Solvated electrons in polar liquids as epsilon-near-zero materials tunable in the terahertz frequency range

2025/05/28 by Runge, Matthias, Woerner, Michael, Bondar, Denys I. +1 · 2 citations
#Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2505.22198

Abstract

Electrons in polar liquids give rise to a polaron resonance at a terahertz (THz) frequency ν₀ depending on electron concentration. The impact of this resonance on light propagation is studied in experiments, where a femtosecond pump pulse generates electrons via multiphoton ionization and a THz probe pulse propagated through the excited sample is detected in a phase-resolved way. We observe a behavior characteristic for epsilon-near-zero (ENZ) materials with strongly modified phase and group velocities around ν₀, and a broadening of the THz pulse envelope below ν₀. Calculations based on a local-field approach reproduce the ENZ behavior.

Citations

• Nonlinear terahertz polarizability of electrons solvated in a polar liquid

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• The Mass and Velocity of Light from Energy and Momentum Conservation

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