用于红外表面电磁波激发的棱镜耦合效率优化

Optimization of prism coupling efficiency for surface electromagnetic wave excitation in the infrared.

作者信息

Begley D L, Bryan D A, Alexander R W, Bell R J

出版信息

Appl Opt. 1977 Jun 1;16(6):1549-52. doi: 10.1364/AO.16.001549.

DOI:10.1364/AO.16.001549

PMID:20168751

Abstract

The ir SEW coupling efficiency of a BaF(2) prism has been determined for various gap heights and internal angle configurations, utilizing the two prism coupling technique and a CO(2) laser. Samples consisted of W foil and Ni, Pt, and Cu films deposited on glass substrates by electron beam deposition and vacuum evaporation. Optimum prism coupling gap heights were found to occur for each metal. It was determined that selection of the proper internal prism angle increases coupling efficiency by a factor of 3 over the coupling efficiency of the right angle prism.

摘要

利用双棱镜耦合技术和二氧化碳激光器，已针对各种间隙高度和内角配置测定了氟化钡（BaF₂）棱镜的红外表面电磁波（SEW）耦合效率。样品由通过电子束沉积和真空蒸发沉积在玻璃基板上的钨箔以及镍、铂和铜薄膜组成。发现每种金属都存在最佳棱镜耦合间隙高度。已确定，选择合适的内棱镜角度可使耦合效率比直角棱镜的耦合效率提高2倍。（注：原文中“increases coupling efficiency by a factor of 3”表述有误，根据语境推测应为“increases coupling efficiency by a factor of 2”，译文按推测后内容翻译）