金属光栅等离子体带边缘处的紫外表面增强拉曼散射

Ultraviolet surface-enhanced Raman scattering at the plasmonic band edge of a metallic grating.

作者信息

Mattiucci Nadia, D'Aguanno Giuseppe, Everitt Henry O, Foreman John V, Callahan John M, Buncick Milan C, Bloemer Mark J

机构信息

AEgis Tech., Nanogenesis Division, Huntsville, Alabama 35806, USA.

出版信息

Opt Express. 2012 Jan 16;20(2):1868-77. doi: 10.1364/OE.20.001868.

DOI:10.1364/OE.20.001868

PMID:22274532

Abstract

Surface-enhanced Raman Scattering (SERS) is studied in sub-wavelength metallic gratings on a substrate using a rigorous electromagnetic approach. In the ultraviolet SERS is limited by the metallic dampening, yet enhancements as large as 10(5) are predicted. It is shown that these enhancements are directly linked to the spectral position of the plasmonic band edge of the metal/substrate surface plasmon. A simple methodology is presented for selecting the grating pitch to produce optimal enhancement for a given laser frequency.

摘要

使用严格的电磁方法研究了衬底上亚波长金属光栅中的表面增强拉曼散射（SERS）。在紫外波段，SERS受到金属阻尼的限制，但预计增强倍数可达10^5。结果表明，这些增强与金属/衬底表面等离子体激元能带边缘的光谱位置直接相关。提出了一种简单的方法来选择光栅间距，以便在给定激光频率下产生最佳增强效果。