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Title: Near-Infrared Surface-Enhanced Raman Scattering based on Star-Shaped Gold/Silver Nanoparticles and Hyperbolic Metamaterial
Authors: 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
Contributors: 國立臺灣海洋大學:生命科學系
Date: 2017
Issue Date: 2018-03-21T05:44:07Z
Publisher: Scientific Reports
Abstract: 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.
Relation: 7
Appears in Collections:[Department of Life Science] Periodical Articles

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