# Wavefront manipulation based of the excitation of bound states in dielectric photonic crystals and bilayer metasurfaces

## TL;DR

This paper explores how bound surface modes in dielectric photonic crystals and metasurfaces can be harnessed for wavefront control, demonstrating directional emission, frequency splitting, and beam collimation through experimental and theoretical methods.

## Contribution

It introduces a unified approach to manipulate wavefronts using bound states in dielectric structures, combining theoretical analysis with experimental validation.

## Key findings

- Demonstrated directional emission via bound state coupling
- Achieved frequency splitting in dielectric metasurfaces
- Realized beam collimation through wavefront manipulation

## Abstract

We present the study of bound surface modes sustained at the termination of truncated bulk dielectric photonic crystals and isolated metasurfaces of dielectric meta-atoms. We discuss the origins of bound modes in the two systems and their relation. For both systems, we theoretically study and experimentally demonstrate wavefront manipulation, in particular directional emission, frequency splitting and beam collimation achieved by coupling of the bound states to radiation modes through leaky wave radiation mechanism using properly designed scattering gratings.

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Source: https://tomesphere.com/paper/1908.06691