28 April 2010 Fiber-tip resonator excited by radiation pressure and photo-thermal effect
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Abstract
A mechanical resonator was fabricated on the tip of a standard single mode fiber with outer diameter of 125 μm. The fabrication process involved a single-mode to a multimode fiber splicing, sputtering coating of a submicron gold nanofilm, focused ion beam (FIB) patterning and chemical wet etching. A micro-vibrating disk with suspension arms was formed on the sensing fiber tip, the resonance frequency of the vibrator is sensitive to mass loading on its surface. Vibration was excited by laser excitation via the radiation pressure and the photo-thermal effect and detected by a CW laser beam at another wavelength. The detected intensity of the fundamental and higher order harmonics can be monitored for resonance frequency determination. The excitation and detection beams were multiplexed within a single fiber link, which makes the sensor compact and versatile. The resonator maintained relatively high quality factor in air and was successfully applied to the analysis of layer-by-layer electrostatic self-assembly and immuno-sensing.
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Cheng Ma, Anbo Wang, "Fiber-tip resonator excited by radiation pressure and photo-thermal effect", Proc. SPIE 7682, Photonic Microdevices/Microstructures for Sensing II, 76820E (28 April 2010); doi: 10.1117/12.851749; https://doi.org/10.1117/12.851749
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