双极辐射近双曲超材料：有效媒质近似的适用性。

Dipole radiation near hyperbolic metamaterials: applicability of effective-medium approximation.

机构信息

Department of Physics and Institute for Optical Sciences, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada.

出版信息

Opt Lett. 2011 Jul 1;36(13):2530-2. doi: 10.1364/OL.36.002530.

DOI:10.1364/OL.36.002530

PMID:21725469

Abstract

We investigate the radiation rate of a dipole in close proximity to a hyperbolic metamaterial and confirm that both the radiation rate and its fraction directed into the metamaterial are greatly increased compared to bulk dielectric or metal. However, we find that the homogenized effective-medium approach greatly overestimates the Purcell factor compared to metal-dielectric subwavelength multilayers with previously reported layer thicknesses.

摘要

我们研究了近场 hyperbolic 超材料中偶极子的辐射率，证实与体介质或金属相比，辐射率及其进入超材料的部分大大增加。然而，我们发现与之前报道的具有相同层厚度的金属-电介质亚波长多层相比，均匀化有效媒质方法大大高估了 Purcell 因子。