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

Chinese Optics Letters, Volume. 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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Figures & Tables(10)

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

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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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Table 1. Optimized Values of the Circuit Elements for N=3
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Table 1. Optimized Values of the Circuit Elements for N=3
$L_{x}$ (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

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Junxiang Huang, Tao Fu, Haiou Li, Zhaoyu Shou, Xi Gao, "A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface," Chin.Opt.Lett. 18, 013102 (2020)

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