Optically Driven Resonance of Nanoscale Flexural Oscillators in Liquid

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• 作者：Scott S. Verbridge ; Leon M. Bellan ; Jeevak M. Parpia ; H. G. Craighead
• 刊名：Nano Letters
• 出版年：2006
• 出版时间：September 2006
• 年：2006
• 卷：6
• 期：9
• 页码：2109 - 2114
• 全文大小：289K
• 年卷期：v.6,no.9(September 2006)
• ISSN：1530-6992

文摘

We demonstrate the operation of radio frequency nanoscale flexural resonators in air and liquid. Doubly clamped string, as well as singlyclamped cantilever resonators, with nanoscale cross-sectional dimensions and resonant frequencies as high as 145 MHz are driven in air aswell as liquid with an amplitude modulated laser. We show that this laser drive technique can impart sufficient energy to a nanoscale resonatorto overcome the strong viscous damping present in these media, resulting in a mechanical resonance that can be measured by opticalinterference techniques. Resonance in air, isopropyl alcohol, acetone, water, and phosphate-buffered saline is demonstrated for devices havingcross-sectional dimensions close to 100 nm. For operation in air, quality factors as high as 400 at 145 MHz are demonstrated. In liquid, qualityfactors ranging from 3 to 10 and frequencies ranging from 20 to 100 MHz are observed. These devices, and an all-optical actuation anddetection system, may provide insight into the physics of the interaction of nanoscale mechanical structures with their environments, greatlyextending the viscosity range over which such small flexural resonant devices can be operated.