Generation of J0-Bessel-Gauss Beam by an heterogeneous refractive index map

TL;DR

This paper theoretically demonstrates a 2D graded index map capable of converting a Gaussian beam into a J0-Bessel-Gauss beam with 90% efficiency, enabling advanced optical applications within silicon photonics.

Contribution

First theoretical demonstration of a 2D refractive index map for Gaussian to J0-Bessel-Gauss beam conversion in silicon photonics.

Findings

Achieved 90% beam conversion efficiency.

Demonstrated self-regeneration and propagation through obstructions.

Validated the feasibility of integrated beam shaping in silicon photonics.

Abstract

In this paper, we present the theoretical studies of a refractive index map to implement a Gauss to J0-Bessel-Gauss convertor. We theoretically demonstrate the viability of such device by solving the inverse electromagnetic problem. The computed conversion efficiency is 90%. The theoretical results, obtained from the beam conversion efficiency, self-regeneration, and propagation through an opaque obstruction; demonstrate that a 2D graded index map of the refractive index can be used to transform a Gauss beam into a J0-Bessel-Gauss beam. To the best of our knowledge, this is the first demonstration of such beam transformation by means of a 2D index-mapping which is fully integrable in silicon photonics based planar lightwave circuits (PLC). The concept device is significant for the eventual development of a new array of technologies, such as micro optical tweezers, optical traps, beam reshaping and non-linear beam diode lasers.