http://scholars.ntou.edu.tw/handle/123456789/1830
標題: | Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial | 作者: | 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 |
公開日期: | 14-七月-2017 | 出版社: | Springer Nature | 卷: | 7 | 起(迄)頁: | 5446 | 來源出版物: | Scientific Reports | 摘要: | 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/1830 | ISSN: | 2045-2322 | DOI: | 10.1038/s41598-017-05939-0 |
顯示於: | 光電與材料科技學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。