Ultra-wideband transmission filter based on guided-mode resonances in two terahertz metasurfaces

This paper reports on a broadband transmission filter that employs the guided mode resonances pertaining to a terahertz metasurface composed of metallic gold disks with a quartz slab. Unlike structures involving conventional metasurfaces, two identical metasurfaces are placed on the upper and lower...

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Veröffentlicht in:Optics express 2022-11, Vol.30 (23), p.42738-42748
Hauptverfasser: Kim, Tae-Han, Kim, Seontae, Jeon, Young Pyo, Ahn, Ji Hun, Lee, Bo Wha, Park, Gun-Sik, Park, Jaehun, Kim, Young Ju, Park, Sang Yoon, Yoo, Young Joon
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Sprache:eng
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Zusammenfassung:This paper reports on a broadband transmission filter that employs the guided mode resonances pertaining to a terahertz metasurface composed of metallic gold disks with a quartz slab. Unlike structures involving conventional metasurfaces, two identical metasurfaces are placed on the upper and lower sides of a thick quartz slab. This structure can excite both even and odd guided mode resonances. The interaction of the two resonances at similar frequencies produces a broadband transmission peak. The sharp spectral feature of each resonance leads to the abrupt degradation of the transmission at the spectral edge, which can enable the development of the filter application. The proposed scheme can facilitate practical applications such as those of broadband filters at a terahertz frequency.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.474537