Surface sensitive microfluidic optomechanical ring resonator sensors

Surface sensitive microfluidic optomechanical ring resonator sensors

The microfluidic optomechanical ring resonator (μFOMRR) based on a thin-walled glass capillary supports high Q-factor (>103) mechanical modes in the presence of liquids. In this letter, the sensitivity of the μFOMRR to the surface change is studied by layer-by-layer removal of SiO2 molecules from...

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Bibliographic Details
Published in:Applied physics letters Vol. 105; no. 19
Main Authors: Kim, Kyu Hyun, Fan, Xudong
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 10-11-2014
Subjects:
Applied physics
Hydrofluoric acid
Resonators
Sensitivity
Silicon dioxide
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Summary:The microfluidic optomechanical ring resonator (μFOMRR) based on a thin-walled glass capillary supports high Q-factor (>103) mechanical modes in the presence of liquids. In this letter, the sensitivity of the μFOMRR to the surface change is studied by layer-by-layer removal of SiO2 molecules from the μFOMRR inner surface using various concentrations of hydrofluoric acid solutions. A frequency downshift is observed with a sensitivity for the surface density change of 1.2 Hz/(pg/mm2), which translates to a detection limit of 83 pg/mm2. This work opens a door to using the optomechanical mode for detection and characterization of molecules near the resonator surface.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4901067