Ultra-broadband terahertz absorption by exciting the orthogonal diffraction in dumbbell-shaped gratings

Scientific Reports
XiaoFei ZangSongLin Zhuang

Abstract

Metamaterials, artificial electromagnetic media consisting of periodical subwavelength metal-based micro-structures, were widely suggested for the absorption of terahertz (THz) waves. However, they have been suffered from the absorption of THz waves just in the single-frequency owing to its resonance features. Here, in this paper, we propose a simple periodical structure, composed of two 90 degree crossed dumbbell-shaped doped-silicon grating arrays, to demonstrate broadband THz wave absorption. Our theoretical and experimental results illustrate that THz waves can be efficiently absorbed more than 95% ranging from 0.92 THz to 2.4 THz. Such an ultra-wideband polarization-independent THz absorber is realized mainly based on the mechanisms of the anti-reflection effect together with the [±1, 0]-order and [0, ±1]-order grating diffractions. The application of our investigation can be extend to THz couplers, filters, imaging, and so on.

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Citations

Dec 24, 2018·Materials·Huafeng LiuLiangcheng Tu
May 31, 2018·Scientific Reports·Weimin LiuShengjiang Chang
Feb 29, 2020·Optics Letters·Xiaolong YouWithawat Withayachumnankul
Nov 7, 2019·Advanced Materials·Ren-Hao FanMu Wang
Dec 22, 2016·Scientific Reports·Fei DingSergey I Bozhevolnyi
Sep 8, 2016·Scientific Reports·Rafik SmaaliEmmanuel Centeno
Feb 10, 2016·Nanoscale·Sai ChenShengjiang Chang
Aug 19, 2018·Scientific Reports·Dasol LeeJunsuk Rho
May 2, 2018·Applied Optics·Jakeya SultanaDerek Abbott
Jun 6, 2019·Optics Express·Yue WangPengcheng Nie
Aug 1, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Zhuoyi ChenPengcheng Nie
Jun 12, 2020·ACS Applied Materials & Interfaces·Xiaomeng ChengXiangdong Xu

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