Giant terahertz near-field enhancement by two-dimensional plasmons

TL;DR

This paper demonstrates that a periodically gated 2D electron system can resonantly enhance terahertz energy concentration through plasmonic cavity modes, achieving electric field enhancements up to 10,000 times.

Contribution

It introduces a novel tunable plasmonic cavity in a 2D electron system that significantly amplifies terahertz near-field energy using resonant plasmon excitation.

Findings

Giant electric field enhancement factor up to 10,000.

Resonant excitation of plasmons in a periodic lattice.

Deep sub-wavelength concentration of terahertz energy.

Abstract

We consider a periodically gated two-dimensional electron system, with a central gate finger biased independently creating a tunable plasmonic cavity in a planar plasmonic crystal. We demonstrate that the plasmons resonantly excited in the periodic plasmonic lattice by incident terahertz radiation can strongly pump the cavity plasmon modes leading to a deep sub-wavelength concentration of terahertz energy with giant electric field enhancement factor up to 10000.