Chen Jiajia, Zeng Yu, Xu Xibin, Chen Xifang, Zhou Zigang, Shi Pengcheng, Yi Zao, Ye Xin, Xiao Shuyuan, Yi Yougen
School of Science, Southwest University of Science and Technology, Mianyang 621010, China.
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China.
Nanomaterials (Basel). 2018 Mar 19;8(3):175. doi: 10.3390/nano8030175.
In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the direction of the x and the y axis, respectively.) within certain limits, and increase the chemical potential of graphene, so as to enhance the absorption of light in the elliptical graphene arrays. We also compare the absorption spectra of the original structure and the complementary structure, and find that the absorption of the original structure is higher than that of the complementary structure. In the end, we study the changes in the absorption rate of the double layer structure of the elliptical array with the increase in the thickness of SiO₂. The elliptical array structure can be applied to tunable spectral detectors, filters and sensors at far-infrared and terahertz wavelengths.
在本文中，我们提出了一种波长可调谐吸收器，它由远红外和太赫兹区域的周期性椭圆石墨烯阵列组成。通过模拟，我们发现可以增加椭圆长轴的长度，在一定范围内提高TM偏振和TE偏振（TM偏振和TE偏振分别表示入射电场沿x轴和y轴方向的方向）的入射角，并增加石墨烯的化学势，从而增强椭圆石墨烯阵列中的光吸收。我们还比较了原始结构和互补结构的吸收光谱，发现原始结构的吸收高于互补结构。最后，我们研究了椭圆阵列双层结构的吸收率随SiO₂厚度增加的变化。椭圆阵列结构可应用于远红外和太赫兹波长的可调谐光谱探测器、滤波器和传感器。
