|
原文请求
|
|
题 名：
|
Subwavelength Imaging
|
|
|
|
并列题名：
|
|
|
|
|
作 者：
|
Webb, K. J.; Liu, H.; Ludwig, A.; Schivanand, S.
|
|
|
|
作者机构：
|
Purdue Univ., West Lafayette, IN. School of Electrical and Computer Engineering.
|
|
|
|
团体作者：
|
|
|
|
|
摘 要：
|
The imaging properties of a uniaxial anisotropic slab lens, where the dielectric tensor components are of opposite sign, are studied as a function of the structure parameters. While hypothetical parameters yield various levels of performance, a design principle to achieve good sub- wavelength resolution is suggested. The anisotropy can be implemented with a metal-insulator stack. The influence of material and thickness on the subwavelength imaging performance of a negative dielectric constant slab is studied. Resonance in the plane wave transfer function produces a high spatial frequency ripple that could be useful in fabricating periodic structures. A cost function based on the plane wave transfer function provides a useful metric to evaluate the planar slab lens performance, and using this, the optimal slab dielectric constant can be determined. Prospects for a lossless negative dielectric constant material for optical devices are studied. Simulations show that with sufficient gain, a mixture of two semiconductor quantum dots can produce an isotropic effective dielectric constant that is lossless and negative. Over length scales where homogenization is meaningful, this permits a small-scale optical mode volume and lossless waveguides, major goals in the field of nanophotonics.
|
|
|
|
分 类 号：
|
|
|
|
|
关 键 词：
|
Image processing ;Optical equipment ;Planar structures ;Waveguides ;Dielectric properties ;Anisotropy ;Functions ;Quantum theory
|
|
|
|
出 版 年：
|
|
|
|
|
报 告 号：
|
|
|
NULL
|
|
ISBN：
|
NULL
|
|
|
|
ISSN：
|
NULL
|
|
|
|
页 码：
|
p.1-19
|
|
|
|
页 数：
|
19
|
|
|
|
语 种：
|
eng
|
|
|
|
馆 藏 号：
|
NTIS-ADA500587
|
|
|
|