Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
We report on our terahertz study of the reduction effect on graphene oxide films grown on fused silica substrates by spin-coating. The optical characteristics before and after thermal reduction were studied by terahertz time-domain spectroscopy.
A VOx microbolometer detector coupled with thin-film spiral antenna was fabricated by metal-organic decomposition. Temperature coefficient of resistance of the microbolometer was 4.7 %/K at 300 K and the responsivity was 120 V/W for 94 GHz electromagnetic wave radiation at a bias current of 0.5 mA.
Conversion from static electric fields to periodic terahertz waves has been experimentally demonstrated at 0.38THz using an optically controlled array of coplanar strip lines on a semi-insulator GaAs substrate.
The paper describes the method of modelling a microstrip transmission line fabricated on FR-4 substrate in the GHz frequency range. The model is based on the real part of high frequency complex electric permittivity of the dielectric measured with THz time domain spectrometer. The microstrip measurement results are used to analyse the model accuracy.
We propose a new concept of THz radiation detector composed of a micro-scale THz antenna coupled to a silicon-based quantum dot. The antenna concentrates the incident THz radiation towards the quantum dot, allowing us to measure the current shift induced on the quantum dot Coulomb Oscillations.
In this paper we will discuss ZnO nanotube formation by chemical wet etching of ZnO nanorod. Photoluminescence measurements and Terahertz time-domain spectroscopy (THz-TDS) [1] are conducted to study its variation of optical properties. The mechanism of nanotube formation is characterized and optical properties are compared between nanorods and nanotubes.
VOx thin films were fabricated on fused quartz substrates by metal-organic decomposition. In R-T characteristics, VOx films indicated an abrupt phase transition around 52°C with a resistivity change of 3–4 orders and temperature coefficient of resistance of 4.4–4.8 %/K at 300 K.
We develop a mode-locked Yb-doped fiber laser system and obtain ultra-short pulses, toward high-intensity THz frequency comb generation. By using these pulses, we attempt to generate THz pulse from an InAs substrate and confirm it. By improving our system, higher intensity THz frequency comb generation is expected.
Test chips with Si MOSFETs integrating bow tie antennas are investigated to check the polarization and frequency dependence of THz sensitivity. The azimuthal angle corresponding to the maximum sensitivity changes with the pixel position on the chip. This means that the surrounding pixels affect the bow tie radiation pattern and possibly contribute to the antenna coupling. The frequency dependence...
We carried out terahertz-time domain spectroscopy of a chemical vapor deposition (CVD) diamond substrate and derived its complex permittivity from 0.3 to 2.2 THz. The permittivity in this region shows broad band features. It is suggested that some other dielectric response is present above 2.2 THz in the CVD diamond.
We present two designs of planar terahertz metamaterials for strain sensing. A series of resonance frequency shifts are obtained with differing gap widths when the sensor is under mechanical compression. The subwavelength metamaterial structures exhibit a high-Q resonance resulting in a good sensitivity to mechanical deformation. Because of the penetrability and relatively high spatial resolution...
We present a metamaterial-based sensor for use at terahertz (THz) frequencies that is suitable for the measurement of the thickness and the refractive index of a dielectric sample material. The sensor is designed to operate in reflection geometry in the frequency range between 1 THz and 1.6 THz. Deep-subwavelength sample thicknesses as small as 1/16000 of the operating wavelength can be resolved as...
Far-infrared instrumentation is depending on effective filters for wavelength band definition and suppression of unwanted signals. We present an approach to design and manufacture filters both for cryogenic and room temperature applications using a unified technology.
We propose and demonstrate a graphene-based device achieving extraordinary control of terahertz (THz) wave reflectance. The advantages of graphene based switchable THz devices include low cost, facile fabrication and excellent tunability, thus promising for THz system applications.
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.