Enhanced optical transmission through a nanoslit by coupling light between periodic strips and metal film

• 来源期刊: 中国光学快报(英文版)
• 学科: 工学
• 关键词: 金属薄膜 光耦合 光学传输 周期 表面等离子体共振 等效氧化层厚度 战略石油储备 传输效率
• 年，卷（期）: 2010,（12）
• 所属期刊栏目: Diffraction and Gratings
• 页码范围: 1117-1119
• 页数: 3页
• 分类号: TN253 O484.1
• 语种: 英文

摘要

Surface plasmon resonance (SPR) is obtained by exciting the surface plasmon (SP) at the metal and dielectric interface, which can greatly enhance the extraordinary optical transmission (EOT) through a nanoslit milled in the metal film. We present a structure with a 50-nm-wide silver nanoslit for EOT by coupling light into the dielectric interlayer between periodic strips and a metal film. When the period of the metallic strips is equal to the wavelength of the SPR, the transmission efficiency of 187.6 through the nanoslit is enhanced. The metallic strip width over the nanoslit is optimized to improve transmission efficiency, and the maximal efficiency of 204.3 is achieved.