Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial

Abstract It is desirable to extend the surface-enhanced Raman scattering (SERS) from the conventionally used visible range into the infrared region, because the fluorescence background is lower in the long-wavelength regime. To do this, it is important to have a SERS substrate suitable for infrared...

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Autores principales:	Chih-Hsien Lai, Guo-An Wang, Tsung-Kai Ling, Tzyy-Jiann Wang, Po-kai Chiu, Yuan-Fong Chou Chau, Chih-Ching Huang, Hai-Pang Chiang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d7377fb2c7704d2082a0860d7cd94c23
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spelling	oai:doaj.org-article:d7377fb2c7704d2082a0860d7cd94c232021-12-02T11:40:12ZNear infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial10.1038/s41598-017-05939-02045-2322https://doaj.org/article/d7377fb2c7704d2082a0860d7cd94c232017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05939-0https://doaj.org/toc/2045-2322Abstract It is desirable to extend the surface-enhanced Raman scattering (SERS) from the conventionally used visible range into the infrared region, because the fluorescence background is lower in the long-wavelength regime. To do this, it is important to have a SERS substrate suitable for infrared operation. In this work, we report the near infrared SERS operation based on the substrates employing star-shaped gold/silver nanoparticles and hyperbolic metamaterial (HMM) structure. We first fabricate the SERS substrate in which nanoparticles are separated from a silver film by a thin dielectric layer. Performance of the SERS substrate is investigated with a 1064-nm excitation source. Compared with similar silver film-based substrates employing respectively gold and silver spherical nanoparticles, it is found that, Raman intensity scattered by the substrate with star-shaped nanoparticles is 7.4 times stronger than that with gold nanoparticles, and 3.4 times stronger than that with silver nanoparticles. Following this, we fabricate the SERS substrate where the star-shaped nanoparticles are deposited over a HMM structure. The HMM structure comprises three pairs of germanium-silver multilayers. Further experimental result shows that, with the star-shaped nanoparticles, the HMM-based substrate yields 30% higher Raman intensity for near infrared SERS operation than the silver film-based substrate does.Chih-Hsien LaiGuo-An WangTsung-Kai LingTzyy-Jiann WangPo-kai ChiuYuan-Fong Chou ChauChih-Ching HuangHai-Pang ChiangNature 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 Chih-Hsien Lai Guo-An Wang Tsung-Kai Ling Tzyy-Jiann Wang Po-kai Chiu Yuan-Fong Chou Chau Chih-Ching Huang Hai-Pang Chiang Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
description	Abstract It is desirable to extend the surface-enhanced Raman scattering (SERS) from the conventionally used visible range into the infrared region, because the fluorescence background is lower in the long-wavelength regime. To do this, it is important to have a SERS substrate suitable for infrared operation. In this work, we report the near infrared SERS operation based on the substrates employing star-shaped gold/silver nanoparticles and hyperbolic metamaterial (HMM) structure. We first fabricate the SERS substrate in which nanoparticles are separated from a silver film by a thin dielectric layer. Performance of the SERS substrate is investigated with a 1064-nm excitation source. Compared with similar silver film-based substrates employing respectively gold and silver spherical nanoparticles, it is found that, Raman intensity scattered by the substrate with star-shaped nanoparticles is 7.4 times stronger than that with gold nanoparticles, and 3.4 times stronger than that with silver nanoparticles. Following this, we fabricate the SERS substrate where the star-shaped nanoparticles are deposited over a HMM structure. The HMM structure comprises three pairs of germanium-silver multilayers. Further experimental result shows that, with the star-shaped nanoparticles, the HMM-based substrate yields 30% higher Raman intensity for near infrared SERS operation than the silver film-based substrate does.
format	article
author	Chih-Hsien Lai Guo-An Wang Tsung-Kai Ling Tzyy-Jiann Wang Po-kai Chiu Yuan-Fong Chou Chau Chih-Ching Huang Hai-Pang Chiang
author_facet	Chih-Hsien Lai Guo-An Wang Tsung-Kai Ling Tzyy-Jiann Wang Po-kai Chiu Yuan-Fong Chou Chau Chih-Ching Huang Hai-Pang Chiang
author_sort	Chih-Hsien Lai
title	Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
title_short	Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
title_full	Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
title_fullStr	Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
title_full_unstemmed	Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
title_sort	near infrared surface-enhanced raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d7377fb2c7704d2082a0860d7cd94c23
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Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial

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