Semiconductor Physics, Quantum Electronics & Optoelectronics, 28 (4), P. 502–510 (2025).
DOI: https://doi.org/10.15407/spqeo28.04.502
Peculiarities of implementation of spectral SPR effect in highconductive metal thin films for creating SPR gas sensors
A.I. Biletskiy, O.L. Kukla*, Yu.M. Shirshov, O.S. Kondratenko, O.M. Fedchenko
V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine,
41 Nauky Avenue, 03028 Kyiv, Ukraine
*Corresponding author email: alex.le.kukla@gmail.com
Abstract. In this paper, we consider the conditions for excitation of surface plasmon resonance (SPR) in thin films of a number of highconductive metals (gold, silver, copper, and aluminum) with the aim of using the features of the SPR spectral effect to create chromatic sensors of gas environment. A new approach to assessing the feasibility of SPR implementation in films of these metals in different regions of the visible spectrum is proposed. This approach is based on the analysis of spectral characteristics of surface plasmonpolariton attenuation length at metal/dielectric interface. The relationship between the attenuation length and the optical constants and imaginary part of the permittivity of the metals, as well as a number of essential parameters of the SPR effect is considered and a certain correlation between them is demonstrated. It is established that for exciting SPR, the attenuation length of surface plasmonpolariton in metal films should exceed 2 m. The results of the presented theoretical analysis are compared with the experimentally obtained spectra of plasmonscattered light in the visible light wavelength range.
Keywords: surface plasmon resonance, highconductive metals, plasmonpolariton, attenuation length, wave vector, SPR spectral effect.
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