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Highly Sensitive Plasmonic Structures Utilizing a Silicon Dioxide Overlayer
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SYSNO ASEP 0561882 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Highly Sensitive Plasmonic Structures Utilizing a Silicon Dioxide Overlayer Author(s) Chylek, J. (CZ)
Maniaková, P. (SK)
Hlubina, P. (CZ)
Sobota, Jaroslav (UPT-D) RID, ORCID, SAI
Pudiš, D. (SK)Number of authors 5 Article number 3090 Source Title Nanomaterials. - : MDPI
Roč. 12, č. 18 (2022)Number of pages 13 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords surface plasmon resonance ; Kretschmann configuration ; silicon dioxide overlayer ; reflectance ; aqueous analyte sensing 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 000857073900001 EID SCOPUS 85138715666 DOI 10.3390/nano12183090 Annotation In this paper, simple and highly sensitive plasmonic structures are analyzed theoretically and experimentally. A structure comprising a glass substrate with a gold layer, two adhesion layers of chromium, and a silicon dioxide overlayer is employed in liquid analyte sensing. The sensing properties of two structures with distinct protective layer thicknesses are derived based on a wavelength interrogation method. Spectral reflectance responses in the Kretschmann configuration with a coupling BK7 prism are presented, using the thicknesses of individual layers obtained by a method of spectral ellipsometry. In the measured spectral reflectance, a pronounced dip is resolved, which is strongly red-shifted as the refractive index (RI) of the analyte increases. Consequently, a sensitivity of 15,785 nm per RI unit (RIU) and a figure of merit (FOM) of 37.9 RIU-1 are reached for the silicon dioxide overlayer thickness of 147.5 nm. These results are in agreement with the theoretical ones, confirming that both the sensitivity and FOM can be enhanced using a thicker silicon dioxide overlayer. The designed structures prove to be advantageous as their durable design ensures the repeatability of measurement and extends their employment compared to regularly used structures for aqueous analyte sensing. 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/2079-4991/12/18/3090
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