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: | Schools > Biosciences Schools > 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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