Conveners
THz radiation aplication: Plenary 3
- Boris Knyazev ()
- Vitaly Kubarev ()
THz radiation aplication: Oral 2
- Boris Knyazev ()
- Vitaly Kubarev ()
A review is given of the experiments in the field of photonics and plasmonics, recently performed on the Novosibirsk free electron laser (NovoFEL). The parameters of NovoFEL radiation and user workstations are described. Considerable attention is paid to the development and testing of quasi-optical elements designed for this range and to methods for the formation of powerful beams of terahertz...
The present talk is devoted to the use of beams with orbital angular momentum (OAM) [1] for development THz multichannel systems based on the mode division multiplexing (MDM) approach. The work [2] shows the results of the feasibility study of organizing a multichannel terahertz (THz) communication system based on controlling the transverse-mode composition of a coherent beam of terahertz...
We present results of our research on generation of THz radiation in liquid nitrogen. We used a dual-frequency scheme when emissions of the main laser frequency and its second harmonic are mixed in the same medium. The research showed a possibility of effective conversion of optical radiation into THz radiation.
This work is partially supported by RFBR grant №18-29-20104.
This presentation reviews some recent experiments using free-electron-laser-based narrow-band as well as tabletop-laser-based single-cycle terahertz (THz) fields for exploring electronic properties in semiconducting GaAs/InGaAs core/shell nanowires (NW) [1]. In undoped NW, charge carriers are optically excited by near-infrared pulses and probed by strong single-cycle THz fields up to 0.6...
In this study we performed a differential proteomic analysis of the total E.coli soluble protein fraction after exposure to THz radiation. Glutamine synthase was one of the proteins overexpressed in response to THz radiation. We constructed the E.coli/pGlnA-GFP biosensor based on the promoter of the glnA gene and the GFP protein and demonstrated that it could detect THz radiation.
This work describes the prospects of the point-like discharge supported by focused terahertz NovoFEL radiation as a source of UV and VUV light. This work is partially supported by RFBR grant офи-м № 14-22-02070.
In this work we present the current status of CW and TR EPR station at NovoFEL [1]. The detailed layout of the experimental user station is shown and discussed. While the CW and TR EPR X-band (9 GHz) spectrometer used is almost the same as in many EPR laboratories, it was built in the NovoFEL beamline and allows performing the unique EPR experiments with simultaneous irradiation of the sample...
The report presents the results of research to assess the possibility of creating a terahertz (THz) Fourier spectrometer, the information carrier in which is surface plasmon-polaritons (SPPs) generated by a broadband radiation source. The key node of the spectrometer is the Michelson surface plasmon interferometer, which uses flat mirrors and plates for reflection and splitting SPP beams. The...
The results of pump-probe experiments devoted to investigation of relaxation of bound electrons in elemental semiconductors will be presented. The radiation of free electron lasers was used to excite the donor and measure the relaxation times. Several donors were investigated to uunderstand the common features as well as difference originated from different chemical nature of particular donor....
Abstract
Effect of external longitudinal magnetic field on the optical Free Induction Decay from a free radical is observed for the first time. The experiments were performed on a rotational transition of hydroxyl radical, OH (23/2(J=1) 23/2(J=0) at 83.8 cm−1) using Terahertz Free Electron Laser. In contrast to the results of the experiments with a stable paramagnetic molecule, NO, the...
An increase in the radiation power of THz sources creates the need for the development of new optics operating with it. Here, we propose and realize the fabrication of silicon and diamond diffractive lenses with a continuous profile by the method of direct and indirect laser ablation, respectively. The fabricated lenses were tested with a free-electron laser at the wavelength of 141 µm and...
Surface plasmon resonance (SPR) microscopy is one of the most sensitive label-free microscopy method, however, it has a low lateral resolution. This drawback is primarily caused by the fact that surface plasmon polaritons (SPPs) excited by terahertz (THz) radiation propagate from their excitation spot to macro distances (about ~100 λ), thereby blurring the observed region by analogy with a...
One of the leading areas in telecommunication technology is the development of high-speed devices. At present, the use of the acousto-optical (AO) effect to control radiation is promising. Devices based on this effect are used in the ultraviolet, visible and infrared ranges. One of the main problems of using the AO effect in the terahertz (THz) range is the low diffraction efficiency (four...
