Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Boris Knyazev"'
Publikováno v:
Light: Advanced Manufacturing, Vol 3, Pp 1-17 (2022)
This paper presents the results of 15 years of studies in the field of terahertz holography at the Novosibirsk free electron laser. They cover two areas: research on obtaining holographic images in the terahertz range and the use of diffractive optic
Externí odkaz:
https://doaj.org/article/6257d37ab93c4bd798c21dfca8834a2c
Autor:
Boris Knyazev, Natalya Osintseva, Maxim Komlenok, Vladimir Pavelyev, Vasily Gerasimov, Oleg Kameshkov, Yulia Choporova, Konstantin Tukmakov
Publikováno v:
Photonics, Vol 10, Iss 6, p 700 (2023)
The characteristics of high-power vortex Bessel beams in the terahertz range (λ=141 μm) obtained with the use of diffractive axicons (DAs) illuminated by a Gaussian beam of the Novosibirsk free-electron laser were studied. Two of the three possible
Externí odkaz:
https://doaj.org/article/e3b2770663f146f98489aaf8b68484e6
Autor:
Vladimir Pavelyev, Svetlana Khonina, Sergey Degtyarev, Konstantin Tukmakov, Anton Reshetnikov, Vasily Gerasimov, Natalya Osintseva, Boris Knyazev
Publikováno v:
Sensors, Vol 23, Iss 3, p 1579 (2023)
Coherent terahertz beams with radial polarization of the 1st, 2nd, and 3rd orders have been generated with the use of silicon subwavelength diffractive optical elements (DOEs). Silicon elements were fabricated by a technology similar to the technolog
Externí odkaz:
https://doaj.org/article/2e1e696c59124ad09fc4549791a832ed
Publikováno v:
Компьютерная оптика, Vol 43, Iss 6, Pp 992-1000 (2019)
Three optical systems employing diffractive optical elements to generate surface plasmon polaritons (SPP) with orbital angular momentum on axisymmetric conductors are considered. In all three systems, the incident radiation is first converted by bina
Externí odkaz:
https://doaj.org/article/9f3e345772b3434597498feac1be503f
Publikováno v:
Компьютерная оптика, Vol 43, Iss 6, Pp 1103-1108 (2019)
The paper is devoted to investigation of forming multimode coherent beams of terahertz radiation with pre-given transverse mode content and terahertz vector beams by use of silicon diffractive optical elements forming single modes from terahertz free
Externí odkaz:
https://doaj.org/article/2b7046efa4b84039943316c101c362c3
Autor:
Svetlana Khonina, Konstantin Tukmakov, Sergey Degtyarev, Anton Reshetnikov, Vladimir Pavelyev, Boris Knyazev, Yulia Choporova
Publikováno v:
Компьютерная оптика, Vol 43, Iss 5, Pp 756-764 (2019)
A silicon subwavelengh terahertz axicon has been designed, fabricated, and investigated by methods of numerical and optical experiments. The research has been performed on a free-electron laser workstation NOVOFEL (Budker Institute of Nuclear Physics
Externí odkaz:
https://doaj.org/article/a01d6eceaee74f8a9c2bf975b2f09367
Publikováno v:
PLoS ONE, Vol 16, Iss 3, p e0247936 (2021)
Reasoning about graphs evolving over time is a challenging concept in many domains, such as bioinformatics, physics, and social networks. We consider a common case in which edges can be short term interactions (e.g., messaging) or long term structura
Externí odkaz:
https://doaj.org/article/06fca3f25a164b7fbd74ca2b5aef53d8
Autor:
Jianzhu Guo, Zhen Lei, Jun Wan, Egils Avots, Noushin Hajarolasvadi, Boris Knyazev, Artem Kuharenko, Julio C. Silveira Jacques Junior, Xavier Baro, Hasan Demirel, Sergio Escalera, Juri Allik, Gholamreza Anbarjafari
Publikováno v:
IEEE Access, Vol 6, Pp 26391-26403 (2018)
Emotion recognition has a key role in affective computing. Recently, fine-grained emotion analysis, such as compound facial expression of emotions, has attracted high interest of researchers working on affective computing. A compound facial emotion i
Externí odkaz:
https://doaj.org/article/5956debd1d9c462b8348b5e8b865190b
Publikováno v:
Sensors, Vol 22, Iss 1, p 172 (2021)
Terahertz surface plasmon resonance (SPR) sensors have been regarded as a promising technology in biomedicine due to their real-time, label-free, and ultrasensitive monitoring features. Different authors have suggested a lot of SPR sensors, including
Externí odkaz:
https://doaj.org/article/2277005b0c21459b94a502fdc3ecc97b
Publikováno v:
Applied Sciences, Vol 11, Iss 2, p 717 (2021)
Transformation of a Bessel beam by a lens results in the formation of a “perfect” vortex beam (PVB) in the focal plane of the lens. The PVB has a single-ring cross-section and carries an orbital angular momentum (OAM) equal to the OAM of the “p
Externí odkaz:
https://doaj.org/article/1f9b464fa9b34365abc63d5cdc5b52e6