Reconfigurable resonance trapping in single optical microresonators

Le résumé fourni par la source

External coupling via the continuum, a general concept in non-Hermitian physics, underpins fascinating phenomena such as bound states in the continuum and the Kerker effect. In optics, investigations of parametric bound states have been extended from multi-resonator systems to single units, such as supercavity modes in a Mie resonator. For single high-Q optical microresonators, prior research has primarily focused on internal coupling within the residing mode pair with broken degeneracy. Here, we revisit this classical two-mode coupling model by revealing its subtle connection to mode dissipation through the radiation continuum as a hidden dimension. This implication gets exemplified in a regular microring resonator with a mode-mismatch segment, enabling reconfigurable internal and external coupling. Furthermore, external coupling-induced resonance trapping features coherently suppressed decay channels. As a demonstration, tailoring spontaneous emission via resonance trapping is experimentally observed in rolled-up microresonators. We envisage that elucidating external coupling in single resonators will offer new perspectives for advancing non-Hermitian photonics and understanding resonances spanning mechanical, photonic, electronic, and hybrid systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.