Completeness and divergence-free behavior of the quasi-normal modes using causality principle
arXiv:1802.05230 · doi:10.1364/OSAC.1.000340
Abstract
A fundamental feature of the quasi-normal modes (QNMs), which describe light interaction with open (leaky) systems like nanoparticles, lies in the question of the completeness of the QNMs representation and in the divergence of their field profile due to their leaky behavior and complex eigenfrequency. In this article, the QNMs expansion is obtained by taking into consideration the frequency dispersion and the causality principle. The derivation based on the complex analysis ensures the completeness of the QNMs expansion and prevents from any divergence of the field profile. The general derivation is tested in the case of a one-dimensional open resonator made of a homogeneous absorptive medium with frequency dispersion given by the Lorentz model. For a harmonic excitation, the result of the QNMs expansion perfectly matches the exact formula for the field distribution outside as well as inside the resonator.
arXiv comment9 Pages, 5 figures
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- Dynamical quasinormal mode excitation
- Quantization of optical quasinormal modes for spatially separated cavity systems with finite retardation
- Extending completeness of the eigenmodes of an open system beyond its boundary, for Green's function and scattering-matrix calculations
- Rigorous theory of coupled resonators
- Green's function expansion for multiple coupled optical resonators with finite retardation using quasinormal modes
- Quasinormal modes expansions for nanoresonators made of absorbing dielectric materials: study of the role of static modes
- A scalar product for the radiation of resonant modes