A deterministic approach for integrating an emitter in a nanocavity with subwavelength light confinement

TL;DR

This paper presents a new nanophotonic platform integrating a nanoscale emitter into a dielectric bowtie cavity, achieving deep subwavelength light confinement and strong light-matter interaction.

Contribution

It introduces a novel integration method and a confinement-factor approach for predicting coupling, enabling deterministic strong coupling in solid-state nanophotonics.

Findings

Predicts coupling strengths of 0.4-0.7 meV for gap sizes of 50-10 nm.

Demonstrates the platform's compatibility with scalable fabrication.

Reveals design rules inaccessible to traditional dipole metrics.

Abstract

We introduce a novel light-matter interface that integrates a nanoscale buried heterostructure emitter into a dielectric bowtie cavity, co-localising the optical hotspot and the electronic wavefunction. This platform enables strong light-matter interaction through deep subwavelength confinement while remaining compatible with scalable fabrication. We show that in this regime an explicit treatment of the emitter's spatial extent is required, and that a confinement-factor approximation more accurately predicts the coupling, revealing design rules inaccessible to dipole-based metrics. For an InP/InGaAsP system, we predict coupling strengths of 0.4-0.7 meV for gap sizes of 50-10 nm, establishing the buried heterostructure-bowtie architecture as a practical route to deterministic strong coupling in solid-state nanophotonics.