Micro Structures & Sensors Lab
Kenny Group @ Stanford

Chae Hyuck Ahn


Ph.D Candidate

ahn1229 :at: mems.stanford.edu
440 Escondido Mall, Bldg 530, Rm 224, Stanford, CA 94305, USA
Advisor: Thomas W. Kenny

Research

Design/Characterize MEMS sensors
- 3-axis Disk Resonating Gyroscope
- Develop the platform for multi-sensor integration

Integrated Epi-Seal MEMS

Disk Resonator Gyroscope


Education

Stanford University
(2012 - present) PhD Candidate in Mechanical Engineering

Stanford University
(2010 - 2012) M.S. in Mechanical Engineering, Depth: Mechatronics, MEMS

Seoul National University (Seoul, South Korea)
(2003 - 2010) B.S. in Mechanical Engineering, Combined major in Biotechnology (Interdisciplinary Program)

Experience

Military Service in Republic of Korea Air Force, Seoul, South Korea
(2005 - 2007)

Fellowships / Awards

Kwanjeong foundation Scholarship - Seoul, South Korea
(Aug.2013 - present)

KETEP Scholarship, Korea Institute of Energy Technology Evaluation and Planning - Seoul, South Korea
(Sep.2010 – Jun.2012)

Korea Science and Engineering Foundation (KOSEF) Scholarship, KOSEF
(Spring 2004)

Publications

Journal
Chae Hyuck Ahn, Eldwin J. Ng, Vu A. Hong, Yushi Yang, Brian J. Lee, Ian Flader, Thomas W. Kenny, "Mode-Matching of Wineglass Mode Disk Resonator Gyroscope in (100) Single Crystal Silicon," Journal of Microelectromechanical Systems, 2014.
Conference
Yushi Yang, Eldwin J. Ng, Vu A. Hong, Chae Hyuck Ahn, Yunhan Chen, Elia Ahadi, Mark Dykman, and Thomas W. Kenny, "Measurement of the nonlinear elasticity of doped bulk-mode MEMS resonators," Solid-State Sensors, Actuators, and Microsystems Workshop, Hilton Head 2014, pp. 285-288, 2014.
Journal
Bo Woon Soon, Eldwin J. Ng, Vu A. Hong, Yushi Yang, Chae Hyuck Ahn, You Qian, Thomas W. Kenny, and Chengkuo Lee, "Fabrication and Characterization of a Vacuum Encapsulated Curved Beam Switch for Harsh Environment Application," Journal of Microelectromechanical Systems, 2014.
Conference
David B. Heinz, Vu A. Hong, Eldwin J. Ng, Chae Hyuck Ahn, Yushi Yang, and Thomas W. Kenny, "Characterization of stiction forces in ultra-clean encapsulated MEMS devices," 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 588-591, 2014.
Conference
C. L. Roozeboom, V. A. Hong, C. H. Ahn, E. J. Ng, Y. Yang, B. E. Hill, M. A. Hopcroft, and B. L. Pruitt, "Multifunctional integrated sensor in A 2×2 mm epitaxial sealed chip operating in a wireless sensor node," 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 773-776, 2014.
Conference
Mo Li, Eldwin J. Ng, Vu A. Hong, Chae H. Ahn, Yushi Yang, Thomas W. Kenny, and David A. Horsley, "Single-structure 3-axis lorentz force magnetometer with sub-30 nT/√HZ resolution," 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 80-83, 2014.
Conference
D. Senkal, S. Askari, M. J. Ahamed, E. J. Ng, V. Hong, Y. Yang, C. H. Ahn, T. W. Kenny, and A. M. Shkel, "100K Q-factor toroidal ring gyroscope implemented in wafer-level epitaxial silicon encapsulation process," 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 24-27, 2014.
Conference
E. J. Ng, Y. Yang,V. A. Hong, C. H. Ahn, D. L. Christensen, B. A. Gibson, K. R. Qalandar, K. L. Turner, T. W. Kenny, "Stable Pull-In Electrodes for Narrow Gap Actuation," IEEE International Conference on Micro Electro Mechanical Systems (MEMS) 2014, pp. 1281-1284, 2014.
Conference
E. J. Ng, K. L. Harrison, C. L. Everhart, V. A. Hong, Y. Yang, C. H. Ahn, D. B. Heinz, R. T. Howe and T. W. Kenny, "Stable Charge-Biased Capacitive Resonators with Encapsulated Switches," IEEE International Conference on Micro Electro Mechanical Systems (MEMS) 2014, pp. 1277-1280, 2014.
Journal
Eldwin J. Ng, Vu A. Hong, Yushi Yang, Chae Hyuck Ahn, Camille L. M. Everhart, and Thomas W. Kenny, "Temperature Dependence of the Elastic Constants of Doped Silicon," Journal of Microelectromechanical Systems, pp. 1-1, 2014.
Journal
Shirin Ghaffari, Saurabh A. Chandorkar, Shasha Wang, Eldwin J. Ng, Chae H. Ahn, Vu Hong, Yushi Yang, and Thomas W. Kenny, "Quantum Limit of Quality Factor in Silicon Micro and Nano Mechanical Resonators," Scientific Reports, Vol. 3, 2013.
Journal
M. Li, E. J. Ng, V. A. Hong, C. H. Ahn, Y. Yang, T. W. Kenny, and D. A. Horsley, "Lorentz force magnetometer using a micromechanical oscillator," Applied Physics Letters, Vol. 103, No. 17, pp. 173504, 2013.
Journal
Shirin Ghaffari, Chae H. Ahn, Eldwin J. Ng, Shasha Wang, and Thomas W. Kenny, "Crystallographic effects in modeling fundamental behavior of MEMS silicon resonators," Microelectronics Journal, Vol. 44, No. 7, pp. 586-591, 2013.
Conference
Y. Yang, E. J. Ng, C. H. Ahn, V. A. Hong, E. Ahadi, and T. W. Kenny, "Mechanical coupling of dual breathe-mode ring resonator," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 502-505, 2013.
Conference
V. A. Hong, B. J. Lee, D. L. Christensen, D. B. Heinz, E. J. Ng, C. H. Ahn, Y. Yang, and T. W. Kenny, "X-Y and Z-axis capacitive accelerometers packaged in an ultra-clean hermetic environment," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 618-621, 2013.
Conference
E. J. Ng, C.-F. Chiang, Y. Yang, V. A. Hong, C. H. Ahn, and T. W. Kenny, "Ultra-high aspect ratio trenches in single crystal silicon with epitaxial gap tuning," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 182-185, 2013.
Conference
E. J. Ng, C. H. Ahn, Y. Yang, V. A. Hong, C.-F. Chiang, E. Ahadi, M. W. Ward, and T. W. Kenny, "Localized, degenerately doped epitaxial silicon for temperature compensation of resonant MEMS systems," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 2419-2422, 2013.
Conference
C. H. Ahn, E. J. Ng, V. A. Hong, Y. Yang, B. J. Lee, M. W. Ward, and T. W. Kenny, "Geometric compensation of (100) single crystal silicon disk resonating gyroscope for mode-matching," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 1723-1726, 2013.
Conference
D. L. Christensen, C. H. Ahn, V. A. Hong, E. J. Ng, Y. Yang, B. J. Lee, and T. W. Kenny, "Hermetically encapsulated differential resonant accelerometer," 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), pp. 606-609, 2013.
Journal
Eldwin J. Ng, Hyung Kyu Lee, Chae Hyuck Ahn, Renata Melamud, and Thomas W. Kenny, "Stability of Silicon Microelectromechanical Systems Resonant Thermometers," IEEE Sensors Journal, Vol. 13, No. 3, pp. 987-993, 2013.
Conference
S. Nitzan, C. H. Ahn, T.-H. Su, M. Li, E. J. Ng, S. Wang, Z. M. Yang, G. O'Brien, B. E. Boser, T. W. Kenny, and D. A. Horsley, "Epitaxially-encapsulated polysilicon disk resonator gyroscope," 2013 IEEE 26th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 625-628, 2013.
Conference
Chia-Fang Chiang, Andrew B. Graham, Brian J. Lee, Chae Hyuck Ahn, Eldwin J. Ng, Gary J. O'Brien, and Thomas W. Kenny, "Resonant pressure sensor with on-chip temperature and strain sensors for error correction," 2013 IEEE 26th International Conference on Micro Electro Mechanical Systems (MEMS), pp. 45-48, 2013.
Conference
Chia-Fang Chiang, Andrew B. Graham, Eldwin J. Ng, Chae Hyuck Ahn, Gary J. O'Brien, and Thomas W. Kenny, "A novel, high-resolution resonant thermometer used for temperature compensation of a cofabricated pressure sensor," Solid-State Sensors, Actuators, and Microsystems Workshop, Hilton Head 2012, pp. 54-57, 2012.
Conference
Eldwin J. Ng, Hyung Kyu Lee, Chae Hyuck Ahn, Renata Melamud, and Thomas W. Kenny, "Stability measurements of silicon MEMS resonant thermometers," 2011 IEEE SENSORS Proceedings, pp. 1257-1260, 2011.