A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating

A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating

A subwavelength fine-structured silicon−gold metagrating was designed for realizing mid-infrared (mid-IR) narrowband absorbers. The metagrating consisted of a silicon grating on the stack of a gold film and a quartz substrate. The silicon grating consisted of two periodically arranged sili...

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Main Authors: Xin He, Jinliang Jie, Junbo Yang, Yunxin Han, Sen Zhang
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Applied Sciences
Subjects:
perfect absorber
narrowband
grating
mid-infrared
Online Access:https://www.mdpi.com/2076-3417/9/23/5022
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spelling doaj-c098fa1a436648eab425199c638078422020-11-25T01:18:31ZengMDPI AGApplied Sciences2076-34172019-11-01923502210.3390/app9235022app9235022A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold MetagratingXin He0Jinliang Jie1Junbo Yang2Yunxin Han3Sen Zhang4Department of Physics, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaDepartment of Physics, National University of Defense Technology, Changsha 410073, ChinaDepartment of Physics, National University of Defense Technology, Changsha 410073, ChinaDepartment of Physics, National University of Defense Technology, Changsha 410073, ChinaA subwavelength fine-structured silicon−gold metagrating was designed for realizing mid-infrared (mid-IR) narrowband absorbers. The metagrating consisted of a silicon grating on the stack of a gold film and a quartz substrate. The silicon grating consisted of two periodically arranged silicon strips in each unit cell. The numerical results reveal that perfect absorption of the traverse-magnetic (TM) polarized light at a wavelength of 4.071 μm can be achieved, with an absorption rate of ~99.2% and an absorption full-width at half-maximum (FWHM) bandwidth of ~31 nm. Thus, the proposed structure is useful for the spectral control of mid-IR signals. When used as a refractive index sensor, the structure has a measuring range of 1.0−2.0 with a quasi linear response, with a figure of merit (FOM) of ~103.https://www.mdpi.com/2076-3417/9/23/5022perfect absorbernarrowbandgratingmid-infrared
collection DOAJ
language English
format Article
sources DOAJ
author Xin He
Jinliang Jie
Junbo Yang
Yunxin Han
Sen Zhang
spellingShingle Xin He
Jinliang Jie
Junbo Yang
Yunxin Han
Sen Zhang
A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
Applied Sciences
perfect absorber
narrowband
grating
mid-infrared
author_facet Xin He
Jinliang Jie
Junbo Yang
Yunxin Han
Sen Zhang
author_sort Xin He
title A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
title_short A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
title_full A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
title_fullStr A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
title_full_unstemmed A Mid-Infrared Narrowband Absorber Based on a Subwavelength Fine-Structured Silicon–Gold Metagrating
title_sort mid-infrared narrowband absorber based on a subwavelength fine-structured silicon–gold metagrating
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2019-11-01
description A subwavelength fine-structured silicon−gold metagrating was designed for realizing mid-infrared (mid-IR) narrowband absorbers. The metagrating consisted of a silicon grating on the stack of a gold film and a quartz substrate. The silicon grating consisted of two periodically arranged silicon strips in each unit cell. The numerical results reveal that perfect absorption of the traverse-magnetic (TM) polarized light at a wavelength of 4.071 μm can be achieved, with an absorption rate of ~99.2% and an absorption full-width at half-maximum (FWHM) bandwidth of ~31 nm. Thus, the proposed structure is useful for the spectral control of mid-IR signals. When used as a refractive index sensor, the structure has a measuring range of 1.0−2.0 with a quasi linear response, with a figure of merit (FOM) of ~103.
topic perfect absorber
narrowband
grating
mid-infrared
url https://www.mdpi.com/2076-3417/9/23/5022
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