Abstract-Broadband Adjustable Terahertz Absorption in Series Asymmetric Oval-Shaped Graphene Pattern

Jian-Zhong Sun, Jiu-Sheng Li

https://www.frontiersin.org/articles/10.3389/fphy.2020.00245/full


We propose a broadband adjustable graphene absorber in terahertz regime. A prototype is designed to verify the terahertz absorption characteristics by a periodic array layer of series asymmetric oval-shaped graphene patterns on polyimide and bottom layer of metal plate. The absorber with 92% absorption and the bandwidth ranging from 3.39 to 5.96 THz is achieved. By changing the Fermi level of graphene, the bandwidth and absorption can be flexibly adjusted. The absorption is more than 92% in the range of 0~40° incident angle. Using these characteristics, the simple absorber has broad application prospects in the fields of filter and switch in terahertz region.

Abstract-Photonic crystal-based waveguide terahertz wave Set-Reset latch

• Jian-Zhong Sun, 
• Jiu-Sheng Li

• ^, 

• Centre for THz Research, China Jiliang University, Hangzhou, 310018, Chin
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• http://www.sciencedirect.com/science/article/pii/S0030402617308495
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In terahertz system, controlling terahertz wave propagation is a very important issue. In this letter, we have proposed and demonstrated a terahertz wave Set-Reset latch based on two-dimensional photonic crystal. The present device consists of two photonic crystal NOR gates and two photonic crystal multimode-interfere structures. Finite-difference time-domain method is used to analyze and confirm the propagation properties of the device. The total size of our proposed Set-Reset latch is equal to 85a × 40a. The response time of the Set-Reset latch is 3.25 ps. Our study suggests that the Set-Reset latch has great potential in future terahertz wave information processing integrated circuit.