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Hole arrayed metal-insulator-metal structure for surface enhanced Raman scattering by self-assembling polystyrene spheres
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Update time: 2014-03-27
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Liang-Ping Xia , Zheng Yang , Shao-Yun Yin , Wen-Rui Guo , Jing-Lei Du , Chun-Lei Du

Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China

Institute of Optics and Electronics, Chinese Academy of Sciences, P. O. Box 350, Chengdu 610209, China

Physics Department, Sichuan University, Chengdu 610064, China

Abstract

A fabrication process based on the self-assembling polystyrene spheres is proposed to obtain hole arrayed metal-insulator-metal (HA-MIM) structure for surface enhanced Raman scattering (SERS). The localized field enhancement aroused by the gap resonance in the HA-MIM structure is analyzed by finite-different time domain (FDTD) method. Withreference to the theory result, the structure is experimentally fabricated and the Raman scattering spectrum of rhodamine 6G (R6G) is measured by a miniaturized Raman spectrometer. The results shows that the enhancement factor is 3.85 times higher than the control sample with single layered metal hole array. The fabrication process to obtain the HA-MIM SERS substrate is reproducible, fast, large area and low cost.

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