Photonic Seminar Series: Natalia Salakhova, PhD student, Skoltech

On the 15th of March 2023, as part of the Photonic Seminar Series, we will have a PhD student from Skoltech Natalia Salakhova presenting her research on Optical properties of photonic moire lattices.

When:  On the 15th of March 2023, Wednesday, at 17:00 MSK time
Where: New Campus room E-B2-3007 BigBlueButton

About the speaker:

Natalia Salakhova received her B.S. at MIPT, and her M.S. in Photonics and Quantum materials at Skoltech joined MIPT. Currently, she is a second-year PhD student at the Nanophotonics theory group of the Skoltech Center of Photonic Science and Engineering under the supervision of Nikolay Gippius. Her research is devoted to the study of the optical properties of twisted photonic lattices.



In recent years, interest in the optical properties of twisted stacks of 2D materials and metasurfaces growths fast. In studies, one has proposed either to apply effective medium approximation or to build a transfer/scattering matrix approach for the main (0th) diffraction channel, which imposes serious restrictions on the geometry of structures. In this research, we developed a careful adaptation of the Fourier modal method for the twisted 1D gratings’ stacks that accelerates calculations and allows to consider higher-order harmonics hybridization. We use this method for the rigorous study of photonic crystals and demonstrate specific moire-associated effects.

Particularly we show that moire-periodicity in bilayer dielectric photonic crystal slabs leads to arise of extremely narrow optical resonances, which are very sensitive to the relative twist. Also, we demonstrate the change of plasmonic mode dispersion in a stack of gold lattices. We show that the twisted photonic crystal slab has a chiral response. And finally, we consider the effect of the twist between two photonic crystal slabs on the near-field radiative heat transfer and Casimir attraction.

Our results pave the wave for the utilization of moire-assisted effects in multilayer photonic crystal structures.