Pavlo Ivanov
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View article: Model of the non-stationary thermal processes in the ground heat pump system
Model of the non-stationary thermal processes in the ground heat pump system Open
One of the main directions for improving heat supply systems is the tendency to switch to low-temperature heating systems by using heat pump units is the tendency of implementation the low-temperature heating systems based on the use of he…
View article: Resonator embedded photonic crystal surface emitting lasers
Resonator embedded photonic crystal surface emitting lasers Open
The finite size of 2D photonic crystals results in them being a lossy resonator, with the normally emitting modes of conventional photonic crystal surface emitting lasers (PCSELs) differing in photon lifetime via their different radiative …
View article: Perfection of an Energy-Economic and Environmental Parameters of the Ground Source Heat Pump Systems with Preventing Freezing of the Soil around Ground Pipes
Perfection of an Energy-Economic and Environmental Parameters of the Ground Source Heat Pump Systems with Preventing Freezing of the Soil around Ground Pipes Open
This article is devoted to the methods for perfection of energy, economic factors, environ-mental factors and work modes of the ground source heat pump systems with the account of climate conditions. The purpose of the work is to predict a…
View article: MATHEMATICAL MODELING OF NON-STATIONARY HEAT PROCESSES IN THE GROUND HEAT PUMP SYSTEM
MATHEMATICAL MODELING OF NON-STATIONARY HEAT PROCESSES IN THE GROUND HEAT PUMP SYSTEM Open
In the work, an analytical study of the efficiency of heat pumps using soil energy for heating, taking into account the climatic conditions of theregion of operation, is performed, which meets the tasks of energy saving and allows reducing…
View article: Small signal modulation of photonic crystal surface emitting lasers
Small signal modulation of photonic crystal surface emitting lasers Open
We report the small-signal characterization of a PCSEL device, extracting damping factors and modulation efficiencies, and demonstrating -3 dB modulation bandwidths of up to 4.26 GHz. Based on modelling we show that, by reducing the device…
View article: Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes
Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes Open
We report on the characterization and analysis of a GaN-based distributed feedback laser diode (DFB-LD) with 3 rd -order laterally etched sidewall gratings centered at a wavelength of 420 nm. We also compare the device parameters with two …
View article: Wide Frequency Tuning of Continuous Terahertz Wave Generated by Difference Frequency Mixing under Exciton-Excitation Conditions in a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Ga</mml:mi><mml:mi>As</mml:mi></mml:math>/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Al</mml:mi><mml:mi>As</mml:mi></mml:math> Multiple Quantum Well
Wide Frequency Tuning of Continuous Terahertz Wave Generated by Difference Frequency Mixing under Exciton-Excitation Conditions in a / Multiple Quantum Well Open
Continuous terahertz wave sources with narrow bandwidth and wide frequency tunability enable high-resolution terahertz spectroscopy and high-speed information communication. In this study, using the optical nonlinearity of excitons as the …
View article: Gallium nitride light sources for optical coherence tomography
Gallium nitride light sources for optical coherence tomography Open
The advent of optical coherence tomography (OCT) has permitted high-resolution, non-invasive, in vivo imaging of the eye, skin and other biological tissue. The axial resolution is limited by source bandwidth and central wavelength. With th…
View article: Mode control in photonic crystal surface emitting lasers through in-plane feedback
Mode control in photonic crystal surface emitting lasers through in-plane feedback Open
Mode control in photonic crystal surface emitting lasers is demonstrated through the use of distributed, varying phase feedback introduced through cleaved facets.
View article: Three-dimensional finite-difference time-domain modelling of photonic crystal surface-emitting lasers
Three-dimensional finite-difference time-domain modelling of photonic crystal surface-emitting lasers Open
We investigate the beam divergence in far-field region, diffraction loss and optical confinement factors of all-semiconductor and void-semiconductor photonic-crystal surface-emitting lasers (PCSELs), containing either InGaP/GaAs or InGaP/a…