SnSe₂-functionalized ultrafast terahertz switch with ultralow pump threshold

Abstract

Integrating metasurface with photoactive materials provides a unique and promising method to achieve the ultrafast modulation of terahertz (THz) waves. However, less attention has been paid to the practical issues...

Quantized energy harvesting in vibrating maglev graphite driven by terahertz waves

“…Since the wavelength of visible light is much smaller than that of THz waves, the graphite motion curve can be accurately obtained by detecting the change in the reflection of visible light during the movement of graphite. 35 So experiments are completely feasible.…”

“…[31][32][33][34] THz waves are electromagnetic waves with a frequency range from 0.1 THz to 10 THz. THz waves have broad application prospects in the fields of switchable sensing, 35,36 wireless communication, 35,37,38 medical diagnosis, 39 astronomy, 40 topological excitonic insulators, [41][42][43] and food safety. 44 Using THz waves to drive micro-nano motors has more potential advantages than using other wave bands.…”

Terahertz Metasurface Modulators Based on Photosensitive Silicon

“…From the above analysis, it can be seen that due to the ultrashort relaxation time of photo‐generated carriers, the frequency switchable device can theoretically achieve ultrafast switching at sub‐picosecond level by the optical pump, which has great advantages in terms of modulation rate and has great prospects for future applications in THz modulators, THz high‐speed communication technology, and THz silicon‐based photonics devices. [ 31,90 ]…”

Design of an ultra-broadband terahertz absorber based on a patterned graphene metasurface with machine learning

“…In the past few decades, metasurfaces, as the two-dimensional equivalence of metamaterials, can freely manipulate the frequency, 1,2 phase, 3,4 amplitude, 5 and polarization 6 of electromagnetic (EM) waves in a compact plane compared with traditional bulk materials. It provides an unprecedented control dimension for the light–matter interaction, so it has experienced rapid and violent development in EM absorbers, 7 microlenses, 8 and holographic technology, 9 to complex systems of signal processing, 10 information encryption, 11 and other applications. 12,13 Metasurface absorbers have potential important application prospects in wireless applications, especially in the terahertz (THz) band, such as radar and target recognition, 14 broadband communication, 15 and dangerous object detection.…”