Effects of water-absorption and thermal drift on a polymeric photonic crystal slab sensor

Kristian Tølbøl Sørensen, Charlotte Bonde Ingvorsen, Line Hagner Nielsen, Anders Kristensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A photonic crystal slab (PCS) sensor is a universal refractive index sensor with possibilities and performance very similar to surface plasmon resonance (SPR), which represents the gold standard of biosensing. Cheap PCS sensors can be made vacuum-free entirely out of polymers, but come with additional challenges, besides those relating to temperature-variations, which must be considered in any refractive index based method: The polymeric waveguide core was found to swell by ?0.3% as water absorbed into the waveguide core over ?1.5 h. This was investigated by monitoring the wavelength of resonant reflection during absorption, by monitoring the release of water using ellipsometry, and by rigorous coupled-wave analysis (RCWA). The approach presented here enables monitoring of water uptake and thermal fluctuations, for drift-free, high-performance operation of a polymeric PCS sensor.
Original languageEnglish
JournalOptics Express
Volume26
Issue number5
Pages (from-to)5416-5422
Number of pages7
ISSN1094-4087
DOIs
Publication statusPublished - 2018

Bibliographical note

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

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