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Updated: Apr 2, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Ultrafast topological transitions driven by permittivity modulation in non-Hermitian multilayers
Abstract:
Ultrafast modulation of epsilon-near-zero (ENZ) media enables dynamic control of non-Hermitian photonic systems. We demonstrate that an ITO/SiO2/Ag multilayer supporting hybrid ENZ-plasmon modes undergoes pronounced temporal reshaping when described by a time-dependent Drude-Lorentz permittivity and analyzed using rigorous coupled-wave analysis. Picosecond carrier relaxation induces avoided crossings, transient spectral gaps, and mode hybridization, while reflection-phase singularities traverse the angle-wavelength plane and produce discrete changes in the winding number. The results establish ENZ-assisted temporal modulation as a compact platform for reconfigurable non-Hermitian photonics.
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