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

Lutti, J., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 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 2023 09:19
URI:	https://orca.cardiff.ac.uk/id/eprint/9041

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