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Wyszukujesz frazę "THz" wg kryterium: Temat


Tytuł:
Response of Indium Antimonide at Sub-Terahertz and Terahertz Frequencies
Autorzy:
Yavorskiy, D.
Karpierz, K.
Grynberg, M.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033781.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
THz spectroscopy
InSb THz detector
Opis:
Responsivity of a bulk InSb detector at liquid helium temperature was studied in the frequency range 0.1 THz
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 338-339
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compact terahertz devices based on silicon in CMOS and BiCMOS technologies
Autorzy:
But, Dmytro B.
Chernyadiev, Alexander V.
Ikamas, Kęstutis
Kołaciński, Cezary
Krysl, Anastasiya
Roskos, Hartmut G.
Knap, Wojciech
Lisauskas, Alvydas
Powiązania:
https://bibliotekanauki.pl/articles/2204176.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
terahertz
teraFET
CMOS
THz emitter
THz detectors
Opis:
This paper reports on compact CMOS-based electronic sources and detectors developed for the terahertz frequency range. It was demonstrated that with the achievable noise-equivalent power levels in a few tens of pW/√Hz and the emitted power in the range of 100 μW, one can build effective quasi-optical emitter-detector pairs operating in the 200–266 GHz range with the input power-related signal-to-noise ratio reaching 70 dB for 1 Hz-equivalent noise bandwidth. The applicability of these compact devices for a variety of applications including imaging, spectroscopy or wireless communication links was also demonstrated.
Źródło:
Opto-Electronics Review; 2023, 31, 2; art. no. e144599
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital communication : optical vs. THz links
Autorzy:
Marczewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1818239.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
mobile communication
optical links
Shannon theorem
THz radiation
THz links
Opis:
The paper presents a comprehensive look at the perspectives on the use of THz in digital communication systems. The publication aims to focus on arguments that justify a significant increase in the frequency of radio links and their integration with fibre-based networks. Comparison of THz links with their microwave and optical counterparts is discussed from basic physical limitations to technological constraints. Main attention is paid to the available channel capacity resulting from its bandwidth and signal-to-noise ratio. The short final discussion is about technology platforms that seem to be crucial to the availability of suitable THz sources. According to the author, the biggest advantage of using bands in the range of several hundred GHz for a digital data transmission is their use for mobile communication over short distances, as well as for broadband indoor links. However, these applications require a development of compact electronic THz sources with low noise and power reaching single watts. This is beyond the range of the most popular silicon-based technology platform, although a significant progress can be expected with the development of technologies based on wide bandgap semiconductors. Fibre optic connections remain the unquestioned leader in communication over long distances and permanent links.
Źródło:
Opto-Electronics Review; 2020, 28, 3; 176--181
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital communication : optical vs. THz links
Autorzy:
Marczewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1818244.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
mobile communication
optical links
Shannon theorem
THz radiation
THz links
Opis:
The paper presents a comprehensive look at the perspectives on the use of THz in digital communication systems. The publication aims to focus on arguments that justify a significant increase in the frequency of radio links and their integration with fibre-based networks. Comparison of THz links with their microwave and optical counterparts is discussed from basic physical limitations to technological constraints. Main attention is paid to the available channel capacity resulting from its bandwidth and signal-to-noise ratio. The short final discussion is about technology platforms that seem to be crucial to the availability of suitable THz sources. According to the author, the biggest advantage of using bands in the range of several hundred GHz for a digital data transmission is their use for mobile communication over short distances, as well as for broadband indoor links. However, these applications require a development of compact electronic THz sources with low noise and power reaching single watts. This is beyond the range of the most popular silicon-based technology platform, although a significant progress can be expected with the development of technologies based on wide bandgap semiconductors. Fibre optic connections remain the unquestioned leader in communication over long distances and permanent links.
Źródło:
Opto-Electronics Review; 2020, 28, 3; 176--181
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Metallic Pattern for Enhancement of a THz Field in a Two-Dimensional Electron Plasma
Autorzy:
Tarkowski, T.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033104.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Metamaterials
THz field enhancement
Opis:
A metamaterial in the form of a periodic lattice of split-ring resonators on a GaAs/AlGaAs heterostructure was numerically studied at terahertz frequencies. A finite-difference time-domain algorithm was applied to calculate distribution of the electromagnetic field in the layer positioned at 100 nm below the heterostructure surface where a two-dimensional electron gas typically resides in real structures. The results allowed to determine the resonant frequencies of the metamaterial as well as an enhancement factor of the electric field as a function of the period of the metamaterial's lattice.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 332-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości i zastosowania nematycznych ciekłych kryształów w technologii terahercowej
Properties and Applications of Nematic Liquid Crystals in THz Technology
Autorzy:
Chodorow, U.
Parka, J.
Powiązania:
https://bibliotekanauki.pl/articles/210809.pdf
Data publikacji:
2013
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
technologia terahercowa
ciekłe kryształy
promieniowanie THz
terahertz technology
liquid crystals
THz radiation
Opis:
Prace nad technologią terahercową (THz) prowadzone są już od przeszło trzech dekad, podczas gdy badania nad wykorzystaniem ciekłych kryształów (CK) w zakresie THz trwają dopiero od dekady. W artykule przedstawione zostały wyniki pomiarów spektralnych CK w obszarze Thz. Opisano wybrane właściwości komercyjnie dostępnego związku CK o symbolu 5CB oraz dwóch mieszanin CK o nazwach 1832B i 1825. Korzystając z dostępnej literatury, zostało wybranych i omówionych kilka urządzeń modulujących promieniowanie THz, w których jako elementy przestrajalne wykorzystane zostały ciekłe kryształy.
Works on terahertz (THz) technology have been conducted for over three decades while research on the use of liquid crystals in the THz range lasted only a decade. In the paper, the results of spectral measurements of LC in the THz range are presented. Selected properties of a commercially available LC compound with the symbol 5CB and two LC mixtures called 1832B and 1825 are described. Using available literature, several devices, which modulate the THz radiation, were selected and discussed. In these devices, liquid crystals were used as tunable elements.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 1; 13-30
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sub-Terahertz Emission from Field-Effect Transistors
Autorzy:
Yavorskiy, D.
Karpierz, K.
Kopyt, P.
Grynberg, M.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033125.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Field-effect transistors
THz emission
Opis:
Several commercially available field-effect GaInAs-based transistors were studied as emitters of electromagnetic radiation. The emitters were tested either at room or at liquid helium temperature. To spectrally analyse emitted radiation, we applied three different experimental techniques: a spectrum analyser with antennas and mixers, a Michelson interferometer and a magnetic-field-tunable InSb detector. We show that the emission consists of a fundamental frequency of 11.5 GHz and its multiple harmonics spanning the emission band up to about 400 GHz. Analysis of the results allows us to suggest that the emission is caused by a Gunn effect and a high harmonics content is related to a pulse-like time dependence of the current.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 335-337
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and analysis of a graphene-based Tera-Hertz antenna with lower complexities
Autorzy:
Islam, Md. Mashrur
Ahmed, Saleh
Mahmud, Nadim
Powiązania:
https://bibliotekanauki.pl/articles/1075613.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Graphene
PEC
THz
brain imaging
Opis:
A graphene based rectangular patch antenna is designed at .979 THz with a return loss of -20 & VSWR of 2.1. A comparison of patch between graphene & its counterparts is investigated & found the superiority of graphene over PEC & Copper. This type of patch antenna can be used for future THz brain imaging.
Źródło:
World Scientific News; 2019, 125; 18-31
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THz spectroscopy of explosive-related simulants and oxidizers
Autorzy:
Trzciński, T.
Palka, N.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200109.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
THz spectroscopy
explosive-related simulants
Opis:
In this paper we report on measurement of spectra of commonly applied explosives, some materials which can be used for manufacture of explosive and THz simulants of explosives in transmission mode. Substances were prepared as pellets, and the measurements were performed using the Time Domain Spectroscopy system in the range 0.1–3.0 THz.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 445-447
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All fiber THz spectrometer for plastics industry
Autorzy:
Wilk, R.
Powiązania:
https://bibliotekanauki.pl/articles/200188.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fiber THz spectrometer
plastic industry
Opis:
In this paper we present an all-fiber THz spectrometer based on novel OSCAT technique. We investigate its application to non-destructive testing in the polymer industry. A set of polypropylene samples with different contents of TiO2 as a filler is examined using THz waves.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 283-285
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavefunction-engineering of intersubband THz-laser nanoheterointerfaces
Autorzy:
Anagnostakis, E.
Powiązania:
https://bibliotekanauki.pl/articles/1934034.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska
Tematy:
optoelectronic nanodevices
nanophotonics
THz-laser nanoheterointerfaces
Opis:
A novel THz-luminescence laser nanoheterointerfacial scheme of the intersubband, longer-wavelength limit, mid-infrared functionality type has been designed on the basis of optically-pumped dual-resonant tunnelling of conductivity electrons within an appropriately energetically-determined configuration of five subbands hosted by two communicating asymmetric, approximately rectangular quantum wells (QWs). The employed upper laser-action level is the second excited subband of the nanostructure back, wider QW and is provided with electrons via resonant tunnelling from the first excited subband of the nanostructure front QW populated through remotely ignited optical pumping out of the local fundamental subband. On the other hand, the first excited back-QW subband functions as the lower laser action level, directly delivering the received electrons to the local fundamental subband via a fast vertical longitudinal optical phonon scattering. From there, they are recycled back to the nanostructure front QW fundamental subband by virtue of a second, reverse sense resonant-tunnelling-mediated normal charge transport mechanism. A nanophotonics application of the scheme predicts laser operability in the 15-THz range.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 1; 85-90
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz photomixer
Autorzy:
Pliński, E.
Powiązania:
https://bibliotekanauki.pl/articles/200658.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous wave optical devices
THz photomixers
terahertz radiation
Opis:
The paper gives a review of continuous wave optical devices called THz photomixers used for excitation and detection of the terahertz radiation. Possible structures of the terahertz photomixers are classified and described.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 463-470
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja filtra interferencyjnego dla zakresu terahercowego
Simulation of interference terahertz filter
Autorzy:
Marciniak, P.
Walczak, A.
Moszczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/403975.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
filtr Fabry’ego-Perota
filtr terahercowy
Fabry-Perot filter
THz band pass filter
Opis:
W artykule zaprezentowano model do wyznaczania i modyfikacji parametrów filtra interferencyjnego w układzie Fabry’ego-Perota wypełnionego ośrodkiem o pomijalnej dyspersji dla zakresu terahercowego. W modelu uwzględniona została jedynie dyspersja materiału ścianek filtra. Model - umożliwia wyznaczenie szerokości wnęki filtra oraz znalezienie profilu współczynnika odbicia ścianek filtra (zwierciadeł), który najlepiej dopasowuje profil transmitancji teoretycznej do profilu transmitancji rzeczywistej.
In this article we present model of Fabry-Perot filter for calculation and modification selected parameters like transmittance, cavity width and profile of the coefficient of reflection. This model includes information about dispersive coefficient of reflection of filter plates. Application allows us to observe change of transmittance in dependency on filter construction as well as phase of reflection.
Źródło:
Symulacja w Badaniach i Rozwoju; 2015, 6, 2; 105-113
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide
Autorzy:
Ali, S.
Ahmed, N.
Alwee, S.
Islam, M.
Rana, S.
Bhuiyan, T.
Powiązania:
https://bibliotekanauki.pl/articles/227154.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous core waveguide
THz waveguide
flat EML
hybrid design
flat dispersion
triangular design
core rotation
Opis:
In this paper, we investigate the effects for rotating the triangular core air hole arrangements of a hybrid design porous core fiber. The triangular core has been rotated in anticlockwise direction to evaluate the impact on different waveguide properties. Effective Material Loss (EML), confinement loss, bending loss, dispersion characteristics and fraction of power flow are calculated to determine the impacts for rotating the triangular core. The porous fiber represented here has a hybrid design in the core area which includes circular rings with central triangular air hole arrangement. The cladding of the investigated fiber has a hexagonal array of air hole distribution. For optimum parameters the reported hybrid porous core fiber shows a flat EML of ±0.000416 cm⁻¹ from 1.5 to 5 terahertz (THz) range and a near zero dispersion of 0.4±0.042 ps/THz/cm from 1.25 to 5.0 THz. Negligible confinement and bending losses are reported for this new type of hybrid porous core design. With improved concept of air hole distribution and exceptional waveguide properties, the reported porous core fiber can be considered as a vital forwarding step in this field of research.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 25-31
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LTCC glass-ceramics based on diopside/cordierite/Al2O3 for ultra-high frequency applications
Autorzy:
Synkiewicz-Musialska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/35138346.pdf
Data publikacji:
2023
Wydawca:
Radomskie Towarzystwo Naukowe
Tematy:
glass-ceramics
diopside
cordierite
Al2O3
LTCC technology
THz dielectric properties
tworzywo szklano-ceramiczne
diopsyd
kordieryt
technologia LTCC
właściwości dielektryczne
Opis:
In this work, three glass-ceramic composites based on a commercial SiO2-B2O3-Al2O3-CaO-MgO glass and cordierite, diopside or Al2O3 were used for preparation of green tapes and low temperature cofired ceramics (LTCC) substrates. The thermal behavior, phase composition, microstructure and dielectric properties of the fabricated glass-ceramics were characterized using a heating microscope, thermal analysis, X-ray diffraction, scanning electron microscopy and time domain spectroscopy. The applicability of the developed materials for LTCC technology was demonstrated by the preparation of test multilayer substrates. The glass-ceramic substrates exhibit advantageous properties for ultra-high frequency LTCC applications, including low sintering temperatures of 900-980°C, good compatibility with commercial Ag and AgPd conductive pastes and a low dielectric permittivity of 3.5-7 at 1 THz.
Źródło:
Scientiae Radices; 2023, 2, 2; 190-201
2956-4808
Pojawia się w:
Scientiae Radices
Dostawca treści:
Biblioteka Nauki
Artykuł

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