Chunlian Cen, Lin Liu, Yubin Zhang, Xifang Chen, Zigang Zhou, Zao Yi, Xin Ye, Yongjian Tang, Yougen Yi, and Shuyuan Xiao
https://www.osapublishing.org/ome/abstract.cfm?uri=ome-9-2-706&origin=search |
| Fig. 1 The structural representation and geometric parameters of periodic elliptical hollow graphene arrays deposited on SiO2, and the geometric parameters are marked as shown in the figure. The electric field direction is parallel to |
In this contribution, a tunable plasmonic absorber consisting of periodical elliptical hollow graphene arrays deposited on SiO2 substrate is proposed in the far infrared and terahertz (THz). The simulation calculation results show that the structure supports a variety of effective tuning methods, such as changing the period, geometry parameters, Fermi level, relaxation time, incident angle, to achieve active and passive tuning. When the incident angle is set to 60°, the maximum absorption value (0.31) in our work can be achieved. Meanwhile, the red shift caused by period variations and blue shift phenomenon made of geometry parameters provides an exercisable way to select the resonance range. Therefore, these outcomes undoubtedly offer a unique source of inspiration for the diversity of graphene array shapes and the design and fabrication of absorption-related devices, such as filters, spatial light modulators, and sensors.
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
No comments:
Post a Comment