不同光功率激励下石墨烯的太赫兹波吸收特性

基于太赫兹时域光谱系统和德鲁德模型, 测量并分析了少层石墨烯在600 nm CW红光和两种衬底下的透过率及电导率.结果发现, 高阻硅衬底的石墨烯样品在光场激励下对太赫兹信号的吸收显著增强, 而PET(Polyethylene terephthalate)衬底的石墨烯样品在光场激励下对太赫兹信号的吸收则有微弱减少.相较于无激励光场条件, 在0.5 THz处, 高阻硅衬底石墨烯的电导率提升了7倍, PET衬底石墨烯的电导率下降了23%.同时实验也验证了在太赫兹波段少层石墨烯的电导为各层石墨烯电导的线性叠加.

Abstract

The transmissivity and conductivity of the few-layer graphene with 600 nm CW laser and two substrates are measured and analyzed, based on terahertz time-domain spectroscopy and the Drude model. In this study, the absorption of terahertz signal is obviously enhanced through the graphene on high-resistivity silicon or the absorption of terahertz signal is slightly decreased through the graphene on PET (Polyethylene terephthalate) with the excitation of external laser. At 0.5 THz, the conductivity of the graphene on high-resistivity silicon is increased by 7 times or the conductivity of the graphene on PET is felled to 77%, compared to that without external laser. Meanwhile the experiments verify that the conductance in the few-layer graphene appears as the linear superposition of per layer among the THz waveband.

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张文涛, 李赣, 占平平, 李跃文, 张玉婷. 不同光功率激励下石墨烯的太赫兹波吸收特性[J]. 光子学报, 2018, 47(5): 0516005. ZHANG Wen-tao, LI Gan, ZHAN Ping-ping, LI Yue-wen, ZHANG Yu-ting. Characterizing the Absorption of Terahertz Wave by Graphene under the Excitation of Different Luminous Power[J]. ACTA PHOTONICA SINICA, 2018, 47(5): 0516005.

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