On the Nature of the Fundamental Plasma Excitation in a Plasmonic Crystal

TL;DR

This paper experimentally investigates plasma excitations in a plasmonic crystal, revealing how mode frequency and relaxation depend on structural parameters, and introduces an analytical model for these phenomena.

Contribution

The study provides the first comprehensive experimental analysis combined with an analytical approach to understand plasma excitations in plasmonic crystals.

Findings

Mode frequency varies with gate width and crystal period.

Relaxation properties depend on structural parameters.

Analytical model accurately describes plasma excitation behavior.

Abstract

We report on the experimental study of the spectrum of plasma excitations in a plasmonic crystal fabricated from the two-dimensional electron system in an AlGaAs/GaAs semiconductor heterostructure. We perform a comprehensive research on the mode frequency and relaxation as a function of the gate width across different plasmonic crystal periods. Importantly, we develop an analytical approach that accurately describes the behavior of plasma excitations in plasmonic crystals, providing new insights into the fundamental physics of plasmonic systems.