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Issue 1, 2016
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Tubular optical microcavities of indefinite medium for sensitive liquid refractometers

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Abstract

Optical microcavities enable circulated light to intensively interact with a detecting liquid, thus promising high sensitivity in fluidic refractometers. Based on Mie scattering theory, we propose a tubular metamaterial device for liquid sensing, which utilizes anisotropic metamaterials with hyperbolic dispersion called indefinite media (IM). Besides traditional whispering gallery modes (WGMs), such tubular cavities can support surface plasmon polariton (SPP) WGMs, enabling high sensitivity liquid detection. Three configurations of such metamaterial tubes for sensing are discussed: tube-in-liquid, hollow-tube-in-liquid and liquid-in-tube; these are analyzed using numerical formulas and compared with dielectric and metal materials. Compared with traditional dielectric media (DM), the IM tubular cavity exhibits a higher sensitivity (S), which is close to that of a metal tubular cavity. However, compared with metal media, such an IM cavity can achieve higher quality (Q) factors similar to the DM tubular cavity. Therefore, the IM tubular cavity can offer the highest figures of merit (QS) for the sensing performance among the three types of materials. Our results suggest a novel tubular optofluidic device based on metamaterials, which could be useful for liquid refractometers.

Graphical abstract: Tubular optical microcavities of indefinite medium for sensitive liquid refractometers

  • This article is part of the themed collection: Optofluidics
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Publication details

The article was received on 13 Oct 2015, accepted on 09 Nov 2015 and first published on 09 Nov 2015


Article type: Paper
DOI: 10.1039/C5LC01266J
Lab Chip, 2016,16, 182-187

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    Tubular optical microcavities of indefinite medium for sensitive liquid refractometers

    S. Tang, Y. Fang, Z. Liu, L. Zhou and Y. Mei, Lab Chip, 2016, 16, 182
    DOI: 10.1039/C5LC01266J

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