arXiv subjects

Igor V. Ryzhov

Publications and source records attributed to Igor V. Ryzhov.

4 recordsLinked to original sources

arXiv2020

High reflectance and optical dynamics of a metasurface comprizing quantum $Λ$-emitters

In this Letter, we study theoretically reflectance of a monolayer comprizing regularly spaced quantum $Λ$-emitters. Due to high density of the latter, the monolayer almost totally reflects the incident field in the vicinity of the system's collective (excitonic) resonance. The emitter self-action through the secondary field provides a positive feedback, interplay of which with the inherent nonlinearity of an emitter itself, results in an exotic behavior of the system reflectance, including bistability, self-oscillations, and chaotic dynamics. All these features might be of interest for nanophotonic applications

cond-mat.mes-hall↗

arXiv2020

Quantum metasurfaces with periodic arrays of $Λ$-emitters

We study theoretically the optical response of a monolayer comprizing regularly spaced quantum emitters with a doublet in the ground state (the so-called $Λ$-emitters). The emitters' self-action through the retarded dipole-dipole interaction provides a positive feedback, interplay of which with the intrinsic nonlinearity of an isolated emitter, leads to an exotic optical dynamics of the system and prominent effects, such as multistability, self-oscillations, and quasi-chaotic behavior. %The bifurcation diagram approach is used to classify different scenarios of the system's behavior. In a certain spectral domain, the monolayer operates as a bistable mirror. The optical response of the monolayer manifests high sensitivity to the doublet splitting and relaxation within the doublet, suggesting the latter to be the key parameters to tailor the monolayer optical response. These properties make such a system very promising for nanophotonic applications. We discuss the relevance of the predicted nonlinear effects for nano-sized all-optical devices.

cond-mat.mes-hall↗

arXiv2019

Nonlinear optical response of a two-dimensional quantum-dot supercrystal: Emerging multistability, periodic and aperiodic self-oscillations, chaos, and transient chaos

We conduct a theoretical study of the nonlinear optical response of a two-dimensional semi-conductor quantum dot supercrystal subjected to a quasi-resonant continuous wave excitation. Aconstituent quantum dot is odeled as a three-level ladder-like system (comprising the ground, theone-exciton, and the bi-exction states). To study the stationary response of the supercrystal, wepropose an exact linear parametric method of solving the nonlinear steady-state problem, whileto address the supercrystal optical dynamics qualitatively, we put forward a novel method to cal-culate the bifurcation diagram of the system. Analyzing the dynamics, we demonstrate that thesupercrystal can exhibit multistability, periodic and aperiodic self-oscillations, and chaotic behavior,depending on parameters of the supercrystal and excitation conditions. The effects originate fromthe interplay of the intrinsic nonlinearity of quantum dots and the retarded inter-dot dipole-dipoleinteraction. The latter provides a positive feedback which results in the exotic supercrystal opticaldynamics. These peculiarities of the supercrystal optical response open up a possibility for all-opticalapplications and devices. In particular, an all-optical switch, a tunable generator of THz pulses (inself-oscillating regime), a noise generator (in chaotic regime), and a tunable bistable mirror can bedesigned.

physics.optics↗

arXiv2018

Nonlinear optical response of a two-dimensional quantum dot supercrystal: Emerging multistability, periodic/aperiodic self-oscillations, and hyperchaos

We study theoretically the nonlinear optical response of a two-dimensional semiconductor quantum dot supercrystal under a resonant continuous wave excitation. A single quantum dot is modeled as a three-level ladder-like system with the ground, one-exciton, and bi-exction states. We propose an exact linear parametric method of solving the nonlinear steady-state problem. It is demonstrate that the system may exhibit multistability, periodic and aperiodic self-oscillations, and hyperchaotic behavior, depending on the system's parameters and frequency of excitation. The effects originate from the retarded dipole-dipole interaction of quantum dots. The latter provides a positive feedback which, in combination with the nonlinearity of SQDs, leads to an exotic nonlinear dynamics of the system indicated above. We discuss relevance of the underlined effects for nanosized all-optical devices. In particular, a quantum dot supercrystal may serve as a nanosized all-optical switch, a tunable generator of trains of THz pulses (in self-oscillating regime), as well as a noise generator (in chaotic regime) at the nanoscale. We show also that the supercrystal can operate as a bistable mirror. All this suggests various nanophotonic applications of such type of materials.

physics.optics↗