A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface

Junxiang Huang; Tao Fu; Haiou Li; Zhaoyu Shou; Xi Gao

doi:10.3788/COL202018.013102

Journals >Chinese Optics Letters >Volume 18 >Issue 1 >Page 013102 > Article

Chinese Optics Letters
Vol. 18, Issue 1, 013102 (2020)

A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface

Junxiang Huang¹, Tao Fu¹, Haiou Li¹, Zhaoyu Shou¹, and Xi Gao^1、2、*

Author Affiliations

¹School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China

²Key Laboratory of THz Technology, Ministry of Education, Chengdu 610054, China

show less

DOI: 10.3788/COL202018.013102 Cite this Article Set citation alerts

Junxiang Huang, Tao Fu, Haiou Li, Zhaoyu Shou, Xi Gao. A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface[J]. Chinese Optics Letters, 2020, 18(1): 013102 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Abstract

A metal–graphene hybrid metasurface polarization converter is designed in this Letter. The unit cell of the hybrid metasurface is composed of a butterfly-shaped structure whose branches are connected by multi-layer graphene sheets. The proposed device can be reconfigured from linear-to-circular polarization to cross-polarization by changing the Fermi energy of graphene. The simulation results show that for three-layer graphene, the device acts as a linear-to-circular polarization converter when E_F = 0 eV and switches to a cross-polarization converter when E_F = 0.5 eV. Compared with single-layer graphene, the device with three-layer graphene can maintain the cross-polarization conversion performance under low Fermi energy. Furthermore, two equivalent circuits in the x and y directions are developed to understand the working mechanism of the device.

Keywords

graphene metasurface polarization converter THz

S_{0} = {| R_{u u} |}^{2} + {| R_{v u} |}^{2},

(1)

View in Article

S_{1} = {| R_{u u} |}^{2} - {| R_{v u} |}^{2},

(2)

View in Article

S_{2} = 2 | R_{u u} | | R_{v u} | \cos (Δ φ),

(3)

View in Article

S_{3} = 2 | R_{u u} | | R_{v u} | \sin (Δ φ) .

(4)

View in Article

Z_{i n}^{x} = {R + j ω L_{x} + [\frac{1}{j ω C_{x}} / / (j ω L_{g} + R_{g})]} / / j Z_{d} \tan (k_{d} t),

(5)

View in Article

Z_{i n}^{y} = (R + j ω L_{y} + \frac{1}{j ω C_{y}}) / / j Z_{d} \tan (k_{d} t),

(6)

View in Article

L_{x, y} = \frac{μ_{0} P}{2 π} \ln [1 / \sin (\frac{π W}{2 P})],

(7)

View in Article

C_{x, y} = \frac{2 ε_{0} ε_{eff} P}{π} \ln [1 / \sin (\frac{π g}{2 P})],

(8)

View in Article

Z_{g} = \frac{g}{- j ω ε_{0} ε_{g} L_{2} d_{g}},

(9)

View in Article

Junxiang Huang, Tao Fu, Haiou Li, Zhaoyu Shou, Xi Gao. A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface[J]. Chinese Optics Letters, 2020, 18(1): 013102

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information