Cavity-coupled guided resonances with high quality factors in photonic crystal heterostructures

TL;DR

This paper investigates high-Q cavity-coupled guided resonances in photonic crystal heterostructures, demonstrating ultra-low threshold lasing potential and narrow band filtering capabilities through theoretical and numerical analysis.

Contribution

It introduces a novel photonic crystal heterostructure design that achieves high-quality guided resonances with Q factors around 10^6, enabling ultra-low threshold lasing.

Findings

Q factor of resonances is about 10^6

Significant reduction in lasing threshold compared to defect modes

Field distribution analysis distinguishes defect modes from guided resonances

Abstract

We study the optical characteristics of a photonic crystal (PhC) heterostructure cavity consisting of two-dimensional monolayer PhC, sandwiched between two identical passive multilayers. In the range of stopband of the multilayer, guided resonance of the sandwiched PhC are excited by the evanescent waves of the multilayer stack and the quality factor of these cavity-coupled guided resonances is about 10e6. The calculated field distribution facilitates the distinction between the cavity defect modes and the coupled guided resonances of the proposed design. The line shapes of the resonances are explained using a theoretical model. Significant decrease in the lasing threshold is observed for these resonant modes in comparison to the defect modes. These results will find use in designing compact PhC-based ultra-low threshold lasers and narrow band filters.