# Transformation optics based on metasurfaces

## TL;DR

This paper discusses the development and advantages of metasurfaces, a two-dimensional metamaterial that efficiently manipulates electromagnetic waves with reduced fabrication complexity and propagation loss, enabling novel applications like gravity analogies.

## Contribution

The paper introduces the concept of metasurfaces for electromagnetic wave control and demonstrates their potential for efficient wavefront manipulation with simplified fabrication.

## Key findings

- Metasurfaces can control wavefronts with subwavelength thickness.
- They reduce fabrication complexity compared to 3D metamaterials.
- Experimental work shows applications in gravity analogies.

## Abstract

Recently, new artificial material has been proposed to control an electromagnetic wave-metasurface, a two-dimensional metamaterial. Compared with a three-dimensional bulky metamaterial, this artificial plane material with sub-wavelength thickness greatly reduces fabrication time and mitigates fabrication complexity. Additionally, traditional metamaterials usually control the wavefront of an electromagnetic wave by accumulating the phase through propagating at a distance far larger than the wavelength. However, a metasurface can efficiently manipulate the wavefront of an incident electromagnetic wave through just the subwavelength propagation distance. Therefore, this can largely alleviate the propagation loss. Given the fact that a metasurface has high manipulation efficiency for an electromagnetic wave in the near filed regime, our group investigated experimental work on the analogy of gravity using a metasurface.

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Source: https://tomesphere.com/paper/1907.05001