Generation of tunable THz radiation by femtosecond tilted-pulse-front excitation

2002 ◽  
Author(s):  
János Hebling ◽  
Gábor Almási ◽  
Ida Z. Kozma ◽  
Jürgen Kuhl
Keyword(s):  
Thz Radiation ◽  
Pulse Front

Generation of tunable THz radiation by femtosecond tilted-pulse-front excitation

2003 ◽  
pp. 268-270
Author(s):  
János Hebling ◽  
Gábor Almási ◽  
Ida Z. Kozma ◽  
Jürgen Kuhl
Keyword(s):  
Thz Radiation ◽  
Pulse Front

Analysis on THz Radiation Generation Efficiency in Optical Rectification by Tilted-Pulse-Front Pumping

2015 ◽  
Vol 36 (9) ◽  
pp. 866-875
Author(s):  
Qinglong Meng ◽  
Rong Ye ◽  
Zheqiang Zhong ◽  
Junli Yu ◽  
Bin Zhang
Keyword(s):  
Optical Rectification ◽  
Thz Radiation ◽  
Generation Efficiency ◽  
Pulse Front ◽  
Radiation Generation

Generation and modeling of tunable THz radiation by femtosecond tilted-pulse-front excitation

2003 ◽  
Author(s):  
Gabor Almasi ◽  
Janos Hebling ◽  
Ida Z. Kozma ◽  
Juergen Kuhl
Keyword(s):  
Thz Radiation ◽  
Pulse Front

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

scholarly journals Terahertz Photoconductivity Spectra of Electrodeposited Thin Bi Films

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3150
Author(s):  
Ignas Nevinskas ◽  
Zenius Mockus ◽  
Remigijus Juškėnas ◽  
Ričardas Norkus ◽  
Algirdas Selskis ◽  
...  
Keyword(s):  
Spatial Separation ◽  
Thz Radiation ◽  
Electron Dynamics ◽  
Optical Pulses ◽  
Electrolyte Additive ◽  
Spectra Analysis ◽  
Grain Sizes ◽  
Carrier Scattering ◽  
Bismuth Films ◽  
Triton X

Electron dynamics in the polycrystalline bismuth films were investigated by measuring emitted terahertz (THz) radiation pulses after their photoexcitation by tunable wavelength femtosecond duration optical pulses. Bi films were grown on metallic Au, Pt, and Ag substrates by the electrodeposition method with the Triton X-100 electrolyte additive, which allowed us to obtain more uniform films with consistent grain sizes on any substrate. It was shown that THz pulses are generated due to the spatial separation of photoexcited electrons and holes diffusing from the illuminated surface at different rates. The THz photoconductivity spectra analysis has led to a conclusion that the thermalization of more mobile carriers (electrons) is dominated by the carrier–carrier scattering rather than by their interaction with the lattice.

scholarly journals Photothermal, Photoelectric, and Photothermoelectric Effects in Bi-Sb Thin Films in the Terahertz Frequency Range at Room Temperature

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 76
Author(s):  
Mikhail K. Khodzitsky ◽  
Petr S. Demchenko ◽  
Dmitry V. Zykov ◽  
Anton D. Zaitsev ◽  
Elena S. Makarova ◽  
...  
Keyword(s):  
Thin Films ◽  
Terahertz Radiation ◽  
Room Temperature ◽  
Voltage Drop ◽  
Radiation Detection ◽  
Radiation Detectors ◽  
Thz Radiation ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range

The terahertz frequency range is promising for solving various practically important problems. However, for the terahertz technology development, there is still a problem with the lack of affordable and effective terahertz devices. One of the main tasks is to search for new materials with high sensitivity to terahertz radiation at room temperature. Bi1−xSbx thin films with various Sb concentrations seem to be suitable for such conditions. In this paper, the terahertz radiation influence onto the properties of thermoelectric Bi1−xSbx 200 nm films was investigated for the first time. The films were obtained by means of thermal evaporation in vacuum. They were affected by terahertz radiation at the frequency of 0.14 terahertz (THz) in the presence of thermal gradient, electric field or without these influences. The temporal dependencies of photoconductivity, temperature difference and voltage drop were measured. The obtained data demonstrate the possibility for practical use of Bi1−xSbx thin films for THz radiation detection. The results of our work promote the usage of these thermoelectric materials, as well as THz radiation detectors based on them, in various areas of modern THz photonics.

Generation of the THz radiation in Mo0.5W0.5S2 solid solution

2021 ◽  
Author(s):  
A. V. Gorbatova ◽  
D. I. Khusyainov ◽  
A. M. Buryakov
Keyword(s):  
Solid Solution ◽  
Thz Radiation

Generation of high-power terahertz pulses by tilted-pulse-front excitation and their application possibilities

2008 ◽  
Vol 25 (7) ◽  
pp. B6 ◽  
Author(s):  
János Hebling ◽  
Ka-Lo Yeh ◽  
Matthias C. Hoffmann ◽  
Balázs Bartal ◽  
Keith A. Nelson
Keyword(s):  
High Power ◽  
Pulse Front ◽  
Terahertz Pulses
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