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Multifunctional waveguide interferometer sensor: simultaneous detection of refraction and absorption with size-exclusion function
- 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.
- Subjects :
- Materials science
Guided-mode resonance
business.industry
Attenuation
Physics::Optics
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Waveguide (optics)
Refraction
Atomic and Molecular Physics, and Optics
010309 optics
Interferometry
Wavelength
Optics
0103 physical sciences
0210 nano-technology
business
Absorption (electromagnetic radiation)
Refractive index
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 26
- Issue :
- 19
- Database :
- OpenAIRE
- Journal :
- Optics express
- Accession number :
- edsair.doi.dedup.....20af0856cf04e092e4664cd22e8e8cdb