Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing

Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing

Abstract Perfect absorption at a resonance wavelength and extremely low absorption at the wavelength range of off-resonance in a one-port optical cavity is required for refractive index (RI) sensing with high signal contrast. Here, we propose and analyze an absorption-enhanced Fabry–Perot (MAFP) cav...

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Autores principales: Gyeong Cheol Park, Kwangwook Park
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
Materias:
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R
Science
Q
Acceso en línea:https://doaj.org/article/2761041af9d34f66997de7fb23147620
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spelling oai:doaj.org-article:2761041af9d34f66997de7fb231476202021-12-02T19:17:05ZCritically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing10.1038/s41598-021-98654-w2045-2322https://doaj.org/article/2761041af9d34f66997de7fb231476202021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98654-whttps://doaj.org/toc/2045-2322Abstract Perfect absorption at a resonance wavelength and extremely low absorption at the wavelength range of off-resonance in a one-port optical cavity is required for refractive index (RI) sensing with high signal contrast. Here, we propose and analyze an absorption-enhanced Fabry–Perot (MAFP) cavity based on a critical coupling condition in a near-infrared wavelength range. For a one-port cavity, a thick bottom Au is used as a mirror and an absorber. To achieve the critical coupling condition, a top dielectric metasurface is employed and tailored to balance the radiation coupling and the absorption coupling rates, and the one-port cavity is theoretically analyzed using temporal coupled-mode theory. We investigate two types of MAFP structures for gas and liquid. The gas MAFP cavity shows a sensitivity of ~ 1388 nm/RIU and a full-width at half-maximum of less than 0.7 nm. This MAFP cavity resolves the RI change of 5 × 10−4 with a reflectance signal margin of 50% and achieves a signal contrast of ~ 100%. The liquid MAFP cavity shows a sensitivity of ~ 996 nm/RIU when RI of liquid changes from 1.30 to 1.38. With tailoring the period of the metasurface maintaining its thickness, a signal contrast of ~ 100% is achieved for each specific RI range.Gyeong Cheol ParkKwangwook ParkNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Gyeong Cheol Park
Kwangwook Park
Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
description Abstract Perfect absorption at a resonance wavelength and extremely low absorption at the wavelength range of off-resonance in a one-port optical cavity is required for refractive index (RI) sensing with high signal contrast. Here, we propose and analyze an absorption-enhanced Fabry–Perot (MAFP) cavity based on a critical coupling condition in a near-infrared wavelength range. For a one-port cavity, a thick bottom Au is used as a mirror and an absorber. To achieve the critical coupling condition, a top dielectric metasurface is employed and tailored to balance the radiation coupling and the absorption coupling rates, and the one-port cavity is theoretically analyzed using temporal coupled-mode theory. We investigate two types of MAFP structures for gas and liquid. The gas MAFP cavity shows a sensitivity of ~ 1388 nm/RIU and a full-width at half-maximum of less than 0.7 nm. This MAFP cavity resolves the RI change of 5 × 10−4 with a reflectance signal margin of 50% and achieves a signal contrast of ~ 100%. The liquid MAFP cavity shows a sensitivity of ~ 996 nm/RIU when RI of liquid changes from 1.30 to 1.38. With tailoring the period of the metasurface maintaining its thickness, a signal contrast of ~ 100% is achieved for each specific RI range.
format article
author Gyeong Cheol Park
Kwangwook Park
author_facet Gyeong Cheol Park
Kwangwook Park
author_sort Gyeong Cheol Park
title Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
title_short Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
title_full Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
title_fullStr Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
title_full_unstemmed Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
title_sort critically coupled fabry–perot cavity with high signal contrast for refractive index sensing
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/2761041af9d34f66997de7fb23147620
work_keys_str_mv AT gyeongcheolpark criticallycoupledfabryperotcavitywithhighsignalcontrastforrefractiveindexsensing
AT kwangwookpark criticallycoupledfabryperotcavitywithhighsignalcontrastforrefractiveindexsensing
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