Super-Dispersive Demultiplexer Design Using Positive-Negative Refraction Boundary and Hetero-Photonic Crystals

TL;DR

This paper presents a systematic design of a super-dispersive optical demultiplexer using positive-negative refraction boundaries and hetero-photonic crystals, achieving large beam divergence for specific wavelengths.

Contribution

It introduces a nearly mechanical EFC engineering method for designing super-dispersive demultiplexers with enhanced refraction properties using boundary engineering.

Findings

Achieved a 161-degree beam divergence for 1474nm to 1550nm spectrum.

Developed a two-step demultiplexer with improved refractive characteristics.

Utilized boundary engineering to simplify the design process.

Abstract

In this paper, a systematic approach is employed to design a photonic crystal with a boundary between positive and negative refraction to boost the refractive properties of the crystal. Mathematical techniques are employed to turn the process of EFC engineering into a nearly mechanical process free of trial-and-error steps. The designed demultiplexers operational characteristics are then further improved by adding a second photonic crystal with an oblique boundary. The refracted beams in the first crystal impinge on an oblique interface of the second photonic crystal to experience a change in Bloch wavenumbers and even greater refraction angles so that a novel super-dispersive two-step optical demultiplexer is made. A beam divergence of 161 degrees is obtained for an input spectrum of {\lambda}= [1474nm, 1550nm].