Phys.org July 17, 2023 Materials scientists are actively hunting for metamaterials that are “perfect absorbers” of electromagnetic radiation with controllable resonance characteristics that lead to their wide usage in applications as varied as solar cells, thermal radiation imaging, sensing technology, and even stealth technology. An international team of researchers (Pakistan, USA – University of Alabama) has developed a triple-band perfect metamaterial absorber in terahertz regime that is made of asymmetric metallic I-shaped resonator and metallic ground layer with dielectric spacer in the middle. The simulated results showed that the absorption device had three resonance modes with corresponding absorption rate close […]
Tag Archives: Metamaterial
Ultrafast and tunable: Graphene-based terahertz-to-visible light conversion
Nanowerk, June 15, 2023 Several technologies could benefit from the availability of fast and controllable conversion of terahertz light to visible light. An international team of researchers (Germany, Spain, UK) demonstrated that the exceptional properties and dynamics of electronic heat in graphene allow for a THz-to-visible conversion, which is switchable at a sub-nanosecond time scale. They showed a tunable on/off ratio of more than 30 for the emitted visible light, achieved through electrical gating using a gate voltage on the order of 1 V and that a grating-graphene metamaterial leads to an increase in THz-induced emitted power in the visible […]