Institute Colloquium
MEET THE EXPERT VORTEX WAVES & ORBITAL ANGULAR MOMENTUM
Prof. Vladimir R. Tuz
(V. N. Karazin Kharkiv National University)
Date: August 27, 2026
Start: 2:30 p.m.
Venue: Conference room of Leibniz IPHT
Vladimir R. Tuz is Professor and Senior Research Fellow at the Department of Theoretical Radiophysics, V. N. Karazin Kharkiv National University, Ukraine. He received his Ph.D. in Radiophysics in 2005 and his Doctor of Physical and Mathematical Sciences degree in 2013. His research focuses on the electromagnetics of complex and random media, periodic and aperiodic structures, composite materials, photonic crystals, and metamaterials, with particular interests in resonant electromagnetic phenomena, structured waves, and light-matter interactions. His recent research includes dielectric and chiral metasurfaces, trapped and toroidal modes, anapole states, bound states in the continuum, non-Hermitian photonics, and vortex waves carrying orbital angular momentum.
Alongside his academic career, Prof. Tuz has extensive engineering experience, including positions as a Software Engineer in industry and as a Senior Engineer at the Samsung Electronics R&D Institute Ukraine. He has also held research and academic positions at the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine and Jilin University, China. His work combines analytical theory, numerical computational electromagnetics, and experimental microwave characterization. Prof. Tuz is a member of Optica, SPIE, and the Ukrainian Optical and Photonic Society and serves as a reviewer for a broad range of journals in optics, photonics, electromagnetics, and nanophotonics.
Structured Electromagnetic Waves: Generation, Scattering, and Applications
Vortex electromagnetic waves carrying orbital angular momentum (OAM) offer additional degrees of freedom for controlling wave propagation and light-matter interactions. This presentation provides an overview of the generation, propagation, and interaction of vortex waves, with emphasis on their realization in the microwave regime and their potential applications. The discussion begins with the paraxial description of structured beams and Laguerre-Gaussian solutions, followed by the concepts of orbital angular momentum and vortex-wave generation. Particular attention is given to OAM antenna systems based on microstrip and dielectric resonators, including ring-shaped resonator antennas and graphene-based approaches. The interaction of vortex waves with objects and structured media is then considered through reflection, transmission, and scattering, including the excitation of resonant modes in metamaterials and metasurfaces. Finally, the application of OAM antenna systems to ground-penetrating radar is discussed, highlighting their potential for object detection and characterization. The presented framework highlights the common physical principles underlying structured electromagnetic waves across optical and microwave regimes, with particular emphasis on wavefront control and light-matter interactions.
The lecture will be given in English.
GUESTS ARE WELCOME
Contact person at Leibniz IPHT: Markus Schmidt
