Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Exploiting localized surface plasmon resonances in subwavelength spiral disks for THz thin film sensing. / Gerasimov, Vasily V.; Hafizov, Ruslan R.; Kuznetsov, Sergei A. и др.
в: Applied Sciences (Switzerland), Том 10, № 10, 3595, 22.05.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Exploiting localized surface plasmon resonances in subwavelength spiral disks for THz thin film sensing
AU - Gerasimov, Vasily V.
AU - Hafizov, Ruslan R.
AU - Kuznetsov, Sergei A.
AU - Lazorskiy, Pavel A.
PY - 2020/5/22
Y1 - 2020/5/22
N2 - In this paper, we studied the sensing performance of metasurfaces comprised by spiraldisk-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° Cresonator demonstrated very high figure of merit (FOM) values reaching 1670 (RIUmm)-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 (RIUmm)-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.
AB - In this paper, we studied the sensing performance of metasurfaces comprised by spiraldisk-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° Cresonator demonstrated very high figure of merit (FOM) values reaching 1670 (RIUmm)-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 (RIUmm)-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.
KW - Localized surface plasmon resonance
KW - Metasurface
KW - Terahertz
KW - Thin-film sensor
KW - WAVE
KW - localized surface plasmon resonance
KW - terahertz
KW - thin-film sensor
KW - metasurface
UR - http://www.scopus.com/inward/record.url?scp=85085627837&partnerID=8YFLogxK
U2 - 10.3390/app10103595
DO - 10.3390/app10103595
M3 - Article
AN - SCOPUS:85085627837
VL - 10
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
SN - 2076-3417
IS - 10
M1 - 3595
ER -
ID: 24397429