Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
77
19
2018
DEPENDENCE OF FLUORESCENT CHARACTERISTICS OF NANOCOMPOSITES ON THE BASIS OF DYE MOLECULES AND SILVER NANOPARTICLES ON THE OPTICAL DENSITY OF COMPONENTS
1675-1683
10.1615/TelecomRadEng.v77.i19.10
S. V.
Nikolaev
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. V.
Pozhar
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
M. I.
Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
K. S.
Nikolaev
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
laser dye
nanoparticles
plasmon resonance
fluorescence
It is known that the addition of plazmon metal nanoparticles to the lasant can be used to improve the radiative characteristics of the medium. However, the problem of the influence of the component ratio on the intensity of the nanocomposites fluorescence, which is relevant from applied point of view, has not been well investigated and requires additional studies. In this paper, the fluorescence of the solutions of the Rhodamine 6G and Rhodamine C dyes at different excitation wavelengths when there are silver nanoparticles is investigated. The effect of the mixture components concentration on the fluorescence amplification coefficient of the dye molecules is studied. It is shown that one can consider the relative optical density of the mixture components, which is the ratio of the optical density of the nanoadditive to the optical density of the dye at the excitation wavelength, as a generalized parameter that has influence on the fluorescent characteristics of nanocomposites. The relative optical density is maximized
with increase in the concentration of nanoparticles as well as with decrease of the concentration of the dye or in the case of excitation by radiation with the spectrum closest to the maximum of plasmon resonance of nanoparticles. In this case, the increase in the fluorescence amplification coefficient is observed. If the pumping spectrum is far from the wavelength of maximum of the plasmon resonance, the concentration of the nanoparticles is low, and the dye concentration is high, then the relative optical density is small, the fluorescence gain becomes insignificant, and even its quenching may occur. The results of these studies allow us to formulate a general approach to assessing the effect of the components ratio of mixtures composed of dye molecules and metallic nanoparticles on the fluorescence intensity of fluorophore molecules.
OPTIMIZATION OF THERMAL REGIME OF CONTINUOUS CO-LASERS WITH DIFFUSION COOLING
1685-1695
10.1615/TelecomRadEng.v77.i19.20
A. V.
Vasianovych
Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
A. S.
Gnatenko
Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
D. V.
Pustylnikov
Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv, 61166, Ukraine
laser
temperature
recombination
atom
gas
concentration
current density
Mathematical methods for optimizing parameters of the CO2-laser, realized using numerical computer simulation, are proposed. The results of numerical calculations coincide with the results of the experimental data, at a partial discrepancy, the reasons associated with the non-optimal consideration of the proposed recombination model on the wall of the O-tube in the reaction
O + Ow→O2 were established. The results of the work can be fully used to optimize various designs of continuous CO2-lasers.
METHOD FOR MEASURING QUANTUM PHASE NOISE AND LINE WIDTH OF WORKING TRANSITION OF RADIO- OPTICAL SYSTEM OF RANDOM NUMBER GENERATOR
1697-1717
10.1615/TelecomRadEng.v77.i19.30
О. P.
Nariezhnii
V. Karazin National University of Kharkov,
4 Svoboda Sq., Kharkiv, 61022, Ukraine
Valerii
Semenets
Kharkiv National University of Radio Electronics
Т. О.
Grinenko
Kharkov National University of Radio Engineering and Electronics,
14 Nauka Ave, Kharkiv, 61166, Ukraine
quantum random number generator
double radio optical resonance method
quantum phase noise
quantum measure of frequency
Results of comprehensive theoretical and experimental studies on creation of a Quantum Random Number Generator prototype based on the implementation of double radio optical resonance in the vapour of the rubidium isotope are presented. A method is developed for the analytical and numerical solution of the coupled-mode Quantum Random Number Generator equation, which describes the mode of interaction of quantum generators in the process of measuring their parameters. A feature of the proposed method is the possibility of studying quantum phase noise and the width of the quantum discriminators line on alkali metal vapours
in the presence of an interaction error.
THERMAL ACTION OF MICROWAVE RADIATION ON A VERY THIN CONDUCTIVE FIBER
1719-1727
10.1615/TelecomRadEng.v77.i19.40
N. G.
Kokodiy
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022,
Ukraine; National University of Pharmacy, 53 Pushkinkaya St., Kharkiv, 61027,
Ukraine
М. V.
Kaydash
I. Kozhedub Kharkiv National Air Force University, 77/79 Sumska St., Kharkiv 61023, Ukraine
S. V.
Pogorelov
National University of Pharmacy, 53 Pushkinskaya St., Kharkiv 61027, Ukraine
microwave radiation
thin fiber
heating
absorption efficiency
The paper presents experimental findings of a new physical effect arising as a result of a strong interaction of microwave radiation with very thin (d << λ) conductive fibers. The calculations show that the absorption efficiency factor of a fiber having a diameter of several micrometers,
being exposed to radiation in a centimeter range, can reach the value of several hundreds. It was found that the effect can be enhanced by oblique incidence of the radiation beam. An experiment to measure the absorption of microwave radiation with a wavelength of 1 cm in a graphite fiber of 12 μ;m in diameter has been carried out. To determine the radiation absorption in a fiber its resistance changing under radiation heating was measured. To reduce the error of results, the average value of resistance for 1 minute with a frequency of 2 Hz was measured. A thermal image of the heated fiber was observed using a thermal imager. A mathematical model of the process of fiber heating with a radiation beam has been developed. It has been shown experimentally that a graphite fiber with 12 μ;m in diameter absorbs about 10% of the energy of the incident microwave beam having a wavelength of 1 cm. The heating temperature at the beam incidence point reaches 200 °C. The developed mathematical model describes well the radiation-fiber interaction process. Investigation results confirm the existence of a strong interaction between the microwave radiation and very thin conductive fibers. The effect under consideration can be applied in facilities in order to transfer the electromagnetic radiation energy for small targets. Another use of this effect is the creation of protective screens against the microwave radiation effect on humans or on different facilities.
SURFACE-BARRIER UV DETECTORS BASED ON WIDE BANDGAP SEMICONDUCTORS
1729-1733
10.1615/TelecomRadEng.v77.i19.50
Victor P.
Makhniy
Yuri Fedkovych Chernivtsi National University, 2 Kotsyubynsky St., Chernivtsi, 58012, Ukraine
V. V.
Melnyk
Yuriy Fedkovych Chernivtsi National University, Kotsubinsky Str., 2, Chernivtsi, 58012, Ukraine
Yu. V.
Vorobiev
Centro de Investigaciony de Estudios Avanzados del IPW (CINVESTAN) Queretaro, Ubraimento Norponiente 2000, Fracc. Real de Iuriquilla, 76230 Queretaro, Mexico
ultraviolet (UV)
zinc selenide
surface-barrier diode
high sensitivity
We report on successful development of surface-barrier diodes based on zinc selenide. The use carrier injection amplification allowed improvement of device sensitivity up to amplification coefficient of 20 A/W at wavelength of 0.25 μ;m.
SOLID-STATE COMPONENTS AND DEVICES OF TERAHERTZ ELECTRONIC TECHNOLOGY IN UKRAINE
1735-1766
10.1615/TelecomRadEng.v77.i19.60
N. F.
Karushkin
State-owned Enterprise Scientific Research Institute "Orion", 8a Eu. Pottier St., Kyiv 03680, Ukraine
terahertz band
oscillator
detector
amplifier
p–i–n-modulator
transmission line
radio vision
One of the main problems arising in the implementation of the terahertz band is associated with the need to provide the advanced equipment developed in this frequency band with effective electronic components. This paper provides a comparative analysis of the characteristics of the terahertz band components, based on the solid-state elements and waveguide electrodynamic structures. The features of design solutions in the process of creating semiconductor components and devices, such as oscillators, amplifiers, frequency multipliers, power meters, transmission lines, and devices for modulating electromagnetic waves using p–i–n-structures, are shown. The main directions of practical application of apparatus and equipment of the terahertz band are considered. The attractiveness of the terahertz band to create high-speed communication systems, high-resolution radar, radio vision systems, remote identification devices of substances, and other special and civil engineering, is shown. The provided data indicate the potential capabilities of leading Ukrainian enterprises in solving the problems of exploring the terahertz frequency range.