Voltage-controlled enhancement of optical absorption in a graphene monolayer with a one-dimensional photonic crystal

作者：Rao, Wei-Feng^*; Zhang, Mao-Ting; Zheng, Gai-Ge

来源：Applied Physics B: Lasers and Optics , 2017, 123(9): 232.

DOI：10.1007/s00340-017-6810-z

• COHERENT PERFECT ABSORPTION
• TERAHERTZ
• SURFACE

The structure of a one-dimensional photonic crystal (1D-PhC) with a graphene-based defect is proposed and investigated to enhance the optical response of graphene in the visible to near-infrared (NIR) wavelength region. An electro-optical (EO) tuning material lithium niobate-(LiNbO3, LN) is selected as the spacer layer with an external voltage applied on it. By means of the transfer-matrix method (TMM), the dependence of the absorption characteristics on the incident angle and period numbers is analyzed. The possibility of the resonant wavelength being tunable via the external voltage and thickness of the LN layer is also discussed. It is shown that nearly perfect absorption can be achieved by a certain choice of the period numbers of the 1D-PhC surrounding the defect layer at a specific incidence. The linear relation between the peak wavelength and the applied external voltage is also demonstrated, and it is possible to control the position and number of the resonant wavelengths by varying the voltage and thickness of the LN defect layer.

• 出版日期2017-9
• 单位南京信息工程大学