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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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Publication details

The article was received on 14 Jul 2014, accepted on 01 Sep 2014 and first published on 01 Sep 2014


Article type: Paper
DOI: 10.1039/C4LC00817K
Author version available: Download Author version (PDF)
Citation: Lab Chip, 2014,14, 4244-4249
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    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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