# Controllable selective coupling of Dyakonov surface wave at liquid crystal based interface

## TL;DR

This paper demonstrates a method to selectively couple Dyakonov surface waves at a liquid crystal interface by controlling anisotropy with a magnetic field, enabling potential advances in integrated photonic devices.

## Contribution

It introduces an experimental technique for controllable, selective Dyakonov surface wave coupling at a liquid crystal interface using magnetic field manipulation.

## Key findings

- Selective surface wave coupling achieved at specific incident angles.
- Magnetic field controls anisotropy to enable coupling.
- Potential for integration into photonic circuits.

## Abstract

Highly directional and lossless surface wave has significant potential applications in the two-dimensional photonic circuits and devices. Here we experimentally demonstrate a selective Dyakonov surface wave coupling at the interface between a transparent polycarbonate material and nematic liquid crystal 5CB. By controlling the anisotropy of the nematic liquid crystal with an applied magnetic field, a single ray at a certain incident angle from a diverged incident beam can be selectively coupled into surface wave. The implementation of this property may lead to a new generation of on-chip integrated optics and two-dimensional photonic devices.

---
Source: https://tomesphere.com/paper/1907.12181