期刊
NANOPHOTONICS
卷 10, 期 17, 页码 4357-4371出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0340
关键词
Fano resonances; Mie scattering; resonant interference; transient response
资金
- Russian Foundation for Basic Research [20-02-00086]
- Moscow Engineering Physics Institute Academic Excellence Project (Ministry of Education and Science of the Russian Federation) [02.a03.21.0005]
- Russian Science Foundation [21-12-00151, 19-72-30012]
- Russian Science Foundation [21-12-00151] Funding Source: Russian Science Foundation
Two analytical models are introduced to describe dynamic effects at resonant light scattering by subwavelength particles, showing that sharp variations in the envelope of the incident pulse can lead to counterintuitive dynamics of the scattering. The models are applied to explain scattering of a square-envelope pulse by an infinite circular cylinder made of GaP, demonstrating intensive sharp spikes in scattering cross-sections.
We introduce two tractable analytical models to describe dynamic effects at resonant light scattering by subwavelength particles. One of them is based on a generalization of the temporal coupled-mode theory, and the other employs the normal mode approach. We show that sharp variations in the envelope of the incident pulse may initiate unusual, counterintuitive dynamics of the scattering associated with interference of modes with fast and slow relaxation. To exhibit the power of the models, we apply them to explain the dynamic light scattering of a square-envelope pulse by an infinite circular cylinder made of GaP, when the pulse carrier frequency lies in the vicinity of the destructive interference at the Fano resonances. We observe and explain intensive sharp spikes in scattering cross-sections just behind the leading and trailing edges of the incident pulse. The latter occurs when the incident pulse is over and is explained by the electromagnetic energy released in the particle at the previous scattering stages. The accuracy of the models is checked against their comparison with results of the direct numerical integration of the complete set of Maxwell's equations and occurs very high. The models' advantages and disadvantages are revealed, and the ways to apply them to other types of dynamic resonant scattering are discussed.
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