Acta Optica Sinica, Volume. 42, Issue 19, 1916001(2022)
Narrow/Broad Band Switchable Terahertz Absorber Based on Graphene and Vanadium Dioxide Composite Structure
This paper presents a dynamically tunable narrow/broad band switchable THz absorber. The absorber is composed of tunable materials, i.e., graphene and VO2, and gold and cycloolefin copolymers. When VO2 is thermally induced to achieve insulator-to-metal transition, the absorber switches between broad bands and narrow bands. Its switching amplitude can reach 98.9%. When VO2 is in metallic phase, the absorber has a wide absorption bandwidth. At that time, the bandwidth of the absorber can be adjusted by changing the Fermi level of graphene. The absorber also has characteristic of wide-angle absorption for transverse electric (TE) and transverse magnetic (TM) waves. When VO2 is in insulating state, the device switches to a narrowband absorber with a sensitivity of 439 GHz/RIU, which can be used in sensor. The THz absorber has many potential applications in multi-functional devices such as modulation, sensing, and electromagnetic cloaking.
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Chengcheng Huang, Yonggang Zhang, Lanju Liang, Haiyun Yao, Wenjia Liu, Fu Qiu. Narrow/Broad Band Switchable Terahertz Absorber Based on Graphene and Vanadium Dioxide Composite Structure[J]. Acta Optica Sinica, 2022, 42(19): 1916001
Category: Materials
Received: Feb. 14, 2022
Accepted: Mar. 30, 2022
Published Online: Oct. 18, 2022
The Author Email: Zhang Yonggang (ygzhang2000@163.com), Liang Lanju (lianglanju123@163.com)