Identifying spurious modes in RF-MEMS resonators using photoelastic imaging

Published: January 21, 2018


Vikrant J. Gokhale, Jason J. Gorman


This paper reports the first use of dynamic photoelastic imaging for identifying in-plane vibration modes in high-frequency MEMS resonators. In a set of width-extensional mode resonators (WE-BARs), we map fundamental width-extensional modes and unwanted higher-order spurious length-extensional modes . In addition, we detect unexpected spurious modes for all designs that are potentially detrimental due to their proximity to the fundamental mode. We show the dependence of both intended modes and spurious modes on aspect ratio and discuss methods of mitigation for the latter. It is shown that the photoelastic technique is broadly applicable to high-resolution mapping and identification of vibration modes in MEMS resonators.
Proceedings Title: IEEE International Conference on Micro Electro Mechanical Systems(MEMS 2018)
Conference Dates: January 21-25, 2018
Conference Location: Belfast, -1
Pub Type: Conferences


resonator, MEMS, photoelastic, mode shapes
Created January 21, 2018, Updated November 10, 2018