TITLE

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

AUTHOR(S)
Lutti, Julie; Langbein, Wolfgang; Borri, Paola
PUB. DATE
October 2008
SOURCE
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p151103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
34984773

 

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