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理论研究了电场驱动的石墨烯系统中等离激元诱导的光电导特性。结果发现德鲁德部分主导光电导的低频区而等离激元诱导产生一个相对较小但是在高频区可以观察到的光电导。德鲁德部分和等离激元诱导部分都位于太赫兹光频谱区。德鲁德部分随着入射光频的增加而单调的减小,而等离激元诱导的部分由于等离激元和光的耦合在大约位于1太赫兹处有一个吸收峰。此外发现等离激元诱导光电导与驱动电场以及由门电压调节的电子浓度有很强的依赖关系。结果显示,石墨烯中的光电导不仅可以通过门电压来调控,而且可以通过驱动电场得到进一步的调节。这些理论结果有助于更深入的理解石墨烯的太赫兹等离激元以及光电子学特性。
The photoconductivity induced by plasmonic in electric field driven graphene system has been theoretically studied. As a result, it was found that the Druode partially dominates the low frequency region of the photoconductor and the plasmon induces a relatively small but photoconductivity that can be observed in the high frequency region. Both the Drude part and the plasmodium-induced part are located in the terahertz spectral region. The Drude part decreases monotonically with increasing incident light frequency, whereas the part induced by plasmon has an absorption peak at approximately 1 THz due to the coupling of plasmonic and light. In addition, it was found that plasmon induced photoconductivity has a strong dependence on the driving electric field and the electron concentration regulated by the gate voltage. The results show that the photoconductivity in graphene can not only be regulated by the gate voltage, but also be further regulated by driving the electric field. These theoretical results help to further understand the terahertz plasmon and the optoelectronic properties of graphene.