用于色散辅助定向光发射的双曲超材料。

Hyperbolic metamaterials for dispersion-assisted directional light emission.

机构信息

Materials Science and Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0418, USA.

出版信息

Nanoscale. 2017 Jul 6;9(26):9034-9048. doi: 10.1039/c7nr00980a.

DOI:10.1039/c7nr00980a

PMID:28639636

Abstract

A novel method is presented to outcouple high spatial frequency (large-k) waves from hyperbolic metamaterials (HMMs) without the use of a grating. This approach relies exclusively on dispersion engineering, and enables preferential power extraction from the top or from the side of a HMM. Multilayer (ML) HMMs are shown to be better suited for lateral outcoupling, while nanowire HMMs are the most convenient choice for top outcoupling. A 6-fold increase in laterally extracted power is predicted for a dipole-HMM system with a Ag/Si ML operating at λ = 530 nm, when metallic filling ratio is changed from an unoptimized to the optimized one. This new design concept supports the cost-effective mass production of high-speed HMM optical transmitters.

摘要

提出了一种新的方法，可在不使用光栅的情况下从双曲超材料（HMM）中取出高空间频率（大 k）波。该方法完全依赖于色散工程，可优先从 HMM 的顶部或侧面提取功率。结果表明，多层（ML）HMM 更适合于侧向取出，而纳米线 HMM 则是顶部取出的最佳选择。对于在 λ = 530nm 处工作的 Ag/Si ML 偶极子-HMM 系统，当金属填充率从非优化变为优化时，预测侧向提取的功率将增加 6 倍。这种新的设计理念支持高速 HMM 光发射器的经济高效批量生产。