Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film 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 o...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-05-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/10/10/3595 |
| _version_ | 1827716364559712256 |
|---|---|
| author | Vasily V. Gerasimov Ruslan R. Hafizov Sergei A. Kuznetsov Pavel A. Lazorskiy |
| author_facet | Vasily V. Gerasimov Ruslan R. Hafizov Sergei A. Kuznetsov Pavel A. Lazorskiy |
| author_sort | Vasily V. Gerasimov |
| collection | DOAJ |
| description | 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 (<i>d</i> ~ 10<sup>−4</sup>–10<sup>−3</sup> λ) showed good agreement with the simulations. The resonance frequency shift Δ<i>f</i> increases with increasing <i>d</i>, while saturating near <i>d</i> = 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)<sup>−1</sup> 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)<sup>−1</sup>) 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. |
| first_indexed | 2024-03-10T19:38:30Z |
| format | Article |
| id | doaj.art-40e6f8de6d634fa9a33ced27191a54ff |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:38:30Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-40e6f8de6d634fa9a33ced27191a54ff2023-11-20T01:24:53ZengMDPI AGApplied Sciences2076-34172020-05-011010359510.3390/app10103595Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film SensingVasily V. Gerasimov0Ruslan R. Hafizov1Sergei A. Kuznetsov2Pavel A. Lazorskiy3Budker Institute of Nuclear Physics SB RAS, 11, Ac. Lavrentiev Ave., Novosibirsk 630090, RussiaBudker Institute of Nuclear Physics SB RAS, 11, Ac. Lavrentiev Ave., Novosibirsk 630090, RussiaBudker Institute of Nuclear Physics SB RAS, 11, Ac. Lavrentiev Ave., Novosibirsk 630090, RussiaAnalytical and Technological Research Center, Novosibirsk State University, 2, Pirogov St., Novosibirsk 630090, RussiaIn 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 (<i>d</i> ~ 10<sup>−4</sup>–10<sup>−3</sup> λ) showed good agreement with the simulations. The resonance frequency shift Δ<i>f</i> increases with increasing <i>d</i>, while saturating near <i>d</i> = 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)<sup>−1</sup> 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)<sup>−1</sup>) 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.https://www.mdpi.com/2076-3417/10/10/3595metasurfacelocalized surface plasmon resonancethin-film sensorterahertz |
| spellingShingle | Vasily V. Gerasimov Ruslan R. Hafizov Sergei A. Kuznetsov Pavel A. Lazorskiy Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing Applied Sciences metasurface localized surface plasmon resonance thin-film sensor terahertz |
| title | Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing |
| title_full | Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing |
| title_fullStr | Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing |
| title_full_unstemmed | Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing |
| title_short | Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing |
| title_sort | exploiting localized surface plasmon resonances in subwavelength spiral disks for thz thin film sensing |
| topic | metasurface localized surface plasmon resonance thin-film sensor terahertz |
| url | https://www.mdpi.com/2076-3417/10/10/3595 |
| work_keys_str_mv | AT vasilyvgerasimov exploitinglocalizedsurfaceplasmonresonancesinsubwavelengthspiraldisksforthzthinfilmsensing AT ruslanrhafizov exploitinglocalizedsurfaceplasmonresonancesinsubwavelengthspiraldisksforthzthinfilmsensing AT sergeiakuznetsov exploitinglocalizedsurfaceplasmonresonancesinsubwavelengthspiraldisksforthzthinfilmsensing AT pavelalazorskiy exploitinglocalizedsurfaceplasmonresonancesinsubwavelengthspiraldisksforthzthinfilmsensing |