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Author |
Каурова, Н. С.; Финкель, М. И.; Масленников, С. Н.; Вахтомин, Ю. Б.; Антипов, С. В.; Смирнов, К. В.; Воронов, Б. М.; Гольцман, Г. Н.; Ильин, К. С. |
Title |
Смеситель субмиллиметрового диапазона длин волн на основе тонкой пленки YBa2Cu3O7-x |
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Conference Article |
Year |
2004 |
Publication |
1-я международная конференция Фундаментальные проблемы высокотемпературной сверхпроводимости |
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291 |
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Москва-Звенигород |
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Москва-Звенигород |
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russian |
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RPLAB @ s @ htsmix_zvenigorod_2004_rus |
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356 |
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Author |
Yu, B; Zeng, F; Yang, Y; Xing, Q; Chechin, A; Xin, X; Zeylikovich, I; Alfano R. R. |
Title |
Torsional vibrational modes of tryptophan studied by terahertz time-domain spectroscopy |
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Journal Article |
Year |
2004 |
Publication |
Biophys. J. |
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Volume |
86 |
Issue |
3 |
Pages |
1649-1654 |
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THz applications |
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491 |
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Author |
Koshelets, V. P. |
Title |
Integrated superconducting submm receivers |
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Miscellaneous |
Year |
2004 |
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SIR |
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511 |
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Title |
Statue of the SIR program for SR&T (extension to 1 THz) |
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Miscellaneous |
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2004 |
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512 |
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Koshelets, V. P.; Shitov, S. V.; Dmitriev, P. N., Ermakov, A. B.; Filippenko, L. V.; Koryukin, O.V.; Sobolev, A.S.; Torgashin, M.Yu.; Yagoubov, P.; Hoogeveen, R. |
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Integrated submillimeter and terahertz receivers with superconducting local oscillator |
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2004 |
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Presanted at 8th International Workshop “From Andreev Reflection to the International Space Station” |
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513 |
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Koshelets, V. P.; Dmitriev, P. N.; Ermakov, A. B.; Filippenko, L. V.; Khudchenko, A. V.; Koryukin, O. V.; Torgashin, M. Yu.; Hoogeveen, R.; Vreeling, W. J.; Yagoubov, P. |
Title |
SIR for TELIS (post-critical) review |
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Miscellaneous |
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2004 |
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516 |
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van't Klooster, K.; Myasnikova, S. E.; Parshin, V. V.; Kasparek, W. |
Title |
Results of reflection loss measurements of sample material for radio astronomy telescope antenna for Planck Project |
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Conference Article |
Year |
2004 |
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Proc. 14th international crimean conference on microwave and telecommunication technology |
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753-755 |
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mirror, reflection index, emissivity, Fabry-Perot interferometer, space observatory, terahertz, THz |
Abstract |
Advanced radio telescope antennas for space applications are realised by the use of stable composite materials, which are lighter in general than various metal realisations. Reflectivity measurements have been carried out on high technology samples for the Planck radio telescope. Highly accurate results have been obtained at the Applied Physics Institute in Nizhny Novgorod, and an independent measurement with a totally different setup at the University of Stuttgart confirmed that one of the samples showed a strange behaviour. Moreover, it confirmed the high accuracy of the testing method. |
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579 |
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González, Francisco Javier; Alda, Javier; Ilic, Bojan; Boreman, Glenn D. |
Title |
Infrared Antennas Coupled to Lithographic Fresnel Zone Plate Lenses |
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Journal Article |
Year |
2004 |
Publication |
Applied Optics |
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Appl. Opt. |
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43 |
Issue |
33 |
Pages |
6067-6073 |
Keywords |
optical antennas |
Abstract |
Several designs for Fresnel zone plate lenses (FZPLs) to be used in conjunction with antenna-coupled infrared detectors have been fabricated and tested. The designs comprise square and circular FZPLs with different numbers of Fresnel zones working in transmissive or reflective modes designed to focus infrared energy on a square-spiral antenna connected to a microbolometer. A 163× maximum increase in response was obtained from a 15-zone circular FZPL in the transmissive mode. Sensor measurements of normalized detectivity D* resulted in a 2.67× increase with FZPLs compared with measurements made of square-spiral antennas without FZPLs. The experimental results are discussed and compared with values obtained from theoretical calculations. |
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RPLAB @ gujma @ |
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740 |
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Kramer, B.; Chen, C-C.; Volakis, J.D. |
Title |
The development of a mini-UWB antenna |
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Journal Article |
Year |
2004 |
Publication |
Measurement and Techniques Association Symposium |
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AMTA |
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6 |
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optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
Abstract |
There is a great interest in the automotive and military sectors for small and broadband antennas that meet modern communication needs. These needs require ultra-wide bandwidth (>10:1) UWB antennas, such as the spiral antenna. However, the physical size at the low-frequency end typically becomes too large for practical applications. To reduce the size of the antenna, miniaturization techniques must be employed such as the use of high-contrast dielectric materials. Size reduction using high-contrast materials has been demonstrated for narrowband antennas, such as patch antennas, but not for broadband antennas to our knowledge. Therefore, the concept of miniaturizing a broadband spiral antenna using dielectric materials will be investigated experimentally and numerically.Issues that arise from dielectric loading such as impedance reduction will also be addressed. It will be shown using the results from these studies that there are practical limitations to the amount of miniaturization which can be achieved. |
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RPLAB @ gujma @ |
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751 |
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Genack, Azriel Z.; Kopp, Victor I.; Churikov, Victor M.; Singer, Jonathan; Chao, Norman; Neugroschl, Daniel A. |
Title |
Chiral fiber Bragg gratings |
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Conference Article |
Year |
2004 |
Publication |
Proceedings of the SPIE |
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Proc. SPIE |
Volume |
5508 |
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57-64 |
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optical fiber gratings, chiral fiber gratings, chiral gratings, from chiralphotonics |
Abstract |
We have produced chiral fiber Bragg gratings with double-helix symmetry and measured the polarization and wavelength selective transmission properties of these structures. These gratings interact only with circularly polarized light with the same handedness as the grating twist and freely transmit light of the orthogonal polarization. The optical characteristics of chiral fibers are compared to those of planar cholesteric structures. The resonant standing wave at the band edge or at a defect state within the band gap, as well as the evanescent wave within the band gap is comprised of two counterpropagating components of equal amplitude. The electric field vector of such a circularly polarized standing wave does not rotate in time; rather it is linearly polarized in any given plane. The standing wave may be described in terms of the sense of circular polarization of the two counterpropagating components. The wavelength dependence of the angle q between the linearly polarized electromagnetic field and the extraordinary axis, which is constant throughout a long structure, is obtained in a simple calculation. The results are in good agreement with scattering matrix calculations. Resonant chiral gratings are demonstrated for microwave radiation whereas chiral gratings with pitch exceeding the wavelength are demonstrated at optical wavelengths in single-mode glass fibers. The different functionalities of these fibers are discussed. |
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854 |
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