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A monolithic optical sensor based on whispering-gallery modes in polystyrene microspheres

Lutti, J., Langbein, Wolfgang Werner and Borri, Paola 2008. A monolithic optical sensor based on whispering-gallery modes in polystyrene microspheres. Applied Physics Letters 93 (15) , 151103. 10.1063/1.2998652

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Abstract

We experimentally demonstrate a monolithic sensor based on sharp whispering-gallery optical resonances of polystyrene microspheres in water attached onto an optical coupler via a solid separation layer index matched to water. A Q-factor of 0.9×106 is measured on a microsphere of 44 μm diameter with a 650 nm thick separation layer. As a proof of principle of the sensing capabilities, we measure the response to refractive index changes and infer a shot-noise limited precision of 1×10−8 refractive index units.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Physics and Astronomy
Additional Information: 3 pp.
ISSN: 0003-6951
Last Modified: 03 May 2019 04:53
URI: http://orca.cf.ac.uk/id/eprint/9041

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