Back to Search Start Over

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

Authors :
Chen Zhou
Anders Kristensen
Mehdi Keshavarz Hedayati
Source :
Optics express, 2018, Vol.26(19), pp.24372-24383 [Peer Reviewed Journal], Zhou, C, Keshavarz Hedayati, M & Kristensen, A 2018, ' Multifunctional waveguide interferometer sensor: Simultaneous detection of refraction and absorption with size-exclusion function ', Optics Express, vol. 26, no. 19, pp. 24372-24383 . https://doi.org/10.1364/OE.26.024372
Publication Year :
2018

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.

Details

ISSN :
10944087
Volume :
26
Issue :
19
Database :
OpenAIRE
Journal :
Optics express
Accession number :
edsair.doi.dedup.....20af0856cf04e092e4664cd22e8e8cdb