# Metasurfaces with Interleaved Electric and Magnetic Resonances for Broadband Arbitrary Group Delay in Reflection

## TL;DR

This paper introduces metasurfaces capable of providing arbitrary, broadband group delay in reflection by leveraging interleaved electric and magnetic resonances, enabling advanced temporal control of electromagnetic waves.

## Contribution

It demonstrates a novel metasurface design that achieves ultra-wide bandwidth phase modulation and precise group delay control through combined electric and magnetic resonances.

## Key findings

- Achieves arbitrary large phase modulation over ultra-wide bandwidths.
- Enables perfect broadband pulse reflection with prescribed group delay.
- Opens new avenues for temporal control and dispersion engineering.

## Abstract

Metasurfaces impart phase discontinuities on impinging electromagnetic waves that are typically limited to 0-2$\pi$. Here, we show that they can break free from this limitation and supply arbitrarily-large phase modulation over ultra-wide bandwidths. This is achieved by implementing multiple, properly-arranged resonances in the electric and magnetic sheet admittivities. We demonstrate metasurfaces that can perfectly reflect a broadband pulse imparting a prescribed group delay without distorting the pulse shape, opening new possibilities for temporal control and dispersion engineering across deeply subwavelength physical scales.

---
Source: https://tomesphere.com/paper/1902.01121