Laser & Optoelectronics Progress, Volume. 56, Issue 5, 052601(2019)

Dependence of Optical Absorption Characterization of Graphene on Its Complex Optical Conductivity in Terahertz Regime

Cuihong Yang1,2、*, Zhen Liu1,2, Jingyun Zhang1,2, and Xiaofei Ma1,2
Author Affiliations
  • 1 Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China;
  • 2 School of Physics & Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China;
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    The transfer matrix method is used to study the optical transport process in a terahertz frequency region in grapheme-containing multilayer dielectric structures. In the multilayer structures, the optical absorption exhibits as multiple absorption peaks, and the position of these peaks depends on the incident frequency, incident angle and graphene chemical potential. With the increase of the graphene chemical potential and the layer number of the graphene, the absorptivity increases and the imaginary part of the graphene conductivity increases, and the position of the absorption peak shifts blue. The periodic absorption peak occurs under the condition that the reflected light interference is cancelled, and can be understood by the phase difference between the two main reflected lights. Therefore, the chemical potential and energy level broadening factor parameters of the graphene can be given based on the position and intensity of the graphene absorption peak in the light transmission. The parameter conditions related to the graphene materials which can improve the absorptivity of graphene and reduce the transmittance are given.

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    Cuihong Yang, Zhen Liu, Jingyun Zhang, Xiaofei Ma. Dependence of Optical Absorption Characterization of Graphene on Its Complex Optical Conductivity in Terahertz Regime[J]. Laser & Optoelectronics Progress, 2019, 56(5): 052601

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    Paper Information

    Category: Physical Optics

    Received: Jul. 30, 2018

    Accepted: Sep. 12, 2018

    Published Online: Jul. 31, 2019

    The Author Email: Yang Cuihong (chyang@nuist.edu.cn)

    DOI:10.3788/LOP56.052601

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