018.
  4. A. Ansari and M. Rais-Zadeh, “Coupled UHF micromechanical ring resonators with Schottky transducers,” Journal of Microelectromechanical Systems (JMEMS) Letters, vol. 26, no.4, pp.740-742, Apr. 2017.
  5. A. Ansari and M. Rais-Zadeh, “Depletion-mediated piezoelectric AlGaN/GaN resonators,”Physica Status Solidi (pss) (a), DOI: 10.1002/pssa.201532746, 2016.
  6. A. Ansari, C.Y. Liu, C.C. Lin, H.C. Kuo, P.C. Ku, and M. Rais-Zadeh, “GaN micromechanical resonators with meshed metal bottom electrode,” Materials, 8(3), pp. 1204-1212, March 2015.
  7. M. Rais-Zadeh, V. Gokhale, A. Ansari, M. Faucher, D. Theron, Y. Cordier, L. Buchaillot, “Gallium Nitride as an electromechanical material,” Journal of Microelectromechanical systems (JMEMS), vol. 23, no. 6, pp. 1252-1271, Dec. 2014.
  8. A. Ansari and M. Rais-Zadeh, “A temperature-compensated gallium nitride micromechanical resonator,” IEEE Electron Device Letters (EDL), vol. 35, no. 11, pp. 1127-1129, Nov. 2014.
  9. A. Ansari, and M. Rais-Zadeh, “A Thickness-mode AlGaN/GaN resonant body transistor,” IEEE Transactions on Electron Devices (T-ED), vol. 61, no. 4, pp. 1006-1013, Apr. 2014.

Conference Proceedings

  1. M. Park, A. Clark, R. Dargis, A. Ansari, “Super High Frequency Scandium Aluminum Nitride Crystalline Film Bulk Acoustic Resonators,” IEEE International Ultrasonic Symposium (IUS) 2019, 6-9 October 2019, Glasgow, Scotland, UK.
  2. M. Park, Z. Hao, D. Kim, A. Clark, R. Dargis, A. Ansari, “A 10 GHz Single Crystalline Scandium Aluminum Nitride Lamb-Wave Resonator,” Transducers 2019/EUROSENSORS XXXIII Conference, Solid-State Sensors, Actuators and Microsystems, June 23-27, Berlin, Germany (Accepted).
  3. A. Ansari, “Single Crystalline Scandium Aluminum Nitride: An Emerging Material for 5G Acoustic Filters,”  IEEE MTT-S, International Wireless Symposium, May 19-22, Guangzhou, China. (Invited)
  4. A. Clark, R. Dargis, M. Park, M. Debnath, R. Yanka, R. Pelzel, A. Ansari, “ Epitaxial Materials for RF filters,” CS MANTECH, Minneapolis, April 29, May 2, 2019. (Invited) 
  5. Z. Hao, M. Park, D. Kim, A. Clark, R. Dargis, H. Zhu, A. Ansari, “Single Crystalline ScAlN Surface Acoustic Wave Resonators with Large Figure of Merit (Q×kt2),” IEEE MTT-S International Microwave Symposium, June 2-7, Boston, MA, USA. (Student Paper Competition Finalist)
  6. R. Dargisa, A. Clark, A. Ansari, Z. Hao, M. Park, D. Kim, R. Yankaa, R. Hammond, M. Debnatha R. Pelzel, “Single crystal multilayer nitride, metal, oxide structures on engineered silicon for new generation RF filters application,” 13th International Conference on Nitride Semiconductors 2019, MRS, July 7-12, Bellevue, WA.
  7. James M. L. Miller, A. Ansari, D. B. Heinz, Y. Chen, I. B. Flader, D. D. Shin, L. G. Villanueva, and T. W. Kenny, “What is Effective Quality Factor?,” Solid-State Sensors, Actuators and Microsystems Workshop (Hilton Head), Hilton Head Island, SC, June 4-7 2018.
  8. M. Park and A. Ansari, “Self-sustained Dual-mode Mechanical Frequency Comb Sensors ,” Solid-State Sensors, Actuators and Microsystems Workshop (Hilton Head), Hilton Head Island, SC, June 4-7 2018.
  9. M. Park and A. Ansari, “Phononic Frequency Combs in Stand-alone Piezoelectric Resonators,” IEEE International Frequency Control Symposium, May 22-24, 2018.
  10. M. Rais-Zadeh, H. Zhu, A. Ansari, “Applications of gallium nitride in MEMS and acoustic microsystems,” IEEE Silicon Monolithic Integrated Circuits in RF Systems (SiRF), Jan. 2017.
  11. H. Zhu, A. Ansari, W. Luo, M. Rais-Zadeh, “Observation of acoustoelectric effect in micromachined Lamb wave delay lines with AlGaN/GaN heterostructure,” IEEE International Electron Device Meeting (IEDM), 2016.
  12. M. Moosavifar, A. Ansari, and M. Rais-Zadeh, “AlN-on-Si resonant IR sensor array with large temperature coefficient of frequency,” IEEE Sensors Conference, Oct. 30-Nov. 2, 2016.
  13. H. Zhu, A. Ansari, and M. Rais-Zadeh, “Lamb-wave dispersion in gallium nitride micromechanical resonators,” International Symposium on Compound Semiconductors (CSW), Japan, June 2016.
  14. A. Ansari H. Zhu, and M. Rais-Zadeh, “Gallium nitride high-order mode Lamb-wave resonators and delay Lines,” Solid-State Sensors, Actuators and Microsystems Workshop (Hilton Head 2016), Hilton Head Island, SC, June 2016.
  15. A. Ansari and M. Rais-Zadeh, “Frequency-tunable current-assisted AlGaN/GaN resonators,” IEEE International Conference on Micro Electro Mechanical Systems (MEMS 2016), ShangHai, China, Jan. 2016.
  16. A. Ansari, R. Tabrizian, M. Rais-Zadeh, “A high-Q AlGaN/GaN phonon trap with integrated HEMT read-out,” International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), Anchorage, Alaska, pp. 2256-2259, June 2015.
  17. A. Ansari and M. Rais-Zadeh, “Piezoresistive versus piezoelectric transduction of GaN micromechanical resonators,” International Symposium on Compound Semiconductors (CSW), Santa Barbara, CA, July 2015.
  18. A. Ansari and M. Rais-Zadeh, “Gallium nitride bulk acoustic wave resonators with embedded metal-silicon dioxide structures,” International Symposium on Compound Semiconductors (CSW), Santa Barbara, CA, July 2015.
  19. A. Ansari and M. Rais-Zadeh, “An 8.7 GHz GaN micromechanical resonator with an integrated AlGaN/GaN HEMT, “Solid-State Sensors, Actuators and Microsystems Workshop (Hilton Head), Hilton Head, SC, pp. 295-296, June 2014.
  20. A. Ansari and M. Rais-Zadeh, “HEMT-based readout of a thickness-mode AlGaN/GaN resonator,” IEEE International Electron Device Meeting (IEDM), Washington DC, pp. 1-4, Dec. 2013.
  21. A. Ansari, V. J. Gokhale, J. Roberts, and M. Rais-Zadeh, “Monolithic integration of GaN micromechanical resonators and HEMTs,” IEEE International Electron Device Meeting (IEDM), San Fransisco, CA, pp. 15.5.1 – 15.5.4, Dec. 2012.
  22. A. Ansari, V. Gokhale, V. Thakar, J. Roberts, M. Rais-Zadeh, “GaN-on-silicon micromechanical overtone resonators and filters,” IEEE International Electron Device Meeting (IEDM), Washington DC, pp. 20.3.1 – 20.3.4, Dec. 2011.

 

Workshop Presentations

  1. A. Ansari, M. H. Matheney, J. Li, R. M. Katti, M L. Roukes, “A phononic parametric oscillator,” Napa Microsystems Workshop, Napa Valley, CA, Contributed Presentation, Aug, 2017.
  2. J. M. Miller, A. Ansari, D. B. Heinz, I. B. Flader, Y. Chen, D. D. Shin, and T.W. Kenny, “Duffing Dual Hysteresis in a thermal self-oscillator,” Napa Microsystems Workshop, Aug. 2017.
  3. A. Ansari, M. H. Matheney, J. Li, R. M. Katti, M L. Roukes, “Piezoelectric non-degenerate parametric amplifiers and self-oscillators,” 14th International Workshop on Nanomechanical Sensors (NMC), Kailua Kona, Hawaii, Contributed Talk, Apr.2017.
  4. J. M. Miller, A. Ansari, D. B. Heinz, I. B. Flader, Y. Chen, D. D. Shin, T. W. Kenny, “Advent of self-oscillations in a thermally-actuated resonator,” 14th International Workshop on Nanomechanical Sensors (NMC), Kailua Kona, Hawaii, Apr. 2017.

 

Patents & Invention Disclosures

Patents

  1. M Rais-Zadeh, A Ansari, “Resonant body high electron mobility transistor,” US Patent App. 14/741,764

Invention Disclosures

  1. M. Rais-Zadeh, A. Ansari, “Acoustic diodes,” Provisional Patent, filed, 2016.
  2. M. Rais-Zadeh, A. Ansari, H. Zhu, “Piezoelectric acoustic circulators,” Provisional Patent, filed, 2016.

Theses

  1. A. Ansari, “Gallium Nitride Integrated Microsystems for Radio Frequency Applications,” University of Michigan, Ann Arbor, Aug 2016.