Investigation of broadband terahertz generation from metasurface

TL;DR

This paper explores broadband terahertz generation using nonlinear metasurfaces composed of nanoscale split-ring resonators, demonstrating a new approach that bypasses quasi-phase-matching constraints.

Contribution

It introduces a novel scheme for broadband THz source creation using nonlinear plasmonic metamaterials with split-ring resonators, analyzed via a hydrodynamic model.

Findings

Enables broadband terahertz radiation generation.

Operates without quasi-phase-matching conditions.

Provides a new concept for designing nonlinear plasmonic metamaterials.

Abstract

The nonlinear metamaterials have been shown to provide nonlinear properties with high nonlinear conversion efficiency and in a myriad of light manipulation. Here we study terahertz generation from nonlinear metasurface consisting of single layer nanoscale split-ring resonator array. The terahertz generation due to optical rectification by the second-order nonlinearity of the split-ring resonator is investigated by a time-domain implementation of the hydrodynamic model for electron dynamics in metal. The results show that the nonlinear metasurface enables us to generate broadband terahertz radiation and free from quasi-phase-matching conditions. The proposed scheme provides a new concept of broadband THz source and designing nonlinear plasmonic metamaterials.