Work

Disorder-induced effects on spontaneous emission from quasibound states in the continuum in regular and dimer gratings

Year: 2025

Type: article

Abstract: We investigate the spontaneous emission of a single quantum emitter coupled to quasibound states in the continuum (QBICs) supported by dielectric gratings. Using quasinormal mode theory, we calculate the radiative enhancement induced by both regular and dimer grating structures. This approach allows us to determine the optimal dimer grating and to study the impact of structural disorder on these structures. We show that structural disorder can convert symmetry-protected bound states in the continuum in regular gratings into QBICs, opening radiative channels at normal incidence. Through statistical simulations, we identify the respective roles of dimensional and positional disorder. Finally, we show that dimer gratings retain high radiative efficiency for moderate disorder strengths below $10%$. Beyond this threshold, both structures exhibit comparable efficiencies.

Source: Physical review. B./Physical review. B

DOI: 10.1103/cmdf-jdg1

Authors: Emmanuel Centeno, Victor Kalt, Rafik Smaali, Antoine Moreau

Institutions: Centre National de la Recherche Scientifique, Institut Pascal, Université Clermont Auvergne, Clermont Auvergne INP

Language: English

Topic: Photonic Crystals and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Agence Nationale de la Recherche

Award: Resonant Microstructured luminescent layers