Investigations of Bragg reflectors in nanowire lasers

TL;DR

This paper investigates the reflectivity of Bragg gratings in nanowire lasers and waveguides, using a semi-analytical model to compare geometries and understand diffraction effects, highlighting advantages of in-waveguide reflectors.

Contribution

It introduces a semi-analytical model to analyze diffraction effects in Bragg reflectors within nanowire lasers, comparing geometries to identify optimal configurations.

Findings

Bragg reflectors within waveguides outperform substrate reflectors when diffraction is significant.

The semi-analytical model enhances understanding of diffraction effects in nanowire laser gratings.

In-waveguide Bragg reflectors offer significant advantages over substrate gratings.

Abstract

The reflectivity of various Bragg reflectors in connection to waveguide structures, including nanowires, has been investigated using modal reflection and transmission matrices. A semi-analytical model was applied yielding increased understanding of the diffraction effects present in such gratings. Planar waveguides and nanowire lasers are considered in particular. Two geometries are compared; Bragg reflectors within the waveguides are shown to have significant advantages compared to Bragg reflectors in the substrate, when diffraction effects are significant.