Researchers invent broad-band tunable terahertz absorber

Phys.org  November 24, 2020
THz absorbers with strong absorption, broad-band absorption bandwidth and tunable characteristics have attracted the attention of many researchers with extensive application prospects in THz wave shielding, THz imaging, and THz sensitive thermal detecting. Researchers in China introduced strongly correlated electron material VO2 as a functional layer and realized the broad-band tunable THz spectrum properties in the device. The conductivity, dielectric constant, as well as optical properties got a dramatic switching during the insulator-metal transition at TC = 340 K, and the transition could be tuned by temperature, electric field, and light. The device had a 74% absorption modulation depth, antireflection (the reflection is near zero) and broad-band Ï€-phase shift of reflection THz waves were realized at a certain pump fluence. The research clarified the physical origin of these active THz multifunctional modulations…read more. TECHNICAL ARTICLE

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