journal article·2021-07-27

Fully Optically Tunable and Flexible Composite Films for Enhanced Terahertz Control and Multifunctional Terahertz Devices

Weien Lai, Run Shi, Hao Yuan, Gen Liu, Abbas Amini, Chun Cheng

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Abstract

Flexible terahertz (THz) devices that incorporate with active media can effectively manipulate THz waves and thus hold a high position for the next generation of THz devices. Here, we propose a fully optically tunable and soft composite film based on vanadium dioxide nanowires/poly(vinylpyrrolidone) (VO2/PVP), which presents a NIR light-driven THz modulation. The modulation mechanism and multifunctional properties of the VO2/PVP composite film are investigated; it exhibits a large modulation depth of ∼65%, a very low-power NIR light-driven THz modulation, and excellent mechanical flexibility. The experimental results are shown to be in good agreement with numerical simulations. Further, the VO2/PVP composite film is utilized as an optically active medium to implement an optically tunable and highly flexible THz polarizer; the device possesses multifunctional capabilities for manipulating THz wave polarization and modulating THz wave amplitude. Considering the simple preparation process of the proposed composite film by the spin-coating method and its convenient implementation in THz systems, this work provides an alternative strategy to develop actively tunable and flexible THz compact devices.
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Research context

OpenAlex topics: Terahertz technology and applications · Metamaterials and Metasurfaces Applications · Plasmonic and Surface Plasmon Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Engineering Laboratory of Special Display Technology, National Key Laboratory of Advanced Display Technology, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Academy of Opto-Electronic Technology, HeFei University of Technology, Hefei 230009, People’s Republic of China

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China

Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China

Center for Infrastructure Engineering, Western Sydney University, Kingswood, New South Wales 2751, Australia

Funding

Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Anhui Province · Basic Research Projects of Science and Technology Plan of Shenzhen

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