Lopatiuk-Tirpak Olena, Fathpour Sasan
CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA.
Opt Express. 2009 Dec 21;17(26):23861-6. doi: 10.1364/OE.17.023861.
Influence of the refractive index of the surrounding material on the performance of a C-shaped subwavelength aperture is investigated. The changes in the spectral response (0.6 microm to 6 microm wavelength range) and power throughput of the aperture in an optically opaque silver (Ag) film are described for two configurations: one where the film with the aperture is immersed in an infinite dielectric slab and the other where the metallic layer is immediately adjacent to a semi-infinite dielectric substrate. It is shown that, while the resonant wavelengths increase monotonically with refractive index for both cases, the rates of these increases, as well as the behavior of the power throughput, depend not only on the configuration, but also strongly on the transmission mode. These findings have important implications for the design of subwavelength aperture-enhanced devices.
研究了周围材料的折射率对C形亚波长孔径性能的影响。针对两种配置描述了光学不透明银（Ag）膜中孔径的光谱响应（波长范围为0.6微米至6微米）和功率传输的变化：一种是带有孔径的薄膜浸入无限大的电介质平板中，另一种是金属层紧邻半无限大的电介质基板。结果表明，虽然两种情况下共振波长均随折射率单调增加，但这些增加的速率以及功率传输的行为不仅取决于配置，还强烈取决于传输模式。这些发现对亚波长孔径增强器件的设计具有重要意义。
