A simulation work on thermally tunable and highly sensitive terahertz smart window device with dual-band absorption and wide-ranging transmission based on VO2 phase-change material

Abstract

This study introduces a sophisticated terahertz smart window crafted from VO2 phase-change material. When the temperature rises to 345 K, this device displays impressive absorption capabilities, absorbing over 90 % of terahertz waves within the frequency bands of 1.888–5.552 THz (3.664 THz) and 11.088–12.896 THz (1.808 THz). Conversely, at lower temperatures (318 K), it showcases exceptional transparency, transmitting more than 80 % of terahertz waves in the 0–8.005 THz range. Notably, it achieves a peak absorption rate of 99.9 % at 12.112 THz. The device allows precise adjustment of absorption levels from 0 % to 99.9 %. We delve into the internal factors influencing the device’s performance variability. Subsequently, we investigate the distribution of surface electric fields. The LSPR principle is used to reveal the underlying mechanisms driving dual-band absorption and extensive transmission. Additionally, we offer insights into altering the physical parameters of the smart window. The inherent structural coordination and manufacturing adaptability were revealed. Lastly, we explore how different incident angles impact the device’s performance, noting its consistent excellence across a wide range of angles. This finding holds significant implications for the practical utility of the device. In summary, the proposed terahertz smart device has great application potential in communication, detection, detection and other fields, and can help realize extremely fast wireless data transmission (over 10Gbit/s). And the use of drug microstructure is the characteristics of macromolecules, absorption of its spectrum to judge what kind of drug. Applied to the surface of the drone can help stealth. The future development of terahertz devices is proposed.