【Time】
13:30, April 21, 2026
【Location】
Room 716, Science Building
Personal Profile
currently serves as the Deputy Director and Chief Scientist of the Russian Quantum Center. He received his Ph.D. in Physics and Mathematics from Lomonosov Moscow State University in 2004. Over the years, he has conducted in-depth research at the frontiers of magneto-optics and nanophotonics, achieving systematic and original results in areas such as magnetic photonic crystals, plasmonic-magneto-optical coupling, and non-reciprocal optical effects.
Professor Belotelov has extensive international influence in the fields of magneto-optics and spin photonics. He was the first to propose and realize the manipulation of optical vortices and the significant enhancement of the Faraday rotation effect based on iron garnet thin films. He also developed important concepts such as the non-reciprocal plasmon-enhanced magneto-optical effect and the topological Faraday effect. His relevant research results have been published in internationally renowned journals such as Nature Nanotechnology and Physical Review Letters .
His work has effectively promoted the deep integration of magneto-optical materials, nanophotonic structures, and spin dynamics, laying an important foundation for the development of high-performance magneto-optical devices and integrated non-reciprocal optical technologies. He has made outstanding contributions to the design of magneto-optical materials and the application of functional devices.
Brief Introduction
Over the past few decades, extensive research has been conducted to enhance the magneto-optical performance of iron garnet materials and to promote the miniaturization and integration of non-reciprocal photonic devices such as isolators and circulators. Common approaches primarily include improving the intrinsic magneto-optical response of the material through elemental doping, and introducing optical resonance enhancement mechanisms via sophisticated nanostructure design. However, such schemes typically still require film thicknesses on the order of tens of micrometers to meet practical device requirements. At the same time, when enhancement is achieved by relying on resonance effects, it is often inevitably limited by a narrow operating bandwidth.
This report presents a novel Faraday rotation enhancement mechanism experimentally observed in nanoscale bismuth-substituted iron garnet thin films. The research results indicate that this effect is neither caused by elemental substitution or compositional changes, nor does it originate from photon localization or conventional optical resonances. Through systematic experimental testing combined with theoretical analysis, it was discovered that within an ultrathin region of approximately 2 nm near the air-film interface (equivalent to only a few atomic layers), the material's magneto-optical gyrotropy is significantly enhanced due to the breaking of spatial inversion symmetry at the interface, resulting in a Faraday rotation intensity approximately seven times higher than that of the bulk material.
This finding highlights the critical importance of interface effects in regulating magneto-optical responses, and provides a new pathway for achieving efficient optical field modulation based on monolayer or quasi-monolayer magnetic garnet materials, demonstrating broad application potential.
