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Issue 21, 2014
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Open-access optical microcavities for lab-on-a-chip refractive index sensing

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Abstract

Open-access optical microcavities provide a novel approach to label-free lab-on-a-chip optofluidic sensing. They offer direct access to a highly confined electromagnetic field, and yield a femtoliter detection volume. This article describes the characteristics of these devices for refractive index sensing. We show that most of the ambient noise can be removed from the refractive index data by simultaneous tracking of resonances across an array of cavities. A sensitivity of 3.5 × 10−4 RIU is demonstrated which corresponds to detecting the refractive index change caused by the presence of 500 000 glucose molecules in aqueous solution.

Graphical abstract: Open-access optical microcavities for lab-on-a-chip refractive index sensing

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Article information


Submitted
14 Jul 2014
Accepted
01 Sep 2014
First published
01 Sep 2014

Lab Chip, 2014,14, 4244-4249
Article type
Paper
Author version available

Open-access optical microcavities for lab-on-a-chip refractive index sensing

A. A. P. Trichet, J. Foster, N. E. Omori, D. James, P. R. Dolan, G. M. Hughes, C. Vallance and J. M. Smith, Lab Chip, 2014, 14, 4244
DOI: 10.1039/C4LC00817K

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