Journal
NANO LETTERS
Volume 15, Issue 9, Pages 6116-6120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02388
Keywords
Optomechanics; microfluidics; nanomechanics; hydrodynamic model; mass sensing; thermal fluctuations
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Funding
- Netherlands Organization for Scientific Research (NWO)/Marie Curie Cofund Action via a Rubicon fellowship
- Packard Fellowship in Science and Engineering
- National Science Foundation
- DARPA/MTO ORCHID program through the Air Force Office of Scientific Research (AFOSR)
- STIR grant from Army Research Office (ARO)
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Operation of nanomechanical devices in liquid has been challenging due to the strong viscous damping that greatly impedes the mechanical motion. Here we demonstrate an optomechanical microwheel resonator integrated in microfluidic system that supports low-loss optical resonances at near-visible wavelength with quality factor up to 1.5 million, which allows the observation of the thermal Brownian motion of the mechanical mode in both air and water environment with high signal-to-background ratio. A numerical model is developed to calculate the hydrodynamic effect on the device due to the surrounding water, which agrees well with the experimental results. With its very high resonance frequency (170 MHz) and small loaded mass (75 pg), the present device has an estimated mass sensitivity at the attogram level in water.
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