Theory of photonic crystal polaritons in periodically patterned multilayer waveguides

TL;DR

This paper develops a comprehensive formalism for analyzing photonic crystal polaritons in multilayer waveguides, enabling detailed dispersion and loss characterization, and demonstrating applications in lossless mode engineering and topological properties.

Contribution

It introduces a non-Hermitian diagonalization approach for photonic crystal polaritons in patterned multilayer structures, applicable across diverse material platforms.

Findings

Polariton dispersions depend on material and lattice symmetry.

Lossless polariton modes can be engineered via excitonic coupling to bound states.

The method provides a versatile tool for designing hybrid radiation-matter states.

Abstract

We present a formalism for studying the radiation-matter interaction in multilayered dielectric structures with active semiconductor quantum wells patterned with an in-plane periodic lattice. The theory is based on the diagonalization of the generalized Hopfield matrix, and it includes loss channels in a non-Hermitian formulation. Hybrid elementary excitations named photonic crystal polaritons arise in these systems, whose detailed dispersion and loss characteristics are shown to depend on material composition as well as on symmetry properties of the lattice. We show the generality of the approach by calculating polariton dispersions in very diverse material platforms, such as multilayered perovskite-based lattices or inorganic semiconductor heterostructures. As an application of the method, we show how to engineer lossless polariton modes through excitonic coupling to bound states in the continuum at either zero or finite in-plane wavevector, and discuss their topological properties. Detailed comparison with a semiclassical approach based on the scattering matrix method is provided, which allows to interpret the optical spectra in terms of polarization-dependent excitation of the different polariton branches. This work introduces an efficient and invaluably versatile numerical approach to engineer photonic crystal polaritons, with potential applications ranging from low-threshold lasers to symmetry-protected propagating modes of hybrid radiation-matter states.