A comprehensive study of tunable properties of broadband terahertz absorber based on graphene-embedded random photonic crystals

被引：7

作者：

Mahesh, Pulimi ^{[1
]}

Panigrahy, Damodar ^{[1
]}

Nayak, Chittaranjan ^{[2
]}

机构：

[1] SRM Inst Sci & Technol, Coll Engn & Technol, Dept Elect & Commun Engn, Chennai 603203, TN, India

[2] Vellore Inst Technol, Sch Elect Engn, Dept Commun Engn, Vellore 632014, India

来源：

PHYSICA B-CONDENSED MATTER | 2023年 / 650卷

关键词：

Graphene; Random photonic structure; Resonate modes; Tunable broadband absorption; Magneto -optic effect; ABSORPTION; METAL;

D O I：

10.1016/j.physb.2022.414581

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In the current study, we have explored the broadband absorption characteristics of graphene-layered random photonic crystals by the 4 x 4 characteristic matrix method. The findings confirm that under the influence of magnetic field B, optimal semi-random photonic crystals are capable of providing broadband absorption with a value greater than 84% in the wavelength range of 74.8-85.57 mu m. The absorption band is tuned to desired frequencies by appropriate selection of the thickness of the silicon carbide layer. An absorption and FWHM enhancement with respect to the number of layers in each elementary unit, Fermi-level, and period number are numarically revealed. The application of a positive magnetic field minimises fluctuations and enhances the FWHM value in the desired absorption band for LCP waves, whereas the converse is true for RCP waves. The proposed absorber has applications in polarization selective absorbers, sensors and terahertz imaging.

引用

页数：7