Lignin-Derived Lightweight Carbon Aerogels for Tunable Epsilon-Negative Response.

The frequency dispersion of the epsilon‐negative response becomes more pronounced at higher CA densities due to an increasing trend of negative permittivity with frequency until reaching the so‐called cutoff frequency ( ω p ).

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This behavior is characterized by a decreasing trend in alternating current (AC) conductivity ( σ ac ) with frequency, akin to the skin effect observed in metallic conductors.

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