Refractometric micro-sensor using a mirrored capillary resonator
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(Published version)
Date
2016
Authors
Morrish, W.
West, P.
Orlando, N.
Klantsataya, E.
Gardner, K.
Lane, S.
Decorby, R.
François, A.
Meldrum, A.
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Journal article
Citation
Optics Express, 2016; 24(22):24959-24970
Statement of Responsibility
William Morrish, Peter West, Nathan Orlando, Elizaveta Klantsataya, Kirsty Gardner, Stephen Lane, Raymond Decorby, Alexandre François, and Alkiviathes Meldrum
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Abstract
We report on a flow-through optical sensor consisting of a microcapillary with mirrored channels. Illuminating the structure from the side results in a complicated spectral interference pattern due to the different cavities formed between the inner and outer capillary walls. Using a Fourier transform technique to isolate the desired channel modes and measure their resonance shift, we obtain a refractometric detection limit of (6.3 ± 1.1) x 10−6 RIU near a center wavelength of 600 nm. This simple device demonstrates experimental refractometric sensitivities up to (5.6 ± 0.2) x 102 nm/RIU in the visible spectrum, and it is calculated to reach 1540 nm/RIU with a detection limit of 2.3 x 10−6 RIU at a wavelength of 1.55 µm. These values are comparable to or exceed some of the best Fabry-Perot sensors reported to date. Furthermore, the device can function as a gas or liquid sensor or even as a pressure sensor owing to its high refractometric sensitivity and simple operation.
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Published 17 Oct 2016
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© 2016 Optical Society of America. Open Access - CC BY license.