Dr. Alexander V. Uskov Profile

Dr. Alexander V. Uskov

at PN Lebedev Physical Institute

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 1 April 2020 Paper

Hot electron generation via internal surface photo-effect in structures with quantum well

Fedor Shuklin, Igor Smetanin, Igor Protsenko, Jacob Khurgin, Alexander Uskov

Proceedings Volume 11344, 113441X (2020) https://doi.org/10.1117/12.2555760

KEYWORDS: Quantum wells, Metals, Semiconductors, Interfaces, Sensors, Quantum efficiency, Systems modeling, Dielectrics, Photodetectors, Internal quantum efficiency

Read Abstract +

Proceedings Article | 23 May 2018 Presentation

An analytical approach to collective effects in nanolasers (Conference Presentation)

Emil André, Igor Protsenko, Alexander Uskov, Jesper Mørk, Martijn Wubs

Proceedings Volume 10682, 106820R (2018) https://doi.org/10.1117/12.2307100

KEYWORDS: Polarization, Free space, Numerical analysis, Statistical analysis

Read Abstract +

Traditionally, the active material in a laser is modelled as independent emitters, but in recent years it has become increasingly clear that radiative coupling between emitters can significantly change the characteristics of small lasers. Collective effects in free space such as superradiance have been studied extensively [1,2], but the effects of inter-emitter correlation in micro- and nano-cavities need further examination to be put on firm theoretical ground. Several studies of collective effects in nano-cavities have been made [3-6], but the theoretical models employed are intricate, and numerical methods are needed both to generate the dynamic equations and to solve them. We propose a model where the complexity is strongly reduced, allowing analytical solutions [7]. We consider a collection of identical two-level emitters interacting with a single cavity mode. We start from Maxwell-Bloch equations, but instead of making the typical adiabatic elimination of the polarization, we allow the polarization decay rate to be of the same magnitude or smaller than other decay rates. Hence, the traditional laser rate equations for the photon number and the population inversion must be supplemented by equations for the emitter-field correlation and the emitter-emitter correlation. This gives us four generalized laser rate equations, which we solve analytically in steady state. Comparing with the steady state results obtained from the traditional laser rate equations we see that inclusion of collective effects leads to a reduction of the photon number for small pump rates, similarly to what is found in [4]. From the generalized laser rate equations, we derive a measure of the strength of collective effects in terms of laser parameters: This describes the difference between results with and without inter-emitter correlations, and it goes smoothly to zero as we approach parameter values where the traditional laser rate equations become valid. To gain insight into the photon statistics of the laser, we construct dynamic equations for higher order correlations of operators. We derive an analytical expression for the zero-delay photon auto-correlation function, and for low pump rates we find that the interaction of emitters results in super-thermal values of the auto-correlation. This feature is observed in experiments and numerical models [4-5], and with our analytical expressions, we are able to pinpoint the parameter combinations for which the collective effects have the largest impact. Considering the same model in terms of the Fourier components of the operators, we find results for the photon number that agree well with the previous approach, while allowing computation of the linewidth. Thus, we can examine how emitter-emitter correlation affects the line broadening of the laser.

Proceedings Article | 24 February 2017 Paper

Efficient Q-switched operation in 1.64 µm Er:YAG tapered rod laser

Vadim Polyakov, Vladimir Vitkin, Alexandr Krylov, Alexander Uskov, Andrey Mak

Proceedings Volume 10082, 100821V (2017) https://doi.org/10.1117/12.2250847

KEYWORDS: Er:YAG lasers, Q switching, Energy efficiency, Rod lasers, Crystals, Laser crystals, Absorption, Erbium, Semiconductor lasers, Doping, Solid state lasers

Read Abstract +

Proceedings Article | 23 February 2017 Presentation + Paper

Electrically-driven optical antennas enabled by mesoscopic contacts

Alexander Uskov, Jacob Khurgin, Alexandre Bouhelier, Mikael Buret, Igor Protsenko, Igor Smetanin

Proceedings Volume 10102, 1010204 (2017) https://doi.org/10.1117/12.2249619

KEYWORDS: Nanowires, Photons, Optical antennas, Plasmonics, Metals, Nanostructures, Electromagnetism, Electrons, Plasmons, Surface plasmons, Optical components, Quantum efficiency, Polarization, Adaptive optics

Read Abstract +

Proceedings Article | 20 February 2017 Paper

Plasmonic superradiance of two emitters near metal nanorod

Igor Protsenko, Alexander Uskov, Xuewen Chen, Hongxing Xu

Proceedings Volume 10118, 1011811 (2017) https://doi.org/10.1117/12.2248787

KEYWORDS: Plasmonics, Quantum efficiency, Metals, Plasmonic waveguides, Nanostructures, Plasmons, Nanorods, Strontium, Nanoparticles, Absorption

Read Abstract +

Proceedings Article | 17 February 2017 Paper

Pulse-burst Er:glass laser

Vladimir Vitkin, Olga Dymshits, Vadim Polyakov, Alexander Zhilin, Darya Shemchuk, Alexandr Krylov, Alexander Uskov, Andrey Mak, Anton Kovalev

Proceedings Volume 10082, 1008224 (2017) https://doi.org/10.1117/12.2252107

KEYWORDS: Cobalt, Erbium lasers, Q switching, Q switches, Nanocrystals, Optical properties, Erbium, Ytterbium, Ions, Pulsed laser operation, Laser damage threshold, Crystals, Modes of laser operation

Read Abstract +

Proceedings Article | 17 February 2017 Paper

Highly stable RF signal from a mode-locked laser stabilized to multiple saturated absorption lines

Anton Kovalev, Alexander Uskov, Vadim Polyakov

Proceedings Volume 10082, 100821Z (2017) https://doi.org/10.1117/12.2251527

KEYWORDS: Absorption, Mode locking, Laser stabilization, Iodine, Neodymium lasers, Second-harmonic generation, Modulation, Crystals, Laser crystals, Semiconductor lasers, Mirrors

Read Abstract +

Proceedings Article | 2 May 2014 Paper

Bulk photovoltaic effect in photoconductive metamaterials based on cone-shaped nanoparticles

Sergei Zhukovsky, Viktoriia Babicheva, Alexander Uskov, Igor Protsenko, Andrei Lavrinenko

Proceedings Volume 9125, 91250W (2014) https://doi.org/10.1117/12.2052442

KEYWORDS: Nanoparticles, Plasmonics, Metamaterials, Photovoltaics, Particles, Photoelectric effect, Semiconductors, Absorption, Solar energy, Interfaces

Read Abstract +

Proceedings Article | 2 May 2012 Paper

Absorption enhancement in metal nanoparticles for photoemission current for solar cells

C. Gritti, A. Novitsky, R. Malureanu, A. V. Lavrinenko, A. V. Uskov, B. Kardynal

Proceedings Volume 8438, 84380K (2012) https://doi.org/10.1117/12.922445

KEYWORDS: Nanoparticles, Solar cells, Absorption, Semiconductors, Metals, Photons, Gold, Surface plasmons, Gallium arsenide, Photovoltaics

Read Abstract +

Showing 5 of 9 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years