Dynamically Tunable and High-Contrast Graphene-Based Terahertz Electro-Optic Modulator |
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Authors: | Shao-Peng Li Jing Zhou Rui-Ling Yin Qi-Bing Sun |
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Institution: | 1. Department of Physics, Shanxi University of Science & Technology, Xi'an 710021, China;
2. State Key Laboratory of Transient Optics and Photonics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an 710119, China |
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Abstract: | We propose and discuss terahertz(THz) electro-optic modulator induced by periodically patterned graphene microcavity. Due to the joint effect of graphene plasmon resonances and Fabry-Perot(F-P) oscillations, plasmon-induced transparency(PIT) effect is achieved and the operation frequency can be dynamically tuned by graphene Fermi energies and structural parameters. The results reveal that modulation depth(MD) larger than 80% is obtained across a wide frequency range from 4.2 THz to 9.4 THz, and the largest MD and Q factor reaches 95% and 15.8, respectively. In addition, operation frequency range and MD can also be tuned by optimizing the structure parameters. This investigation promises the development of high-performance widely tunable THz modulator in chip integrated photonic circuits. |
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Keywords: | THz modulator graphene |
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