报告题目：Resonant Mie Scattering and Fano Resonances at Light Scattering by Subwavelength Particles （亚波长粒子在光散射中的米氏散射共振和法诺共振）
主讲人：俄罗斯科学家Michael I. Tribelsky 教授
Biography: Dr. Michael I. Tribelsky is Head of Laboratory for Nonlinear, Non-equilibrium and complex systems, Faculty of Physics, Lomonosov Moscow State University (MSU), Moscow, Russia and Professor at the National Research Nuclear University MEPhI, Moscow, Russia. He received BS in Physics (theoretical and mathematical physics) from the MSU in 1973, Ph.D. in Physics and Mathematics from the Moscow Institute of Physics and Technology in 1976 and Dr. Sci. (Habilitation) from Landau Institute for Theoretical Physics in 1985. In 1979 for his study of laser damage of optical glass, he received the highest national prize for junior scientists in the former Soviet Union – Leninsky Komsomol Prize. He is a former Professor at the University of Tokyo, Japan; Kyushu University, Japan; Fukui University, Japan; and Honorary Doctor of Philosophy from Yamaguchi University, Japan. He received JSPS Fellowship (Japan) and Max Plank Society Scholarships (Germany). He has published 4 book, 1 book chapters, more than 150 journal and conference publications, delivered many conference presentations and invited talks/lectures/seminars.
Resonant Mie Scattering and Fano Resonances at Light Scattering by Subwavelength Particles
Resonant light scattering by subwavelength particles attracts a lot of attention of researchers all around the world. Apart from the fundamental interest, the problem is important for numerous applications ranging from medicine to telecommunications and data storage/processing. It is well known, that the high the Q-factor of resonances the longer the transient to the steady state. Estimates show that for the typical high-Q resonances studied in subwavelength optics of nanoparticles the transient period may be as large as hundreds of the periods of the field oscillations in the incident pulse. It may be comparable (or even larger) than the duration of ultrashort pulses widely employed in the recent study of the problem. On the other hand, the theoretical description of the scattering mostly is still based on the steady state Mie solution and its various generalizations.
In this contribution, a brief survey of the recent results of the author in the unsteady high-Q resonant scattering is presented. It is shown that the unsteadiness of the scattering process may result in qualitative changes of the phenomenon both in the near field and in far field wave zones. The most attention is paid to the dynamics of the non-radiating anapole modes and dynamical Fano resonances, which are discussed in detail. Simple, analytically tractable models are proposed to describe the transient processes. Their comparison with results of the direct numerical integration of the complete set of the Maxwell equations shows that the models exhibit high accuracy in the quantitative description of the phenomenon.