Efficient tuning of linearly polarized terahertz focus by graphene-integrated metasurface

被引：14
|
作者：
Ullah, Naeem [1 ]
Hu, Bin [1 ]
Khalid, Ata Ur Rahman [1 ]
Guan, Hongyu [1 ]
Khan, Muhammad Ismail [1 ,2 ]
Liu, Juan [1 ]
机构：
[1] Beijing Inst Technol, Beijing Engn Res Ctr Mixed Real & Adv Display, Sch Opt & Photon, Beijing 100081, Peoples R China
[2] COMSATS Univ Islamabad, Dept Elect Engn, Attock Campus, Attock, Pakistan
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2020年 / 53卷 / 20期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
metasurface; terahertz; graphene; Fabry-Perot cavity; METAMATERIALS; LENS; PLASMONICS; RESONATORS;
D O I：
10.1088/1361-6463/ab7623
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Graphene-integrated metasurfaces enable a new paradigm to control dynamic manipulation of electromagnetic waves from terahertz (THz) to mid-infrared. Despite the rapid growth, simultaneously achieving real-time continuous reconfigurability and high efficiency is still very challenging. To demonstrate this potential, an efficient gate-tunable tri-layer reflective metasurface (metamirror) performing like a Fabry-Perot cavity is designed for focusing linearly polarized THz radiation at 0.75 THz. The high efficiency (up to 30.4%) tuning mechanism is investigated in detail. By comparing the performance of the metamirror and a tunable bi-layer transmissive metalens, it is found that the metamirror is more compact, flexible, and efficient. Our finding is anticipated to be an ultrathin and flat platform to efficiently manipulate THz waves, which can stimulate further studies related to reconfigurable flat optics, real time imaging, and sensing.
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页数：7
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