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Multifunctional waveguide interferometer sensor: simultaneous detection of refraction and absorption with size-exclusion function

Zhou, Chen; Hedayati, Mehdi Keshavarz; Kristensen, Anders

Multifunctional waveguide interferometer sensor: simultaneous detection of refraction and absorption with size-exclusion function Thumbnail


Authors

Chen Zhou

Mehdi Keshavarz Hedayati

Anders Kristensen



Contributors

Abstract

A waveguide Young interferometer is presented with simultaneous detection of complex refractive index of a liquid sample. The real part of the refractive index change (refraction) is detected by tracing phase shifts of the interferogram generated by a sensing and reference waveguide. The imaginary part of the refractive index (absorption) is determined by the attenuation of the transmitted signal at certain wavelength. Furthermore, nano-filters are fabricated atop the sensing waveguide, which enables size-exclusion filtering of species to the evanescent field. It shows capability of distinguishing small and large particles from 100 nm to 500 nm in diameter, which is further confirmed by fluorescent excitation experiments. The present sensor could find broad application in optical characterization of complex turbid media with regard to their complex refractive index.

Citation

Zhou, C., Hedayati, M. K., & Kristensen, A. (2018). Multifunctional waveguide interferometer sensor: simultaneous detection of refraction and absorption with size-exclusion function. Optics Express, 26(19), 24372-24383. https://doi.org/10.1364/oe.26.024372

Journal Article Type Article
Acceptance Date Aug 28, 2018
Online Publication Date Sep 4, 2018
Publication Date Sep 4, 2018
Deposit Date Oct 1, 2018
Publicly Available Date Oct 5, 2018
Journal Optics Express
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 26
Issue 19
Pages 24372-24383
DOI https://doi.org/10.1364/oe.26.024372

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