Transformation bending device emulated by graded-index waveguide

TL;DR

This paper demonstrates that a gradient-index waveguide can emulate a transformation device, guiding visible light around sharp corners with low loss, verified through experiments and numerical simulations.

Contribution

The study introduces a method to emulate transformation devices using gradient-index waveguides with tailored thickness, enabling low-loss light guiding around sharp corners.

Findings

Successful emulation of transformation device with gradient-index waveguide

Guided visible light around sharp corners with low scattering and reflection losses

Experimental results agree well with numerical simulations

Abstract

We demonstrate that a transformation device can be emulated using a gradient-index waveguide. The effective index of the waveguide is spatially varied by tailoring a gradient thickness dielectric waveguide. Based on this technology, we demonstrate a transformation device guiding visible light around a sharp corner, with low scattering loss and reflection loss. The experimental results are in good agreement with the numerical results.