TITLE

Unified theory of gas damping of flexible microcantilevers at low ambient pressures

AUTHOR(S)
Bidkar, Rahul A.; Tung, Ryan C.; Alexeenko, Alina A.; Sumali, Hartono; Raman, Arvind
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/20/2009, Vol. 94 Issue 16, p163117
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Predicting the gas damping of microcantilevers oscillating in different vibration modes in unbounded gas at low pressures is relevant for increasing the sensitivity of microcantilever-based sensors. While existing free-molecular theories are valid only at very high Knudsen numbers, continuum models are valid only at very low Knudsen numbers. We solve the quasisteady Boltzmann equation and compute a closed-form fit for gas damping of rectangular microcantilevers that is valid over four orders of magnitude of Knudsen numbers spanning the free-molecular, the transition, and the low pressure slip flow regimes. Experiments are performed using silicon microcantilevers under controlled pressures to validate the theory.
ACCESSION #
38225244

 

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