Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping

Abstract A 900 nm thick TiO2 simple cubic photonic crystal with lattice constant 450 nm was fabricated and used to experimentally validate a newly-discovered mechanism for extreme light-bending. Absorption enhancement was observed extending 1–2 orders of magnitude over that of a reference TiO2 film....

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Autores principales:	Brian J. Frey, Ping Kuang, Mei-Li Hsieh, Jian-Hua Jiang, Sajeev John, Shawn-Yu Lin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b6f5c4c4b3214883b7fc4a449b974f38
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spelling	oai:doaj.org-article:b6f5c4c4b3214883b7fc4a449b974f382021-12-02T15:05:14ZEffectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping10.1038/s41598-017-03800-y2045-2322https://doaj.org/article/b6f5c4c4b3214883b7fc4a449b974f382017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03800-yhttps://doaj.org/toc/2045-2322Abstract A 900 nm thick TiO2 simple cubic photonic crystal with lattice constant 450 nm was fabricated and used to experimentally validate a newly-discovered mechanism for extreme light-bending. Absorption enhancement was observed extending 1–2 orders of magnitude over that of a reference TiO2 film. Several enhancement peaks in the region from 600–950 nm were identified, which far exceed both the ergodic fundamental limit and the limit based on surface-gratings, with some peaks exceeding 100 times enhancement. These results are attributed to radically sharp refraction where the optical path length approaches infinity due to the Poynting vector lying nearly parallel to the photonic crystal interface. The observed phenomena follow directly from the simple cubic symmetry of the photonic crystal, and can be achieved by integrating the light-trapping architecture into the absorbing volume. These results are not dependent on the material used, and can be applied to any future light trapping applications such as phosphor-converted white light generation, water-splitting, or thin-film solar cells, where increased response in areas of weak absorption is desired.Brian J. FreyPing KuangMei-Li HsiehJian-Hua JiangSajeev JohnShawn-Yu LinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Brian J. Frey Ping Kuang Mei-Li Hsieh Jian-Hua Jiang Sajeev John Shawn-Yu Lin Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
description	Abstract A 900 nm thick TiO2 simple cubic photonic crystal with lattice constant 450 nm was fabricated and used to experimentally validate a newly-discovered mechanism for extreme light-bending. Absorption enhancement was observed extending 1–2 orders of magnitude over that of a reference TiO2 film. Several enhancement peaks in the region from 600–950 nm were identified, which far exceed both the ergodic fundamental limit and the limit based on surface-gratings, with some peaks exceeding 100 times enhancement. These results are attributed to radically sharp refraction where the optical path length approaches infinity due to the Poynting vector lying nearly parallel to the photonic crystal interface. The observed phenomena follow directly from the simple cubic symmetry of the photonic crystal, and can be achieved by integrating the light-trapping architecture into the absorbing volume. These results are not dependent on the material used, and can be applied to any future light trapping applications such as phosphor-converted white light generation, water-splitting, or thin-film solar cells, where increased response in areas of weak absorption is desired.
format	article
author	Brian J. Frey Ping Kuang Mei-Li Hsieh Jian-Hua Jiang Sajeev John Shawn-Yu Lin
author_facet	Brian J. Frey Ping Kuang Mei-Li Hsieh Jian-Hua Jiang Sajeev John Shawn-Yu Lin
author_sort	Brian J. Frey
title	Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
title_short	Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
title_full	Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
title_fullStr	Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
title_full_unstemmed	Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
title_sort	effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b6f5c4c4b3214883b7fc4a449b974f38
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Effectively infinite optical path-length created using a simple cubic photonic crystal for extreme light trapping

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