# Analysis of terahertz wave nonlinear reflection by an array of double silicon elements placed on a metal substrate

## TL;DR

This paper presents a simulation study of nonlinear terahertz wave reflection from a silicon-on-metal metasurface, highlighting conditions for bistability and hysteresis effects related to high-Q trapped mode resonance.

## Contribution

It introduces a novel simulation approach to analyze nonlinear reflection phenomena in silicon-on-metal metasurfaces with high-Q resonances.

## Key findings

- Identification of conditions for bistability in nonlinear reflection
- Observation of hysteresis effects in terahertz reflection
- Analysis of high-Q trapped mode resonance impact

## Abstract

We demonstrate results of a simulation of nonlinear reflection of intensive terahertz radiation from a silicon-on-metal metasurface involving an excitation of a high-Q trapped mode resonance. Conditions are presented to observe effects of bistability and hysteresis of nonlinear reflection.