Терагерцевое и микроволновое излучение: генерация, детектирование и приложения (ТЕРА)
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- ПубликацияОткрытый доступ01_The 5-th International Conference TERAHERTZ AND MICROWAVE RADIATION: GENERATION, DETECTION AND APPLICATIONS (TERA-2023) 27 February — 2 March 2023, Moscow, Russia ABSTRACT BOOK(2023)The abstracts of reports of the 5th International Conference “Terahertz and Microwave Radiation: Generation, Detection and Applications” (TERA-2023). TERA-2023 conference is devoted to the discussion of fundamental and applied problems related to the generation and detection of terahertz and microwave radiation as well as its interaction with matter. The purpose of the conference is to discuss theoretical and experimental scientifi c results in the fi eld of mi crowave and terahertz electromagnetic wave technologies, organize an expert platform for discussion and formation of development vectors in the subject area of the conference.
- ПубликацияОткрытый доступACCELERATION OF A RELATIVISTIC ELECTRON IN A UNIPOLAR PULSE(НИЯУ МИФИ, 2023) Gavrilenko, D. V.; Potylitsyn, A. P.; Tishchenko, A. A.; Гавриленко, Дмитрий Владимирович; Потылицын, Александр Петрович; Тищенко, Алексей АлександровичUnipolar pulses of electromagnetic radiation — the waves with practically constant electric fi eld — were suggested by Bessonov in 1981 [1], and called “strange waves” even by the author.
- ПубликацияОткрытый доступDYNAMICS OF CHARGE CARRIERS IN THZ PHOTOCONDUCTIVE ANTENNAS BASED ON SI-DOPED GAAS (111)A(НИЯУ МИФИ, 2023) Galiev, G.; Klimov, E.; Pushkarev, S.; Yuzeeva, N.; Klochkov, A.; Solyankin, P.; Shkurinov, A.; Клочков, Алексей НиколаевичThe planar photoconductive dipole antennas (PCAs) with 20 μm gap were fabricated by photolithography on the following photoconductive materials: GaAs:Si layer 0.86 μm thick grown by molecular beam epitaxy on GaAs (111)A substrate at 380 °C (sample # 1000), i-GaAs layer 1.01 μm thick grown on GaAs (100) and (111)A substrates at 240 °C (LTG-GaAs, samples # 27V). Samples 27V were annealed at a temperature of 560 °C for 30’ in an As4 fl ow, sample 1000 wasn’t annealed.
- ПубликацияОткрытый доступOPTICAL CHARACTERIZATION OF GETE2 PHASE CHANGE MATERIAL FOR TERAHERTZ APPLICATIONS(НИЯУ МИФИ, 2023) Konnikova, M.; Khomenko, M.; Tverjanovich, A.; Bereznev, S.; Mankova, A.; Parashchuk, O.; Vasil’evskii, I.; Ozheredov, I.; Shkurinov, A.; Bychkov, E.; Васильевский, Иван СергеевичRecently, photonics of phase-exchange materials (PCMs) has become a new research fi eld as the opti-cal properties of PCMs change during the amorphous-crystalline phase transition [1]. Activation of PCMs phase transition is possible by thermal, electrical or optical eff ects on the material [2]. The phase transition principles can be used in terahertz (THz) metamaterials [3], aff ecting their spectral characteristics [4]. By controlling the crystal fraction of the PCM fi lm, multilevel nonvolatile te-rahertz resonance switching states with long retention times can be realized. We investigated the optical, infrared (IR), and THz permittivity properties of thin fi lms of a new PCM GeTe2 during insulator-to-metal transition. Studies of the amorphous and crystalline phases as well as THz spectra are presented and studied using Lorentz and Drude models. It is proposed that the state of GeTe2 can be monitored by observing the intensity characteristics of the 155 cm-1 Raman peak. Molecular dynamics simulations showed that during crystallization, the intensity of the 155 cm-1 mode attributed to Te-Te stretching decreases and disappears during complete crystallization. Using the example of the new GeTe2 PCM, we demonstrate that the properties of PCM-based metasurfaces can be specifi ed at the initial design stage and modifi ed at the experimental stage. It has been shown that this PCM characteristic is of particular interest for achieving dynamic and tunable metasurface functionality. This work was supported in part by the Ministry of Science and Higher Education of the Russian Federation (Grant No. 075-15-2021-1353) for the PCM material characterization; in part by the Interdisciplinary Scientifi c and Educational School of Lomonosov Moscow State University “Photonic and Quantum Technologies: Digital Medicine” for the sensor creation; in part by the European Union through the European Regional Development Fund project “Center of Excellence” TK141 for the thin fi lm preparation; and in part by the Ministry of Science and Higher Education within the State assignment FSRC “Crystallography and Photonics” RAS for the developements and prospects of THz photonics. The experimental Raman spectra were obtained at Lomonosov Moscow State University using the equipment purchased within the Lomonosov Moscow State University Program of Development.
- ПубликацияОткрытый доступRADIATION FROM A METASURFACE AS AN INSTRUMENT FOR ELECTRON BUNCH DIAGNOSTICS(НИЯУ МИФИ, 2023) Tishchenko, A. A.; Sergeeva, D. Yu.; Тищенко, Алексей Александрович; Сергеева, Дарья ЮрьевнаRadiation from electron bunches is usually used for diagnostics of its transverse sizes in accelerators and colliders including FELs and synchrotron injectors [1,2]. However, the methods of diagnostics continue to improve. There are some ideas on single-short diagnostics, or non-destructive diagnostics, or using new types of targets, among which metamaterials and photonic crystals seem to be attractive. In this report we suggest using incoherent transition radiation from two-periodical targets in order to defi ne transversal sizes of the bunch. Usually the diagnostics is reduced to comparison the measured data to the theoretical one, which take in account the coherent eff ects [3,4]. The generally accepted approach to take into account coherence from electron bunches consists in multiplying the radiation intensity from one particle by the bunch form-factor, which takes into account its size, shape, and distribution of electrons. We show that in polarization radiation for a wide class of structures, such as photonic crystals and metasurfaces, this approach is incorrect [5,6].
- ПубликацияОткрытый доступRADIOVISION IN THE TERAHERTZ RANGE: PROBLEMS AND PROSPECTS(НИЯУ МИФИ, 2023) Chistyakov, A. A.; Akmalov, A. E.; Kotkovskii, G. E.; Kozlovskii, K. I.; Maksimov, E. M.; Martynov, I. L.; Osipov, E. V.; Kuzishchin, Yu. A.; Plekhanov, A. A.; Осипов, Евгений Валерьевич; Козловский, Константин Иванович; Котковский, Геннадий Евгеньевич; Мартынов, Игорь Леонидович; Максимов, Евгений Михайлович; Чистяков, Александр Александрович; Акмалов, Артём ЭдуардовичAn analysis of the current state of research and development in the fi eld of radiovision for the terahertz range of electromagnetic radiation was carried out in the work. Various sources of terahertz radiation are considered: photoconductive antennas, IMPATT diodes, Schottky diodes, and others, as well as modern video cameras for this range and their main characteristics for recording and studying THz images in various spectral regions. The results of studies of the intensity distribution in THz radiation beams at diff erent wavelengths for photoconductive antennas using THz radiovision, as well as the possibilities of studying scattering processes during refl ection and transmission of THz radiation for various materials, are presented.
- ПубликацияОткрытый доступSCATTERING OF THE FIELD OF FAST ELECTRONS ON COUPLED NANOPARTICLES(НИЯУ МИФИ, 2023) Garaev, D. I.; Sergeeva, D. Yu.; Tishchenko, A. A.2D slab photonic crystals are being actively studied not only for their interaction with electromagnetic waves, but also with charged particles. Interacting with electrons, they can produce THz radiation, with characteristics depending on the electron beam sizes. So, such targets can serve as a promising instrument for the electron beam diagnostics.
- ПубликацияОткрытый доступSENSITIVITY OF THE HUMAN NEURONAL-STEM-LIKE CELLS TO THZ RADIATION(НИЯУ МИФИ, 2023) Sitnikov, D. S.; Ilina, I. V.; Revkova, V. A.; Gurova, S. A.; Konoplyannikov, M. A.; Kalsin, V. A.; Baklaushev, V. P.Recent progress in developing high-power sources of THz radiation have resulted in an exponential increase of the number of studies of induced biological eff ects in cells (see the reviews [1,2]). In this report a system for longterm cell irradiation [3] was used for exposure of human neural progenitor cells (drNPCs) and neuroblastoma cells (SK-N-BE (2)) to high-power pulses of THz radiation.
- ПубликацияОткрытый доступSYNTHESIS OF RADIO IMAGES BY MICROWAVE PHOTONICS METHODS(НИЯУ МИФИ, 2023) Valuev, V.; Kulagin, V.; Ryzhuk, R.; Kargin, N.; Cherepenin, V.; Каргин, Николай Иванович; Валуев, Виктор Васильевич; Рыжук, Роман ВалериевичThe radio vision is the most promising method for the maximum possible information about objects to obtain. Below are the basic methods for image synthesis by means of the radio vision: 1. Method of holography. The reference microwave signal is added to the microwave echo signal and then the intensity of an interference pattern is measured and digitized. After digital processing, the image of the object is reconstructed. 2. A method for determining the amplitude-phase distribution in the receiving antenna opening and obtaining an image of the object after digital data processing. 3. The inverse synthetic aperture radar (ISAR) method. This method uses versatile signal processing technique rather than large aperture antennas to identify and reconstruct a moving target. 4. The MIMO (multiple inputs, multiple outputs) method based on distributed radar network.
- ПубликацияОткрытый доступTHZ QUANTUM CASCADE LASERS WITH TWO-PHOTON DESIGN(НИЯУ МИФИ, 2023) Khabibullin, R. A.; Pushkarev, S. S.; Galie, R. R.; Ponomarev, D. S.; Vasil’evskii, I. S.; Vinichenko, A. N.; Klochkov, A. N.; Bagaev, T. A.; Ladugin, M. A.; Marmalyuk, A. A.; Maremyanin, K. V.; Gavrilenko, V. I.; Ushakov, D. V.; Afonenko, A. A.; Клочков, Алексей Николаевич; Виниченко, Александр Николаевич; Васильевский, Иван СергеевичThe possibility of implementing two radiation transitions in the gain module for THz QCL has been shown many times [1,2]. However, the activation of these transitions is achieved at diff erent bias points, which corresponds to the optimal alignment of energy levels for each transition. We propose to add an additional step to the ladder of energy levels in the gain module, equal to the energy of THz photon. Due to the low energy of THz photon, it becomes possible to design the gain module based on the conventional GaAs/Al0.15Ga0.85As heterojunction with two-photon emission at one bias point.
- ПубликацияОткрытый доступTHZ RADIATION BY FREE ELECTRONS FROM 2D PHOTONIC CRYSTALS AND METASURFACES(НИЯУ МИФИ, 2023) Tishchenko, A. A.; Sergeeva, D. Yu.; Garaev, D. I.; Гараев, Дамир Ильдарович; Сергеева, Дарья Юрьевна; Тищенко, Алексей АлександровичTerahertz radiation sources based on the radiation of electrons in external fi elds attracts the attention of researches due to the huge energy stored in relativistic electron beams. Even a little part of this energy, being radiated, makes it possible to produce powerful radiation in various parts of spectrum, including terahertz one, which is exploited in gyrotrons, magnetrons, orotrons etc. Besides its customary applications in powerful radiation sources and in non-destructive diagnostics of relativistic electron beams, the last decade SPR is intensively investigated for more exotic structures, like plasmonic crystals [1-3], graphene nanoscale gratings [4, 5], metasurfaces [6, 7]. These novel structures are widely investigated today due to their tunability, opportunity to tailor the properties of the surfaces, which results in developing novel modulators [8] and fi lters [9] — the key elements in applications of modern optics.