Laser & Optoelectronics Progress, Volume. 58, Issue 13, 1316001(2021)
Switchable Broadband Terahertz Absorber Based on Temperature Control
To realize the dynamic adjustable function of the broadband absorber, this paper proposes and designs a symmetrical absorber structure composed of a square top layer with embedded cross, a SiO2 dielectric layer, and a VO2 bottom layer. In the range from 2 THz to 4 THz, the absorption efficiency of the device can be adjusted from less than 10% to more than 90% by adjusting the conductivity of the bottom layer of VO2, and its switching modulation depth is greater than 65%. In a wide frequency range, the device can be dynamically switched between the reflector and perfect absorber modes. The simulation results show that the absorber has wide-angle and polarization-insensitive characteristics, and the incident angle range of electromagnetic waves to the absorber can reach 75°. Based on the above advantages, the absorber has great potential in terahertz device applications such as smart attenuators, reflectors, and spatial modulators.
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Guang Zhu, Yuehua Huo, Yanqiong Shi. Switchable Broadband Terahertz Absorber Based on Temperature Control[J]. Laser & Optoelectronics Progress, 2021, 58(13): 1316001
Category: Materials
Received: Jan. 8, 2021
Accepted: Apr. 7, 2021
Published Online: Jul. 14, 2021
The Author Email: Zhu Guang (guangzhu@ahjzu.edu.cn)