Dynamic coherent perfect absorption in nonlinear metasurfaces

TL;DR

This paper introduces a tunable nonlinear metasurface capable of achieving coherent perfect absorption by adjusting input beam phases and intensities, enabling applications in thermal emitters, modulators, and sensors.

Contribution

It presents a novel ultrathin nonlinear metasurface design that allows dynamic control of absorption properties through optical nonlinearity and phase manipulation.

Findings

Achieves tunable absorption from complete to partial

Demonstrates control via input beam phase and intensity

Potential applications in tunable thermal emitters and sensors

Abstract

We propose a tunable coherent perfect absorber based on ultrathin nonlinear metasurfaces. The nonlinear metasurface is made of plasmonic nanoantennas coupled to an epsilon-near-zero material with a large optical nonlinearity. The coherent perfect absorption is achieved by controlling the relative phases of the input beams. We show that the optical response of the nonlinear metasurface can be tuned from a complete to a partial absorption by changing the intensity of the pump beam. The proposed nonlinear metasurface can be used to design optically tunable thermal emitters, modulators, and sensors.