Dielectric control of localized plasmons in terahertz metamaterials

被引:2
作者
Wenclawiak, Moritz [1 ]
Kainz, Martin A. [1 ]
Unterrainer, Karl [1 ]
Darmo, Juraj [1 ]
机构
[1] TU Wien, Inst Photon, Gusshausstr 27-29, A-1040 Vienna, Austria
基金
奥地利科学基金会;
关键词
Terahertz; Time domain spectroscopy; Metamaterials; Effective refractive index; META-ATOMS; LIGHT; RESONANCES; SCATTERING; RADIATION; SURFACES; GRATINGS; ARRAYS;
D O I
10.1016/j.photonics.2019.100734
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We present an experimental time-domain-spectroscopy study of the plasmonic resonance behavior of metamaterial surfaces in the terahertz regime. We determine the effective refractive index of the dielectric environment and its influence on meta-atoms built of connected dipoles. Our findings show that an analytical calculation of their resonance frequencies including higher order modes is possible and yield a method of frequency response prediction for complex meta-atom geometries. By modifying the dielectric environment, we introduce a way to control independently frequency and linewidth of the localized plasmons. Unlike the resonance frequency, which is strongly affected by a modification, the losses are robust against changes of the surrounding media. It is shown that the interaction channel between the single elements is dominantly mediated by the substrate. Our experimental findings can therefore contribute to the future conception of actively controllable complex photonic device structures.
引用
收藏
页数:5
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