Dispersion properties of a nanophotonic Bragg waveguide with finite aperiodic cladding

TL;DR

This paper investigates the dispersion properties of a novel nanophotonic Bragg waveguide with a finite aperiodic cladding arranged according to the Kolakoski rule, revealing how aperiodicity influences guided mode behavior.

Contribution

It provides a comprehensive analysis of guided modes in a new type of waveguide with aperiodic mirrors, highlighting the impact of aperiodicity on dispersion characteristics.

Findings

Dispersion characteristics are strongly affected by aperiodicity.

Mode profiles depend on the aperiodic arrangement.

Bandgap conditions are derived using transfer matrix formalism.

Abstract

A comprehensive analysis of guided modes of a novel type of a planar Bragg reflection waveguide which consists of a low refractive index guiding layer sandwiched between two finite aperiodic mirrors is presented. The layers in the mirrors are aperiodically arranged according to the Kolakoski substitution rule. In such a waveguide light is confined inside the core by Bragg reflection from the mirrors, while dispersion characteristics of guided modes strongly depend on aperiodicity of the cladding. Using the transfer matrix formalism bandgap conditions, dispersion characteristics and mode profiles of the guided modes of such Bragg reflection waveguide are studied.