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One-Dimensional Photonic Crystals with Different Termination Layer Thicknesses and Very Narrow Bloch Surface Wave and Guided Wave Based Resonances for Sensing Applications
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SYSNO ASEP 0560663 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title One-Dimensional Photonic Crystals with Different Termination Layer Thicknesses and Very Narrow Bloch Surface Wave and Guided Wave Based Resonances for Sensing Applications Author(s) Fořt, Tomáš (UPT-D) RID, ORCID, SAI
Kaňok, R. (CZ)
Hlubina, P. (CZ)
Pokorný, Pavel (UPT-D) RID, SAI, ORCID
Sobota, Jaroslav (UPT-D) RID, ORCID, SAINumber of authors 5 Article number 561 Source Title Photonics. - : MDPI
Roč. 9, č. 8 (2022)Number of pages 13 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords photonic crystal ; Bloch surface wave ; termination layer ; reflectance ; phase shift ; Kretschmann configuration Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Open access Institutional support UPT-D - RVO:68081731 UT WOS 000845924200001 EID SCOPUS 85137360528 DOI 10.3390/photonics9080561 Annotation We demonstrate an efficient sensing of both gaseous and aqueous analytes utilizing Bloch surface waves (BSWs) and guided waves (GWs) excited on a truncated one-dimensional photonic crystal (1DPhC) composed of six TiO2/SiO2 bilayers with a termination layer of TiO2. For the gaseous analytes, we show that 1DPhC can support the GW excited by an s-polarized wave and the theoretical shift of the resonance wavelength is linear for small changes in the analyte refractive index (RI), giving a constant RI sensitivity of 87 nm per RI unit (RIU). In addition, for the aqueous analytes, the GW excited by s-polarized and BSW by p-polarized waves can be resolved and exploited for sensing applications. We compare two designed and realized 1DPhCs with termination layer thicknesses of 60 nm and 50 nm, respectively, and show experimentally the differences in their very narrow reflectance and phase responses. An RI sensitivity and figure of merit as high as 544.3 nm/RIU and 303 RIU-1, respectively, are obtained for the smaller thickness when both s- and p-polarized BSWs are excited. This is the first demonstration of both very deep BSW-based resonances in two orthogonal polarizations and a very narrow resonance in one of them. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2023 Electronic address https://www.mdpi.com/2304-6732/9/8/561
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