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.

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.