https://scholars.lib.ntu.edu.tw/handle/123456789/621090
標題: | Ultrasensitive Refractive Index Sensing Based on the Quasi-Bound States in the Continuum of All-Dielectric Metasurfaces | 作者: | Hsiao H.-H. Hsu Y.-C. Liu A.-Y. Hsieh J.-C. Lin Y.-H. HUI-HSIN HSIAO |
關鍵字: | bound states in the continuum; dielectric metasurfaces; electric quadrupole; refractive-index sensing; toroidal dipole | 公開日期: | 2022 | 來源出版物: | Advanced Optical Materials | 摘要: | Symmetry-protected quasi-bound states in the continuum (BIC) controlled by metasurfaces with broken in-plane symmetry are widely exploited to achieve highly surface-sensitive and spectrally sharp resonances for nanophotonic biosensors. Through the engineering of silicon-based asymmetric nanobar pairs, a quasi-BIC mode is excited showing a dominant toroidal dipole (TD) and electric quadrupole (EQ) resonant feature in the near-infrared and performs ultrahigh sensitivity in the refractometric monitoring of local environment changes. Contrary to the typical electric and magnetic Mie-type resonances of dielectric resonators with the enhanced field mostly inside the resonator volume, the TD-EQ quasi-BIC mode is found to exhibit strong and tightly confined optical fields at the surface of tilted nanobar pairs, and its refractive-index (RI) sensitivity can be dramatically increased for nanopillars with larger aspect-ratio. The measured (simulated) sensitivity and figure of merit for nanobar pairs with a height of 450 nm reach 608 nm/RIU and 46 (612 nm/RIU and 85), respectively. Such ultrahigh sensitive all-dielectric platform can be fabricated through complementary metal-oxide-semiconductor compatible process and is promising for on-chip integration and sensor miniaturization to a wide range of diagnostic applications. © 2022 Wiley-VCH GmbH. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85135517344&doi=10.1002%2fadom.202200812&partnerID=40&md5=484a61bbc56447d7dc2de87028deb0ee https://scholars.lib.ntu.edu.tw/handle/123456789/621090 |
DOI: | 10.1002/adom.202200812 | SDG/關鍵字: | Aspect ratio; CMOS integrated circuits; Dielectric devices; Metals; MOS devices; Oxide semiconductors; Refractive index; Resonators; Bound state in the continuum; Bound-states; Continuum modes; Dielectric metasurface; Electric quadrupoles; Nanobars; Quasibound state; Refractive index sensing; Toroidal dipole; Infrared devices |
顯示於: | 工程科學及海洋工程學系 |
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