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Optical and Galvanomagnetic Properties of Bi1-xSbx Thin Films in the Terahertz Frequency Range
Open AccessFeature PaperArticle

Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

1
Budker Institute of Nuclear Physics SB RAS, 11, Ac. Lavrentiev Ave., Novosibirsk 630090, Russia
2
Analytical and Technological Research Center, Novosibirsk State University, 2, Pirogov St., Novosibirsk 630090, Russia
3
Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk Branch “TDIAM”, 2/1, Ac. Lavrentiev Ave., Novosibirsk 630090, Russia
4
Institute of Laser Physics SB RAS, 11, Ac. Lavrentiev Ave., Novosibirsk 630090, Russia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3595; https://doi.org/10.3390/app10103595
Received: 22 April 2020 / Revised: 15 May 2020 / Accepted: 20 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Terahertz Sensing)
In this paper, we studied the sensing performance of metasurfaces comprised by spiral-disk-shaped metallic elements patterned on polypropylene substrates, which exhibited localized surface plasmon resonances in the low-frequency region of the terahertz (THz) spectrum (0.2–0.5 THz). Optimal designs of spiral disks with C-shaped resonators placed near the disks were determined and fabricated. The experimentally measured transmittance spectra of the samples coated with very thin photoresistive layers (d ~ 10−4–10−3 λ) showed good agreement with the simulations. The resonance frequency shift Δf increases with increasing d, while saturating near d = 50 µm. The narrow-band magnetic dark modes excited on symmetrical spiral disks with a 90° C-resonator demonstrated very high figure of merit (FOM) values reaching 1670 (RIU·mm)−1 at 0.3 μm thick analyte. The hybrid high order resonances excited on asymmetrical densely packed spiral disks showed about two times larger FOM values (up to 2950 (RIU·mm)−1) compared to symmetrical distantly spaced spirals that resembled the best FOM results found in the literature for metasurfaces fabricated with a similar technique. The demonstrated high sensing performance of spiral disks is evaluated to be promising for bio-sensing applications in the THz range. View Full-Text
Keywords: metasurface; localized surface plasmon resonance; thin-film sensor; terahertz metasurface; localized surface plasmon resonance; thin-film sensor; terahertz
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Gerasimov, V.V.; Hafizov, R.R.; Kuznetsov, S.A.; Lazorskiy, P.A. Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing. Appl. Sci. 2020, 10, 3595.

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