The modulation effect of graphene defects on the light absorption properties of photonic crystals
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摘要: 通过构造含石墨烯缺陷光子晶体结构模型(
$ {\rm{ACG}}^{K_1}$ CB)NCGKC(${\rm{BCG}}^{K_2} $ CA)M，利用传输矩阵法理论和计算机模拟仿真的方式，研究了石墨烯缺陷对光子晶体光吸收特性的调制作用。当光子晶体中引入石墨烯缺陷后，光子晶体的光吸收率增强，并出现明显的窄带吸收峰。随着周期数M或K2增大，光子晶体的光吸收率增强，当M=6时吸收率达到96.55%，当K2=4时吸收率达到43.30%，而且吸收峰随M增大向短波方向移动，但随K2增大向长波方向移动。随着周期数K增大，光子晶体的光吸收率先增大到极大值后再减弱，且吸收峰向短波方向移动。随着A介质层（硅单质）厚度dA的增大，光子晶体的光吸收率增强，当dA=178.25 nm时吸收率达到48.54%，且吸收峰向长波方向移动；随着B、C介质层（分别为四氯化碳和砷化镓）厚度dB、dC增大，光子晶体的光吸收率减弱，当dB=178.25 nm时吸收率为33.12%，当dC=155.25 nm时吸收率为25.89%，且吸收峰向长波方向移动。随着光入射角θ增大，光子晶体的光吸收率先增大到极大值后再减弱，且吸收峰向短波方向移动。研究结果表明石墨烯缺陷对光子晶体光吸收特性具有很好的调制作用，为新型光学吸收器、滤波器和全反射器等材料研究和选择提供理论参考。Abstract: The structure model (${\rm{ACG}}^{K_1}$ CB)NCGKC(${\rm{BCG}}^{K_2}$ CA)M of photonic crystal with graphene defect is constructed and the modulation effect of graphene defects on the light absorption characteristics of photonic crystals is studied by transfer matrix method and computer simulation. When graphene defect are introduced into the photonic crystal, the optical absorptivity of the photonic crystal are enhanced and an obvious narrow-band absorption peak appears. With the increase of period number M or K2, the optical absorptivity increases. When M=6, the absorptivity is 96.55%, when K2=4, the absorptivity is 43.30%. The absorption peak moves towards the short wave with the increase of M while towards the long wave with the increase of K2. With the increase of the period number K, the light absorption of photonic crystal increases to the maximum value first and then decreases, and the absorption peak moves towards the short wave. As dA, the thickness of A medium layer (monatomic silicon) increases, the optical absorptivity of photonic crystal is enhanced. When dA=178.25 nm, the absorptivity is 48.54%, and the absorption peak moves to the long wave direction; With the increase of the thickness dB of B (carbon tetrachloride) and dC of C (gallium arsenide) dielectric layer, the optical absorptivity of photonic crystals decreases. When dB=178.25 nm, the absorptivity is 33.12%, when dC=155.25 nm, the absorptivity is 25.89%, and the absorption peak moves to long wave direction. With the increase of incident angle θ, the optical absorptivity of photonic crystal first increases to the maximum and then decreases, and the absorption peak moves in the short wave direction. The result shows that graphene defects have a good modulation effect on the light absorption characteristics of photonic crystals, which provides a theoretical reference for the research and selection of novel optical absorbers, filters and total reflectors.-
Key words:
- graphene /
- photonic crystal /
- defect /
- optical absorption /
- modulation
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图 3 M、K2、K对吸收特性的影响
Figure 3. Absorption characteristics varying with different M，K2 and K
图 4 dA、dB、dC对吸收特性的影响
Figure 4. Absorption characteristics varying with different dA，dB and dC
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