Parametric metasurfaces for electromagnetic wave amplification

Abstract

We study parametric amplification of electromagnetic waves by metasurfaces. We design a variable capacitor-loaded metasurface that is able to amplify incident electromagnetic waves. We analyze various regimes of operation of the system and find that we can achieve a significant gain (over 10 dB) in just one layer of such structure, and this gain can be controlled by the parametric modulation. We study the instability threshold for this system and show that a simple theoretical model agrees well with the results of full numerical simulations.Comment: The following article has been submitted to Applied Physics Letters. After it is published, it will be found at https://pubs.aip.org/aip/ap