Journal article
Effects of water-absorption and thermal drift on a polymeric photonic crystal slab sensor
Department of Micro- and Nanotechnology, Technical University of Denmark1
Optofluidics, Department of Micro- and Nanotechnology, Technical University of Denmark2
Technical University of Denmark3
Nanoprobes, Department of Micro- and Nanotechnology, Technical University of Denmark4
Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics, Department of Health Technology, Technical University of Denmark5
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.
Language: | English |
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Year: | 2018 |
Pages: | 5416-5422 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OE.26.005416 |
ORCIDs: | Sørensen, Kristian Tølbøl , Nielsen, Line Hagner and Kristensen, Anders |