Causal homogenization of metamaterials

Nanophotonics

article

SeokJae Yoo¹  Suyeon Lee¹  Jong-Ho Choe¹  Q-Han Park¹ 

[1] Department of Physics, Korea University;Department of Physics, University of California

关键词: metamaterials;    effective medium theory;    parameter retrieval method;    causality;    homogenization;   

DOI  :  10.1515/nanoph-2019-0069

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

We propose a homogenization scheme for metamaterials that utilizes causality to determine their effective parameters. By requiring the Kramers-Kronig causality condition in the homogenization of metamaterials, we show that the effective parameters can be chosen uniquely, in contrast to the conventional parameter retrieval method which has unavoidable phase ambiguity arising from the multivalued logarithm function. We demonstrate that the effective thickness of metamaterials can also be determined to a specific value by saturating the minimum-error condition for the causality restriction. Our causal homogenization provides a robust and accurate characterization method for metamaterials.

【 授权许可】

CC BY