2023_5-я Конференция с международным участием «Терагерцевое и микроволновое излучение: генерация, детектирование и приложения» (ТЕРА-2023)
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- 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 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 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 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 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.
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