Bilaterally asymmetric reflection and transmission of light by a grating structure containing a topological insulator

被引：4

作者：

Diovisalvi, Annunziata ^{[1
,2
]}

Lakhtakia, Akhlesh ^{[1
]}

Fiumara, Vincenzo ^{[2
]}

Chiadini, Francesco ^{[3
]}

机构：

[1] Penn State Univ, NanoMM Nanoengn Metamat Grp, Dept Engn Sci & Mech, University Pk, PA 16802 USA

[2] Univ Basilicata, Sch Engn, Viale Ateneo Lucano 10, I-85100 Potenza, Italy

[3] Univ Salerno, Dept Ind Engn, Via Giovanni Paolo 2 132, I-84084 Fisciano, SA, Italy

来源：

OPTICS COMMUNICATIONS | 2017年 / 398卷

关键词：

Columnar thin film; Floquet harmonics; Rigorous coupled-wave approach; Superlattice; Topological insulator; REFRACTIVE-INDEXES; SCATTERING; MEDIA; FILMS;

D O I：

10.1016/j.optcom.2017.04.017

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A boundary-value problem was formulated to investigate the reflection and transmission of light by a device consisting of an orthorhombic dielectric material that sits atop a 1D grating and is coated with a 3D topological insulator. In view of the periodicity of the grating, the electromagnetic field phasors were represented in terms of Floquet harmonics and the analysis was conducted by using the rigorous coupled-wave approach. We found that the device can exhibit bilaterally asymmetric reflection and transmission in the mid-infrared wavelength regime, provided that the surface admittance of the topological insulator is sufficiently high. This bilateral asymmetry is exhibited in narrow regimes for both the free-space wavelength and the angle of incidence. Bilateral asymmetry is exhibited more significantly by the specular components than by the nonspecular components of the reflected and transmitted plane waves.

引用

页码：67 / 76

页数：10