This method demonstrates anomalous terahertz transmittance in Huygens’ metasurfaces, suggesting new amplification approaches.
We demonstrate a novel method for achieving tunable terahertz wave amplification using a time-variant Huygens’ metasurface. By imposing a time boundary through ultrafast carrier injection, we observed an anomalous THz transmittance exceeding unity at frequencies determined by the relative delay between the time boundary and the seed terahertz pulse.
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Zhou et al. (2025) studied this question.
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