Open AccessElectrically controlled Mie-resonance absorber
Author(s) -
Jinwu Gao,
Chuwen Lan,
Qian Zhao,
Bo Li,
Ji Zhou
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.022658
Subject(s) - materials science , metamaterial , permittivity , optics , resonance (particle physics) , cloaking , mie scattering , cube (algebra) , absorption (acoustics) , refractive index , dielectric , optoelectronics , bandwidth (computing) , ceramic , metamaterial absorber , tunable metamaterials , composite material , telecommunications , scattering , light scattering , computer science , physics , mathematics , particle physics , combinatorics
An electrically controlled metamaterial perfect absorber (MPA) based on Mie resonance is demonstrated experimentally and modeled numerically. A ceramic dielectric cube is adhered to a specially shaped thin copper film sputtered on a quartz plate. By passing direct current (DC) through the film, the temperature of the cube can be varied, resulting in changing the cube's permittivity and shifting the absorption resonance frequency. The frequency increases on heating and the absorption is over 99% throughout the tuning range. This method for constructing miniaturized tunable MPAs compares favorably to bulky alternative designs. It also provides a versatile route to broaden the absorption bandwidth and potentially expand the range of applications such as metasurfaces and cloaking devices utilizing nonuniform permittivity absorbers produced by temperature gradients.