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

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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

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Fig. 1. (a) Schematic diagram of the proposed device. (b) Unit cell of the polarizer.

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Simulated Ruu, Rvu, and AR for EF=0 eV and N=3. (a) The amplitude (|Ruu| and |Rvu|) and phase difference (Δφ) of the reflection coefficient. (b) The AR of the reflected wave.

Fig. 2. Simulated

R_{u u}

R_{v u}

, and AR for

E_{F} = 0 eV

and

N = 3

. (a) The amplitude (

| R_{u u} |

and

| R_{v u} |

) and phase difference (

Δ φ

) of the reflection coefficient. (b) The AR of the reflected wave.

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Fig. 3. In case of

E_{F} = 0.5 eV

and

N = 3

, the amplitude of the reflection coefficient (

| R_{u u} |

and

| R_{v u} |

) and the PCR for linear polarization conversion.

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Fig. 4. AR of the reflection wave plotted as a function of

E_{F}

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Fig. 5. In case of

E_{F} = 0 eV

, the simulated

R_{u u}

R_{v u}

, and ellipticity for

N = 1, 2, and 3

. (a) The amplitudes and the phase difference of

R_{u u}

and

R_{v u}

. (b) The ellipticity.

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Fig. 6. Device performance varied with

N

. (a) The

| R_{u u} |

and

| R_{v u} |

. (b) The PCR. (c) The relationship between

V_{g}

and

E_{F}

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Fig. 7. (a), (b) The equivalent circuits of the metasurface for

x

- and

y

-polarized incident waves. (c), (d) The equivalent circuit models along the

x

and

y

directions.

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Fig. 8. (a) Resistance and (b) inductance for different

E_{F}

and

N

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Fig. 9. Simulated

S_{11}

for the equivalent circuit models and the reflective coefficients (

R_{x x}

and

R_{y y}

) simulated by CST for different

E_{F}

. (a)

E_{F} = 0 eV

and (b)

E_{F} = 0.5 eV

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	$L_{x}$ (pH)	$C_{x}$ (fF)	$R_{x} (Ω)$	$C_{y}$ (fF)	$L_{y}$ (pH)	$R_{y}$ (Ω)
Parameter ( $E_{F} = 0 eV$ )
Initial	6	0.7	0	0.09	0.1	0
Optimal	8	0.22	2.56	0.067	8.5	6
Parameter ( $E_{F} = 0.5 V$ )
Initial	6	0.7	0	0.09	0.1	0
Optimal	9	0.65	1	0.067	8.5	6

Table 1. Optimized Values of the Circuit Elements for N=3

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

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