Cen Chunlian, Chen Zeqiang, Xu Danyang, Jiang Liying, Chen Xifang, Yi Zao, Wu Pinghui, Li Gongfa, Yi Yougen
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China.
Research Center for Photonic Technology, Fujian Key Laboratory for Advanced Micro-nano Photonics Technology and Devices & Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China.
Nanomaterials (Basel). 2020 Jan 2;10(1):95. doi: 10.3390/nano10010095.
By means of critical coupling and impedance matching theory, we have numerically simulated the perfect absorption of monolayer graphene. Through the critical coupling effect and impedance matching, we studied a perfect single-band absorption of the monolayer graphene and obtained high quality factor (Q-factor = 664.2) absorption spectrum which has an absorbance close to 100% in the near infrared region. The position of the absorption spectrum can be adjusted by changing the ratio between the radii of the elliptic cylinder air hole and the structural period. The sensitivity of the absorber can be achieved S = 342.7 nm/RIU (RIU is the per refractive index unit) and FOM = 199.2 (FOM is the figure of merit), which has great potential for development on biosensors. We believe that our research will have good application prospects in graphene photonic devices and optoelectronic devices.
通过临界耦合和阻抗匹配理论，我们对单层石墨烯的完美吸收进行了数值模拟。通过临界耦合效应和阻抗匹配，我们研究了单层石墨烯的完美单波段吸收，并获得了高品质因数（Q因数 = 664.2）的吸收光谱，该光谱在近红外区域的吸光度接近100%。吸收光谱的位置可以通过改变椭圆圆柱空气孔半径与结构周期之间的比例来调整。该吸收器的灵敏度可达S = 342.7 nm/RIU（RIU是每折射率单位），优值FOM = 199.2，在生物传感器方面具有很大的发展潜力。我们相信我们的研究在石墨烯光子器件和光电器件方面将有良好的应用前景。
