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Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film

[Image: see text] Sharp reflection dips of 50% were observed when white light was incident from the side of a cell on a 1 μm thick film of silicone oil (polydimethylsiloxane, PDMS, nearly transparent in visible light, with the extinction coefficient κ ≈ 0.0001) above a water surface in the cell so t...

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Autores principales: Hasegawa, Mayu, Oi, Junpei, Yamashita, Kyohei, Seto, Keisuke, Kobayashi, Takayoshi, Tokunaga, Eiji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10433521/
https://www.ncbi.nlm.nih.gov/pubmed/37528095
http://dx.doi.org/10.1021/acs.langmuir.3c01189
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author Hasegawa, Mayu
Oi, Junpei
Yamashita, Kyohei
Seto, Keisuke
Kobayashi, Takayoshi
Tokunaga, Eiji
author_facet Hasegawa, Mayu
Oi, Junpei
Yamashita, Kyohei
Seto, Keisuke
Kobayashi, Takayoshi
Tokunaga, Eiji
author_sort Hasegawa, Mayu
collection PubMed
description [Image: see text] Sharp reflection dips of 50% were observed when white light was incident from the side of a cell on a 1 μm thick film of silicone oil (polydimethylsiloxane, PDMS, nearly transparent in visible light, with the extinction coefficient κ ≈ 0.0001) above a water surface in the cell so that the total reflection condition was satisfied at the oil-air interface. This is the first observation of a coherent perfect absorption (CPA) phenomenon in liquid. The experimental results can be reproduced by the Fresnel reflectance of the monolayer film, but the wavelength positions at which the dip appears for s-polarized and p-polarized light are reversed if the refractive index of the oil film is assumed to be isotropic. The experimental results were correctly reproduced by assuming that the extraordinary-ray refractive index (light polarized perpendicular to the interface) is 1% larger than the ordinary-ray refractive index (light polarized parallel to the interface). This indicates that the polarization dependence of the CPA phenomenon is extremely sensitive to the difference between the in-plane and out-of-plane refractive indices of the thin film.
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spelling pubmed-104335212023-08-18 Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film Hasegawa, Mayu Oi, Junpei Yamashita, Kyohei Seto, Keisuke Kobayashi, Takayoshi Tokunaga, Eiji Langmuir [Image: see text] Sharp reflection dips of 50% were observed when white light was incident from the side of a cell on a 1 μm thick film of silicone oil (polydimethylsiloxane, PDMS, nearly transparent in visible light, with the extinction coefficient κ ≈ 0.0001) above a water surface in the cell so that the total reflection condition was satisfied at the oil-air interface. This is the first observation of a coherent perfect absorption (CPA) phenomenon in liquid. The experimental results can be reproduced by the Fresnel reflectance of the monolayer film, but the wavelength positions at which the dip appears for s-polarized and p-polarized light are reversed if the refractive index of the oil film is assumed to be isotropic. The experimental results were correctly reproduced by assuming that the extraordinary-ray refractive index (light polarized perpendicular to the interface) is 1% larger than the ordinary-ray refractive index (light polarized parallel to the interface). This indicates that the polarization dependence of the CPA phenomenon is extremely sensitive to the difference between the in-plane and out-of-plane refractive indices of the thin film. American Chemical Society 2023-08-01 /pmc/articles/PMC10433521/ /pubmed/37528095 http://dx.doi.org/10.1021/acs.langmuir.3c01189 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Hasegawa, Mayu
Oi, Junpei
Yamashita, Kyohei
Seto, Keisuke
Kobayashi, Takayoshi
Tokunaga, Eiji
Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title_full Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title_fullStr Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title_full_unstemmed Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title_short Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film
title_sort observation of coherent perfect absorption in oil film on water surface and sensitive detection of refractive index anisotropy in the film
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10433521/
https://www.ncbi.nlm.nih.gov/pubmed/37528095
http://dx.doi.org/10.1021/acs.langmuir.3c01189
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