In this Letter, we have shown that a giant Goos-Hanchen shift of a light beam reflected at terahertz frequencies can be achieved by using a composite structure, where monolayer graphene is coated on one-dimensional photonic crystals separated by a dielectric slab. This giant Goos-Hanchen shift originates from the enhancement of the electrical field, owing to the excitation of optical Tamm states at the interface between the graphene and one-dimensional photonic crystal. It is shown that the Goos-Hanchen shift in this structure can be significantly enlarged negatively and can be switched from negative to positive due to the tunability of graphene's conductivity. Moreover, the Goos-Hanchen shift of the proposed structure is sensitive to the relaxation time of graphene and the thickness of the top layer, making this structure a good candidate for a dynamic tunable optical shift device in the terahertz regime.
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School of Physics and Electronics, Hunan Normal UniversitySchool of Physics and Electronics, Hunan Normal University
董胡
董俊
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School of Physics and Electronics, Hunan Normal UniversitySchool of Physics and Electronics, Hunan Normal University
董俊
钱盛友
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School of Physics and Electronics, Hunan Normal UniversitySchool of Physics and Electronics, Hunan Normal University
钱盛友
郭珺
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Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering,Jiangsu Normal UniversitySchool of Physics and Electronics, Hunan Normal University
郭珺
蒋乐勇
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School of Physics and Electronics, Hunan Normal UniversitySchool of Physics and Electronics, Hunan Normal University
蒋乐勇
项元江
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International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, College of Optoelectronic Engineering, Shenzhen UniversitySchool of Physics and Electronics, Hunan Normal University
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Shizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, JapanShizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, Japan
Hirai, Yusuke
Matsunaga, Kouki
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Shizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, JapanShizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, Japan
Matsunaga, Kouki
Neo, Yoichiro
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Shizuoka Univ, Res Inst Elect, 3-5-1 Johoku Naka, Hamamatsu, Shizuoka 4328011, JapanShizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, Japan
Neo, Yoichiro
Matsumoto, Takahiro
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Nagoya City Univ, Grad Sch Design & Architecture, Chikusa Ku, 2-1-10 Kita Chikusa, Nagoya, Aichi 4640083, JapanShizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, Japan
Matsumoto, Takahiro
Tomita, Makoto
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Shizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, JapanShizuoka Univ, Dept Phys, Fac Sci, 836 Ohya, Suruga, Shizuoka 4228529, Japan