Hadi Najar

Alum
Department of Electrical and Computer Engineering
Email: hnajar AT ucdavis.edu

Research

Materials for High Quality-Factor Resonating Gyroscopes

Background

Hadi Najar received the B.A.Sc. and the M.A.Sc. degrees in electrical and computer engineering from the University of British Columbia, Vancouver in 2008 and 2010, respectively. He joined the MEMS Lab at the University of California, Davis in 2010 working under the supervision of Prof. Horsley. For his Ph.D., his work involved the study of CVD diamond as a material for high Q-factor resonators.

Areas of Interest

MEMS Inertial Sensors
Signal Processing
Capacitive Micromachine Ultrasound Transducers (CMUT)

Publications

Journals

  • Najar, H.;Chan, M.-L.; Yang, H.-S.; Lin, L.; Cahill, D.G; Horsley, D.A., “High quality factor nanocrystalline diamond micromechanical resonators limited by thermoelastic damping”, Applied Physics Letters, 104, 151903 (2014)
    doi: 10.1063/1.4871803
  • A. Heidari, M.-L. Chan, H.-A. Yang, G. Jaramillo, P. Taheri-Tehrani, P. Fonda, H. Najar, K. Yamazaki, L. Lin, and D. A. Horsley, “Hemispherical wineglass resonators fabricated from the microcrystalline diamond,” J. Micromech. Microeng., vol. 23, no. 12, p. 125016, Dec. 2013.
    doi:10.1088/0960-1317/23/12/125016
  • H. Najar, A. Heidari, M.-L. Chan, H.-A. Yang, L. Lin, D. G. Cahill, and D. A. Horsley, “Microcrystalline diamond micromechanical resonators with quality factor limited by thermoelastic damping,” Applied Physics Letters, vol. 102, no. 7, p. 071901, Feb. 2013.
    doi: 10.1063/1.4793234

Conferences

  • Saito, Daisuke; Yang, Chen; Heidari, Amir; Najar, Hadi; Lin, Liwei; Horsley, David A., “Batch-fabricated high Q-factor microcrystalline diamond cylindrical resonator,” Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on , vol., no., pp.801,804, 18-22 Jan. 2015
    doi: 10.1109/MEMSYS.2015.7051080
  • Najar, H.; Thron, A; Yang, C.; Fung, S.; van Benthem, K.; Lin, L.; Horsley, D.A, “Increased thermal conductivity polycrystalline diamond for low-dissipation micromechanical resonators,” Micro Electro Mechanical Systems (MEMS), 2014 IEEE 27th International Conference on , vol., no., pp.628,631, 26-30 Jan. 2014
    doi: 10.1109/MEMSYS.2014.6765719
  • Heidari, A; Chan, M.-L.; Yang, H.-A; Jaramillo, G.; Taheri-Tehrani, P.; Fonda, P.; Najar, H.; Yamazaki, K.; Lin, L.; Horsley, D.A, “Micromachined polycrystalline diamond hemispherical shell resonators,” Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013 Transducers & Eurosensors XXVII: The 17th International Conference on , vol., no., pp.2415,2418, 16-20 June 2013
    doi: 10.1109/Transducers.2013.6627293
  • Kline, M.H.; Yeh, Y.; Eminoglu, B.; Najar, H.; Daneman, M.; Horsley, D.A; Boser, B.E., “Quadrature FM gyroscope,” Micro Electro Mechanical Systems (MEMS), 2013 IEEE 26th International Conference on , vol., no., pp.604,608, 20-24 Jan. 2013
    doi: 10.1109/MEMSYS.2013.6474314
  • Najar, H.; Mei-Lin Chan; Jin Xie; Liwei Lin; Horsley, D.A, “Impact of doping and microstructure on quality factor of CVD diamond micromechanical resonators,” Frequency Control Symposium (FCS), 2012 IEEE International , vol., no., pp.1,5, 21-24 May 2012
    doi: 10.1109/FCS.2012.6243675
  • M.L. Chan, P. Fonda, C. Reyes, J. Xie, H. Najar, L. Lin, K. Yamazaki, and D.A. Horsley, “Micromachining 3D Hemispherical Features in Silicon Via Micro-EDM,” Proc. 25th IEEE Intl. Conf. on Micro Electromechanical Systems, Paris, France, 2012.
    doi: 10.1109/MEMSYS.2012.6170151
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