Reducing support loss in micromechanical ring resonators using phononic band-gap structures

In micromechanical resonators, energy loss via supports into the substrates may lead to a low quality factor. To eliminate the support loss, in this paper a phononic band-gap structure is employed. We demonstrate a design of phononic-crystal (PC) strips used to support extensional wine-glass mode ri...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2011-09, Vol.44 (37), p.375101-1-10
Main Authors: Hsu, Feng-Chia, Hsu, Jin-Chen, Huang, Tsun-Che, Wang, Chin-Hung, Chang, Pin
Format: Article
Language:English
Subjects:
Applied sciences
Banded structure
Bands
Dispersions
Electronics
Exact sciences and technology
Internal energy
Micro- and nanoelectromechanical devices (mems/nems)
Polycarbonates
Quality factor
Resonators
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Strip
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Summary:In micromechanical resonators, energy loss via supports into the substrates may lead to a low quality factor. To eliminate the support loss, in this paper a phononic band-gap structure is employed. We demonstrate a design of phononic-crystal (PC) strips used to support extensional wine-glass mode ring resonators to increase the quality factor. The PC strips are introduced to stop elastic-wave propagation by the band-gap and deaf-band effects. Analyses of resonant characteristics of the ring resonators and the dispersion relations, eigenmodes, and transmission properties of the PC strips are presented. With the proposed resonator architecture, the finite-element simulations show that the leaky power is effectively reduced and the stored energy inside the resonators is enhanced simultaneously as the operating frequencies of the resonators are within the band gap or deaf bands. Realization of a high quality factor micromechanical ring resonator with minimized support loss is expected.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/44/37/375101