Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer

Abstract Mid-infrared wavelengths are called the molecular fingerprint region because it contains the fundamental vibrational modes inherent to the substances of interest. Since the mid-infrared spectrum can provide non-destructive identification and quantitative analysis of unknown substances, mini...

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Autores principales:	Hwa-Seub Lee, Gyu-Weon Hwang, Tae-Yeon Seong, Jongkil Park, Jae Wook Kim, Won Mok Kim, Inho Kim, Kyeong-Seok Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cbdce869dd574835bb50285345e84abb
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spelling	oai:doaj.org-article:cbdce869dd574835bb50285345e84abb2021-12-02T17:30:40ZDesign of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer10.1038/s41598-021-91762-72045-2322https://doaj.org/article/cbdce869dd574835bb50285345e84abb2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91762-7https://doaj.org/toc/2045-2322Abstract Mid-infrared wavelengths are called the molecular fingerprint region because it contains the fundamental vibrational modes inherent to the substances of interest. Since the mid-infrared spectrum can provide non-destructive identification and quantitative analysis of unknown substances, miniaturized mid-infrared spectrometers for on-site diagnosis have attained great concern. Filter-array based on-chip spectrometer has been regarded as a promising alternative. In this study, we explore a way of applying a pillar-type plasmonic nanodiscs array, which is advantageous not only for excellent tunability of resonance wavelength but also for 2-dimensional integration through a single layer process, to the multispectral filter array for the on-chip spectrometer. We theoretically and experimentally investigated the optical properties of multi-periodic triangular lattices of metal nanodiscs array that act as stopband filters in the mid-infrared region. Soft-mold reverse nanoimprint lithography with a subsequent lift-off process was employed to fabricate the multispectral filter array and its filter function was successfully extracted using a Fourier transform infrared microscope. With the measured filter function, we tested the feasibility of target spectrum reconstruction using a Tikhonov regularization method for an ill-posed linear problem and evaluated its applicability to the infrared spectroscopic sensor that monitors an oil condition. These results not only verify that the multispectral filter array composed of stopband filters based on the metal nanodiscs array when combined with the spectrum reconstruction technique, has great potential for use to a miniaturized mid-infrared on-chip spectrometer, but also provide effective guidance for the filter design.Hwa-Seub LeeGyu-Weon HwangTae-Yeon SeongJongkil ParkJae Wook KimWon Mok KimInho KimKyeong-Seok LeeNature 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 Hwa-Seub Lee Gyu-Weon Hwang Tae-Yeon Seong Jongkil Park Jae Wook Kim Won Mok Kim Inho Kim Kyeong-Seok Lee Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
description	Abstract Mid-infrared wavelengths are called the molecular fingerprint region because it contains the fundamental vibrational modes inherent to the substances of interest. Since the mid-infrared spectrum can provide non-destructive identification and quantitative analysis of unknown substances, miniaturized mid-infrared spectrometers for on-site diagnosis have attained great concern. Filter-array based on-chip spectrometer has been regarded as a promising alternative. In this study, we explore a way of applying a pillar-type plasmonic nanodiscs array, which is advantageous not only for excellent tunability of resonance wavelength but also for 2-dimensional integration through a single layer process, to the multispectral filter array for the on-chip spectrometer. We theoretically and experimentally investigated the optical properties of multi-periodic triangular lattices of metal nanodiscs array that act as stopband filters in the mid-infrared region. Soft-mold reverse nanoimprint lithography with a subsequent lift-off process was employed to fabricate the multispectral filter array and its filter function was successfully extracted using a Fourier transform infrared microscope. With the measured filter function, we tested the feasibility of target spectrum reconstruction using a Tikhonov regularization method for an ill-posed linear problem and evaluated its applicability to the infrared spectroscopic sensor that monitors an oil condition. These results not only verify that the multispectral filter array composed of stopband filters based on the metal nanodiscs array when combined with the spectrum reconstruction technique, has great potential for use to a miniaturized mid-infrared on-chip spectrometer, but also provide effective guidance for the filter design.
format	article
author	Hwa-Seub Lee Gyu-Weon Hwang Tae-Yeon Seong Jongkil Park Jae Wook Kim Won Mok Kim Inho Kim Kyeong-Seok Lee
author_facet	Hwa-Seub Lee Gyu-Weon Hwang Tae-Yeon Seong Jongkil Park Jae Wook Kim Won Mok Kim Inho Kim Kyeong-Seok Lee
author_sort	Hwa-Seub Lee
title	Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
title_short	Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
title_full	Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
title_fullStr	Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
title_full_unstemmed	Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
title_sort	design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/cbdce869dd574835bb50285345e84abb
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Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer

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