Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer

Abstract We demonstrate an infrared broadband metasurface absorber that is suitable for increasing the response speed of a microbolometer by reducing its thermal mass. A large fraction of holes are made in a periodic pattern on a thin lossy metal layer characterised with a non-dispersive effective s...

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Autores principales:	Joo-Yun Jung, Kyungjun Song, Jun-Hyuk Choi, Jihye Lee, Dae-Geun Choi, Jun-Ho Jeong, Dean P. Neikirk
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7efc847afa8e46e2b120463d4edfe63b
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spelling	oai:doaj.org-article:7efc847afa8e46e2b120463d4edfe63b2021-12-02T15:05:10ZInfrared broadband metasurface absorber for reducing the thermal mass of a microbolometer10.1038/s41598-017-00586-x2045-2322https://doaj.org/article/7efc847afa8e46e2b120463d4edfe63b2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00586-xhttps://doaj.org/toc/2045-2322Abstract We demonstrate an infrared broadband metasurface absorber that is suitable for increasing the response speed of a microbolometer by reducing its thermal mass. A large fraction of holes are made in a periodic pattern on a thin lossy metal layer characterised with a non-dispersive effective surface impedance. This can be used as a non-resonant metasurface that can be integrated with a Salisbury screen absorber to construct an absorbing membrane for a microbolometer that can significantly reduce the thermal mass while maintaining high infrared broadband absorption in the long wavelength infrared (LWIR) band. The non-dispersive effective surface impedance can be matched to the free space by optimising the surface resistance of the thin lossy metal layer depending on the size of the patterned holes by using a dc approximation method. In experiments a high broadband absorption was maintained even when the fill factor of the absorbing area was reduced to 28% (hole area: 72%), and it was theoretically maintained even when the fill factor of the absorbing area was reduced to 19% (hole area: 81%). Therefore, a metasurface with a non-dispersive effective surface impedance is a promising solution for reducing the thermal mass of infrared microbolometer pixels.Joo-Yun JungKyungjun SongJun-Hyuk ChoiJihye LeeDae-Geun ChoiJun-Ho JeongDean P. NeikirkNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Joo-Yun Jung Kyungjun Song Jun-Hyuk Choi Jihye Lee Dae-Geun Choi Jun-Ho Jeong Dean P. Neikirk Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
description	Abstract We demonstrate an infrared broadband metasurface absorber that is suitable for increasing the response speed of a microbolometer by reducing its thermal mass. A large fraction of holes are made in a periodic pattern on a thin lossy metal layer characterised with a non-dispersive effective surface impedance. This can be used as a non-resonant metasurface that can be integrated with a Salisbury screen absorber to construct an absorbing membrane for a microbolometer that can significantly reduce the thermal mass while maintaining high infrared broadband absorption in the long wavelength infrared (LWIR) band. The non-dispersive effective surface impedance can be matched to the free space by optimising the surface resistance of the thin lossy metal layer depending on the size of the patterned holes by using a dc approximation method. In experiments a high broadband absorption was maintained even when the fill factor of the absorbing area was reduced to 28% (hole area: 72%), and it was theoretically maintained even when the fill factor of the absorbing area was reduced to 19% (hole area: 81%). Therefore, a metasurface with a non-dispersive effective surface impedance is a promising solution for reducing the thermal mass of infrared microbolometer pixels.
format	article
author	Joo-Yun Jung Kyungjun Song Jun-Hyuk Choi Jihye Lee Dae-Geun Choi Jun-Ho Jeong Dean P. Neikirk
author_facet	Joo-Yun Jung Kyungjun Song Jun-Hyuk Choi Jihye Lee Dae-Geun Choi Jun-Ho Jeong Dean P. Neikirk
author_sort	Joo-Yun Jung
title	Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
title_short	Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
title_full	Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
title_fullStr	Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
title_full_unstemmed	Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
title_sort	infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/7efc847afa8e46e2b120463d4edfe63b
work_keys_str_mv	AT jooyunjung infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT kyungjunsong infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT junhyukchoi infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT jihyelee infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT daegeunchoi infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT junhojeong infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer AT deanpneikirk infraredbroadbandmetasurfaceabsorberforreducingthethermalmassofamicrobolometer
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Infrared broadband metasurface absorber for reducing the thermal mass of a microbolometer

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