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Related Experiment Video

Updated: Nov 28, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Dynamic coherent perfect absorption in nonlinear metasurfaces.

Rasoul Alaee, Yaswant Vaddi, Robert W Boyd

|December 1, 2020

Summary

We developed a tunable coherent perfect absorber using nonlinear metasurfaces. This device allows for precise control over light absorption by adjusting pump beam intensity, enabling novel optical applications.

Area of Science:

* Photonics and Metamaterials
* Nonlinear Optics
* Plasmonics

Background:

* Coherent perfect absorbers (CPAs) enable complete light absorption.
* Nonlinear optical materials offer dynamic control over light-matter interactions.
* Metasurfaces provide a platform for miniaturized optical devices.

Purpose of the Study:

* To propose and demonstrate a tunable CPA based on ultrathin nonlinear metasurfaces.
* To investigate the dynamic tuning of absorption by varying pump beam intensity.
* To explore potential applications in optical devices.

Main Methods:

* Fabrication of nonlinear metasurfaces comprising plasmonic nanoantennas coupled to an epsilon-near-zero (ENZ) material with high optical nonlinearity.

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Last Updated: Nov 28, 2025

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* Utilizing controlled phase relationships of input beams for coherent perfect absorption.

* Modulating the pump beam intensity to tune the metasurface's optical response.

Main Results:

* Demonstrated coherent perfect absorption in an ultrathin nonlinear metasurface.
* Showcased dynamic tunability of absorption from complete to partial by altering pump beam intensity.
* Confirmed the influence of nonlinear optical properties on absorption characteristics.

Conclusions:

* The proposed nonlinear metasurface offers a novel approach to tunable coherent perfect absorption.
* The device's optical response can be dynamically controlled via pump beam intensity.
* Potential applications include optically tunable thermal emitters, modulators, and sensors.