High-efficiency and tunable circular dichroism in chiral graphene metasurface

被引：33

作者：

Cui, Ying ^{[1
]}

Wang, Xiaosai ^{[1
]}

Jiang, Huan ^{[2
]}

Jiang, Yongyuan ^{[1
,3
,4
,5
]}

机构：

[1] Harbin Inst Technol, Sch Phys, Harbin 150001, Peoples R China

[2] Guangdong Univ Technol, Sch Phys & Optoelect Engn, Guangzhou 510006, Peoples R China

[3] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China

[4] Key Lab Micro Opt & Photon Technol Heilongjiang, Harbin 150001, Peoples R China

[5] Minist Ind & Informat Technol, Key Lab Micronano Optoelect Informat Syst, Harbin 150001, Peoples R China

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2022年 / 55卷 / 13期

基金：

中国国家自然科学基金;

关键词：

chiral metasurface; high-efficiency circular dichroism; tunable; ABSORPTION; MOLECULES;

D O I：

10.1088/1361-6463/ac4450

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Circular dichroism (CD) response is extremely important for dynamic polarization control, chiral molecular sensing and imaging, etc. Here, we numerically demonstrated high-efficiency and tunable CD using a symmetry broken graphene-dielectric-metal composite microstructure. By introducing slot patterns in graphene ribbons, the metasurface exhibits giant polarization-selective absorption for circularly polarized (CP) wave excitations. The maximum CD reaches 0.87 at 2.78 THz, which originates from the localized surface plasmon resonances in patterned graphene. Besides, the operating frequency and magnitude of CD are dynamically manipulated by gating graphene's Fermi energies. The proposed chiral graphene metasurface with high-efficiency and tunable capability paves a way to the design of active CD metasurfaces.

引用

页数：9

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