欧米茄
折射率
物理
介电常数
符号(数学)
负折射
负指数超材料
光学
左撇子
凝聚态物理
光电子学
量子力学
电介质
数学分析
数学
作者
David Smith,Norman M. Kroll
标识
DOI:10.1103/physrevlett.85.2933
摘要
The real part of the refractive index n(omega) of a nearly transparent and passive medium is usually taken to have only positive values. Through an analysis of a current source radiating into a 1D "left-handed" material (LHM)-where the permittivity and permeability are simultaneously less than zero-we determine the analytic structure of n(omega), demonstrating frequency regions where the sign of Re[n(omega)] must, in fact, be negative. The regime of negative index, made relevant by a recent demonstration of an effective LHM, leads to unusual electromagnetic wave propagation and merits further exploration.
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