Предлагаем вашему вниманию новую подборку статей сотрудников кафедры и отдела микроэлектроники, опубликованных в высокорейтинговых журналах.
- Lepikhin N. D., Popov N. A., Starikovskaia S. M. Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N2:O2 mixtures // Plasma Sources Science and Technology. — 2018. — Vol. 27, no. 4. [ DOI ]
Fast gas heating is studied experimentally and numerically in pulsed nanosecond capillary discharge in pure nitrogen and N2:O2 mixtures at conditions of high specific deposited energy (up to 1 eV/molecule) and high reduced electric fields (100-300 Td). Deposited energy, electric field and gas temperature are measured as function of time. Radial distribution of active species is analyzed experimentally. The roles of process involving N2(B)=N2(B3Πg, W3Δu, B'3Σu-), N2(A3Σu+) and N(2D) excited nitrogen species leading to heat release are analyzed using numerical modeling at 1D axial approximation. - Femtosecond laser pulse modification of amorphous silicon films: control of surface anisotropy / D. V. Shuleiko, F. V. Potemkin, I. A. Romanov et al. // Laser Physics Letters. — 2018. — Vol. 15. — P. 056001. [ DOI ]
A one-dimensional surface relief with a 1.20 ± 0.02 µm period was formed in amorphous hydrogenated silicon films as a result of irradiation by femtosecond laser pulses (1.25 µm) with a fluence of 0.15 J cm−2. Orientation of the formed structures was determined by the polarization vector of the radiation and the number of acting pulses. Nanocrystalline silicon phases with volume fractions from 40 to 67% were detected in the irradiated films according to the analysis of Raman spectra. Observed micro- and nanostructuring processes were caused by surface plasmon–polariton excitation and near-surface region nanocrystallization, respectively, in the high-intensity femtosecond laser field. Furthermore, the formation of Si-III and Si-XII silicon polymorphous modifications was observed after laser treatment with a large exposure dose. The conductivity of the film increased by three orders of magnitude at proper conditions after femtosecond laser nanocrystallization compared to the conductivity of the untreated amorphous surface. The conductivity anisotropy of the irradiated regions was also observed due to the depolarizing contribution of the surface structure, and the non-uniform intensity distribution in the cross-section of the laser beam used for modification. - Bogatskaya A. V., Volkova E. A., Popov A. M. Generation and amplification of sub-thz radiation in a plasma of rare gases formed by two-color femtosecond laser pulse // Laser Physics Letters. — 2018. — Vol. 15, no. 6. — P. 065301. [ DOI ]
A new approach to constructing the source of radiation in the sub-THz frequency range is discussed. It is based on the strong-field ionization of heavy rare gases with Ramsauer minimum in the transport cross-section by a two-color () femtosecond laser pulse. Then a four-photon nonlinear process ( are the frequencies from the spectral width of the pulse with frequency ω, and is the frequency from the spectral width of the second harmonic 2ω) with a transition to the initial state results in a low-frequency spontaneous emission that can be amplified in the strongly nonequilibrium laser plasma if the position of the photoelectron peaks is located in the region of growing energy transport cross-section. - Zakharov R. V., Tikhonova O. V. Managing the spatial properties and photon correlations in squeezed non-classical twisted light // Laser Physics Letters. — 2018. — Vol. 15, no. 5. — P. 055205. [ DOI ]
Spatial photon correlations and mode content of the squeezed vacuum light generated in a system of two separated nonlinear crystals is investigated. The contribution of both the polar and azimuthal modes with non-zero orbital angular momentum is analyzed. The control and engineering of the spatial properties and degree of entanglement of the non-classical squeezed light by changing the distance between crystals and pump parameters is demonstrated. Methods for amplification of certain spatial modes and managing the output mode content and intensity profile of quantum twisted light are suggested. - Balybin S. N., Zakharov R. V., Tikhonova O. V. Phase-sensitive atomic dynamics in quantum light // Laser Physics Letters. — 2018. — Vol. 15, no. 6. [ DOI ]
Interaction between a quantum electromagnetic field and a model Ry atom with possible transitions to the continuum and to the low-lying resonant state is investigated. Strong sensitivity of atomic dynamics to the phase of applied coherent and squeezed vacuum light is found. Methods to extract the quantum field phase performing the measurements on the atomic system are proposed. In the case of the few-photon coherent state high accuracy of the phase determination is demonstrated, which appears to be much higher in comparison to the usually used quantum-optical methods such as homodyne detection. - Plasmon induced modification of silicon nanocrystals photoluminescence in presence of gold nanostripes / S. A. Dyakov, D. M. Zhigunov, A. Marinins et al. // Scientific reports. — 2018. — Vol. 8. — P. 4911–4911.[ DOI ]
We report on the results of theoretical and experimental studies of photoluminescense of silicon nanocrystals in the proximity to plasmonic modes of different types. In the studied samples, the type of plasmonic mode is determined by the filling ratio of a one-dimensional array of gold stripes which covers the thin film with silicon nanocrystals on a quartz substrate. We analyze the extinction, photoluminesce spectra and decay kinetics of silicon nanocrystals and show that the incident and emitted light is coupled to the corresponding plasmonic mode. We demonstrate the modification of the extinction and photoluminesce spectra under the transition from wide to narrow gold stripes. The experimental extinction and photoluminescense spectra are in good agreement with theoretical calculations performed by the rigorous coupled wave analysis. We study the contribution of individual silicon nanocrystals to the overall photoluminescense intensity, depending on their spacial position inside the structure. - Resonant interaction of electromagnetic wave with plasma layer and overcoming the radiocommunication blackout problem / A. V. Bogatskaya, N. V. Klenov, M. V. Tereshonok et al. // Journal of Physics D - Applied Physics. — 2018. — Vol. 51, no. 18. — P. 185602. [ DOI ]
We present an analysis of the possibility of penetrating electromagnetic waves through opaque media using an optical-mechanical analogy. As an example, we consider the plasma sheath surrounding the vehicle as a potential barrier and analyze the overcoming of radiocommunication blackout problem. The idea is to embed a «resonator» between the surface on the vehicle and plasma sheath which is supposed to provide an effective tunneling of the signal to the receiving antenna. We discuss the peculiarities of optical mechanical analogy applicability and analyze the radio frequency wave tunneling regime in detail. The cases of normal and oblique incidence of radiofrequency waves on the vehicle surface are studied. - Smoke aerosol chemistry and aging of siberian biomass burning emissions in a large aerosol chamber / A. C. Kalogridis, O. B. Popovicheva, G. Engling et al. // Atmospheric Environment. — 2018. — Vol. 185. — P. 15–28. [ DOI ]
Vegetation open fires constitute a significant source of particulate pollutants on a global scale and play an important role in both atmospheric chemistry and climate change. To better understand the emission and aging characteristics of smoke aerosols, we performed small-scale fire experiments using the Large Aerosol Chamber (LAC, 1800 m3) with a focus on biomass burning from Siberian boreal coniferous forests. A series of burn experiments were conducted with typical Siberian biomass (pine and debris), simulating separately different combustion conditions, namely, flaming, smoldering and mixed phase. Following smoke emission and dispersion in the combustion chamber, we investigated aging of aerosols under dark conditions. Here, we present experimental data on emission factors of total, elemental and organic carbon, as well as individual organic compounds, such as anhydrosugars, phenolic and dicarboxylic acids. We found that total carbon accounts for up to 80% of the fine mode (PM2.5) smoke aerosol. Higher PM2.5 emission factors were observed in the smoldering compared to flaming phase and in pine compared to debris smoldering phase. For low-temperature combustion, organic carbon (OC) contributed to more than 90% of total carbon, whereas elemental carbon (EC) dominated the aerosol composition in flaming burns with a 60–70% contribution to the total carbon mass. For all smoldering burns, levoglucosan (LG), a cellulose decomposition product, was the most abundant organic species (average LG/OC = 0.26 for pine smoldering), followed by its isomer mannosan or dehydroabietic acid (DA), an important constituent of conifer resin (DA/OC = 0.033). A levoglucosan-to-mannosan ratio of about 3 was observed, which is consistent with ratios reported for coniferous biomass and more generally softwood. The rates of aerosol removal for OC and individual organic compounds were investigated during aging in the chamber in terms of mass concentration loss rates over time under dark conditions and compared to the loss rate of EC. The latter is used as an inert tracer for estimating aerosol mechanical deposition and wall losses of the otherwise chemically conserved aerosol species. The OC/EC ratio increased with smoke aging for the flaming phase, suggesting a production/partitioning of organic compounds after emission. On the other hand, for smoldering burns OC/EC ratios decreased further with aging due to additional sinks of OC, other than those related to deposition and wall losses alone, such as evaporation of semi-volatile compounds. The chemical fingerprints of the major PM components of fresh and aged smoke found in this study are proposed to be used for the assessment of contributions from Siberian biomass burning to atmospheric pollution in source apportionment studies like those using molecular marker approaches.
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