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Polarization Property Associated with Surface Plasmon Resonance in a Palladium Thin-Film Coated Aluminum Grating in a Conical Mounting and Its Application to Hydrogen Gas Detection

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Udgivet i:Sensors vol. 24, no. 6 (2024), p. 1990
Hovedforfatter: Matsuda, Toyonori
Andre forfattere: Tsunoda, Isao, Koba, Shinichiro, Oshiro, Yu, Odagawa, Hiroyuki
Udgivet:
MDPI AG
Fag:
Japan
Hydrogen
Aluminum
Computer simulation
Measurement techniques
Gas detectors
Light
Thin films
Optics
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Resumen:We have investigated a polarization property of the (specularly) reflected light from an aluminum grating, coated with a palladium (Pd) thin-film on its surface. The polarization property, which is associated with surface plasmon resonance (SPR), and occurs in the Pd thin-film on the aluminum grating in a conical mounting, is observed as a rapid change in the normalized Stokes parameter <inline-formula>s3,</inline-formula> around the resonance angle, <inline-formula>θsp</inline-formula>, at which point, SPR occurs. The sensing technique used the rapid change in <inline-formula>s3</inline-formula> to allow us to successfully detect a small change in the complex refractive index of the Pd thin-film layer upon exposure to hydrogen gas, with a concentration near the lower explosion level. Experimental results showed that the sensing technique provided a sensitive and stable response when the Pd thin-film layer was exposed to gas mixtures containing hydrogen at concentrations of 1 to 4% (by volume) in nitrogen.
ISSN:1424-8220
DOI:10.3390/s24061990
Fuente:Health & Medical Collection