Quantization of optical quasinormal modes for spatially separated cavity systems with finite retardation

• URL: http://arxiv.org/abs/2404.07741v2
• Date: Wed, 11 Sep 2024 12:19:46 GMT
• Title: Quantization of optical quasinormal modes for spatially separated cavity systems with finite retardation
• Authors: Robert Fuchs, Juanjuan Ren, Sebastian Franke, Stephen Hughes, Marten Richter,
• Abstract summary: A multi-cavity quantization scheme is developed using quasinormal modes (QNMs) of optical cavities embedded in a homogeneous background medium. We define a measure to determine if a separate quantization of QNM cavities is justified or if a joint quantization of the system is necessary.
• Score: 2.398404904803803
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A multi-cavity quantization scheme is developed using quasinormal modes (QNMs) of optical cavities embedded in a homogeneous background medium for cases where retardation is significant in the inter-cavity coupling. Using quantities that can be calculated in computational optics with numerical Maxwell solvers, we extend previous QNM quantization schemes and define a quantitative measure to determine if a separate quantization of QNM cavities is justified or if a joint quantization of the system is necessary. We test this measure for the examples of two coupled one-dimensional dielectric slabs and a dimer of metal nanorods acting as QNM cavities. For sufficiently large separations, the new scheme allows for an efficient treatment of multi-cavity phenomena using parameters defined for the individual cavities. Formulating the Hamiltonian in a familiar system-bath form, the scheme connects the rigorous QNM theory and widespread phenomenological models of open cavities coupled to a shared photonic bath with parameters obtained directly from Maxwell calculations.

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