Quantum nanophotonics and optomechanics

In this paper, we demonstrated a nonlinear metal-semiconductor nanostructure with a static electric field created at the interface between its component charge carriers generated by femtosecond laser radiation. Controlling the excitation mode allowed us to influence the presence of the static electric field and modify the second harmonic generation, which in the future opens the way to all-optical control of the output radiation and ultra-fast logic transitions in a single nanoantenna.

In order to advance the development of quantum emitter-based devices, it is essential to enhance light-matter interactions through coupling between semiconductor quantum dots with high quality factor resonators. In our new paper, efficient tuning of the emission properties of HgTe quantum dots in the infrared spectral region is demonstrated by coupling them to a plasmonic metasurface that supports bound states in the continuum

New article about the group leader Mikhail Petrov and the group's projects!

Quantum emitters coupled to waveguides experience long-range interactions mediated by photons, leading to to superradiant and subradiant states, photon bound states, etc. This article by Alexandra Sheremet et al. reviews a wide range of such systems and their description by theoretical methods and insights from different fields of physics.

When does nonlinear circular dichroism appear in achiral dielectric nanoparticles? 
The paper by Anastasia Nikitina, Anna Nikolaeva and Kristina Frizyuk give an answer and a simple formula for C_nh and D_nh nanoparticle symmetries and any possible χ² materials

New outlook at the bianosotropy of the meta-atoms from the symmetry point of view from master student Mariia Poleva with Kristina Frizyuk, Kseniia Baryshnykova, Mihail Petrov, and Andrey Bogdanov. We extend the classical definition of bianisotropy to the case of higher-order multipoles and make a connection between classical and multipolar definitions of bianisotropy.

Congratulations to Ivan Toftul!

Choose your fighter: disorder or asymmetric coupling, battlefield: 1D quantum atomic array. In our recent paper published in Physics Review A Gleb Fedorovich, Danil Kornovan, Alexander Poddubny and Mihail Petrov revealed the competition between these two phenomena in the formation of localized and delocalized states.

We report photonic crystal structures as a tool for optomechanical pulling/pushing regimes switching in narrow spectral regions. The results are applicable for precise sorting of resonant nanoparticles with good tolerance to the resonant wavelengths.

Another result of the long standing collaboration with Prof. Rachel Grange, Dr. Maria Timofeeva, and Dr. Elizaveta Semenova has been accepted to Nanoscale journal. We propose controlling of the nonlinear optical signal generation via mechanical stretching of the semiconductor metaarrays. 

How to classify the mode of acoustic resonator in terms of group theory and multipole content? The recent paper by our 3rd year Bachelor students Maria Tsimoha, Valdimir Igoshin, and Anastasia Nikitina was published in Physical Reviews B journal. Many thanks to Kristina Frizyuk and Ivan Toftul for supervision of the project.   

by Vladimir Igoshin, Anastasiya Nikitina, Mariia Tsimokha