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    Wyświetlanie 1-13 z 13
    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:
    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:
    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
      Wyświetlanie 1-13 z 13

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