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Issue 19, 2012
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Liquid sensing capability of rolled-up tubular optical microcavities: a theoretical study

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Abstract

Rolled-up tubular optical microcavities are a novel type of optical sensor for identifying different liquids and monitoring single cells. Based on a Mie scattering method, we systematically study the optical resonances and liquid sensing capability of microtubes. Analytical formulas are presented to calculate the resonant wavelengths λr, Q factors, sensitivities S and figures of merit QS. Both ideal and rolled-up microtubes are considered for different optical materials in tube walls (refractive indices ranging from 1.5 to 2.5) and for three setups: tube-in-liquid, hollow-tube-in-liquid and liquid-in-tube. It is found that for rolled-up microtubes, the highest QS can be achieved by using the liquid-in-tube setup and very thin wall thicknesses. A maximal sensitivity is found in the case of the liquid cylinder. Our theory well explains a recent experiment under the setup of tube-in-liquid. It is also found that, although it describes the case of tube-in-liquid well, the waveguide approximation approach is not suitable for the case of liquid-in-tube. The results could be useful to design better optofluidic devices based on rolled-up microtubes.

Graphical abstract: Liquid sensing capability of rolled-up tubular optical microcavities: a theoretical study

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Publication details

The article was received on 10 Apr 2012, accepted on 18 Jul 2012 and first published on 18 Jul 2012


Article type: Paper
DOI: 10.1039/C2LC40743D
Lab Chip, 2012,12, 3798-3802

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    Liquid sensing capability of rolled-up tubular optical microcavities: a theoretical study

    F. Zhao, T. Zhan, G. Huang, Y. Mei and X. Hu, Lab Chip, 2012, 12, 3798
    DOI: 10.1039/C2LC40743D

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