中国激光, 2020, 47 (9): 0903001, 网络出版: 2020-09-16
基于混合石墨烯-二氧化钒超材料的太赫兹可调宽带吸收器 
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Broadband Tunable Terahertz Absorber Based on Hybrid Graphene-Vanadium Dioxide Metamaterials
图 & 表
图 1. 基于混合石墨烯-二氧化钒超材料的太赫兹宽带吸收器的几何形状示意图。(a)单元结构的侧视图;(b)单元结构的俯视图
Fig. 1. Schematic of hybrid graphene-vanadium dioxide based metamaterial terahertz broadband absorber geometry. (a) Perspective view of the unit cell; (b) top view of the unit cell
图 2. 所设计的宽带吸收器的吸收光谱及其相对阻抗的实部和虚部
Fig. 2. Absorption spectra of the proposed absorber and real and imaginary parts of the relative impedance
图 3. 电磁波垂直入射时,所设计的宽带吸收器在1.87 THz和2.98 THz处的表面电流分布(Ef=0.7 eV,二氧化钒的电导率为200000 S/m)。(a)顶层;(b)底层
Fig. 3. Surface current distribution of the proposed broadband absorber at 1.87 THz and 2.98 THz, respectively (Ef=0.7 eV, σ(VO2)=200000 S/m). (a) Top layer; (b) bottom layer
图 4. 石墨烯表面阻抗的实部和虚部以及所设计宽带吸收器的吸收光谱。(a)表面阻抗的实部;(b)表面阻抗的虚部;(c)吸收光谱
Fig. 4. Real and imaginary parts of surface impedance of graphene, and the absorption spectra of the designed broadband absorber. (a) Real part of surface impedance; (b) imaginary part of surface impedance; (c) absorption spectra
图 5. 不同电导率下二氧化钒介电常数的实部、虚部以及二氧化钒材料的吸收光谱。(a)实部;(b)虚部;(c)吸收光谱
Fig. 5. Real and imaginary parts of permittivity of vanadium dioxide at different conductivities, and the absorption spectra of vanadium dioxide. (a) Real part; (b) imaginary part; (c) absorption spectra
图 6. 不同电导率下宽带吸收器相对阻抗的实部和虚部。(a)实部;(b)虚部
Fig. 6. Real and imaginary parts of the relative impedance of broadband absorber at different conductivities. (a) Real part; (b) imaginary part
图 7. 所设计的宽带吸收器在不同的费米能级和二氧化钒电导率下的模拟吸收光谱以及宽带吸收器在2.98 THz处的电场强度分布侧视图。(a)吸收光谱;(b)电场强度分布侧视图
Fig. 7. Simulated absorption spectra of the proposed broadband absorber at different Fermi energies and conductivities of vanadium dioxide, and the side view of the electric field intensity of broadband absorber at 2.98 THz. (a) Absorption spectra; (b) side view of the electric field intensity
图 8. 吸收光谱以及反射和透射曲线。(a)自由空间中图案化和未经图案化单层石墨烯的吸收光谱;(b) ToPaS介质层的反射和透射曲线;(c) ToPaS-二氧化钒结构的吸收光谱;(d)所设计的宽带吸收器的石墨烯层图案化处理前后的吸收光谱
Fig. 8. Absorption spectra and reflection and transmission curves. (a) Absorption spectra of single-layer graphene with and without the pattern in the free space; (b) reflection and transmission curves of the ToPaS layer; (c) absorption spectrum of ToPaS-vanadium dioxide structure; (d) absorption spectra of the proposed broadband absorber with and without patterned graphene
图 9. 所设计的宽带吸收器在不同极化角下的吸收光谱
Fig. 9. Absorption spectra of the proposed broadband absorber at different polarization angles
图 10. 所设计的宽带吸收器在不同入射角下的吸收光谱。(a) TE极化;(b) TM极化
Fig. 10. Absorption spectra of the proposed broadband absorber at different incident angles. (a) TE polarization; (b) TM polarization
图 11. 不同模式下的斜入射示意图。(a) TE模式;(b) TM模式
Fig. 11. Schematics of oblique incidence in different modes. (a) TE mode; (b) TM mode
李辉, 余江, 陈哲. 基于混合石墨烯-二氧化钒超材料的太赫兹可调宽带吸收器[J]. 中国激光, 2020, 47(9): 0903001. Li Hui, Yu Jiang, Chen Zhe. Broadband Tunable Terahertz Absorber Based on Hybrid Graphene-Vanadium Dioxide Metamaterials[J]. Chinese Journal of Lasers, 2020, 47(9): 0903001.
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