Dynamics of a surface-modified miniaturized SiN mechanical resonator via a nanometer-scale pore array

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Title
Dynamics of a surface-modified miniaturized SiN mechanical resonator via a nanometer-scale pore array
Author(s)
Eun Joong Lee; Myung Rae Cho; Seunghwan Kim; Yun Daniel Park; Taejoon Kouh
Publication Date
2016-05
Journal
NANOTECHNOLOGY, v.27, no.19, pp.195203 -
Publisher
IOP PUBLISHING LTD
Abstract
We have fabricated porous miniaturized SiN resonators with various dimensions and studied their mechanical dynamics at their resonant modes. The surface modification of the resonators has been achieved by etching through a thin porous anodic aluminum oxide (AAO) mask, prepared by two-step anodization. Even though these porous resonators show well-defined Lorentzian line-shapes at their resonant modes, the corresponding fundamental flexural resonance frequencies are lower than those from typical non-porous resonators. The change in the resonance frequency is due to the presence of the pores on the surface, which reduces the effective tensile stress across the beam structure, as shown from both experimental measurements and the computational model. In addition, the observed quality factor reveals the level of dissipation originating from the surface modification. The principal dissipation mechanism is found to be gas damping in the free molecular flow regime. Based on the dissipation measurement, one can see an increase in the surface-to-mass ratio, which is responsible for the increased dissipation in the porous beam structure. The work presented here demonstrates simple integration of mechanical elements with a nanopatterning technique based on an AAO as well as the tuning of mechanics via surface modification at a small scale. Such a scheme could provide an additional degree of freedom in developing a mechanical sensing element with enhanced effective surface area.
URI
https://pr.ibs.re.kr/handle/8788114/3067
ISSN
0957-4484
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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