Zobrazeno 1 - 10
of 412
pro vyhledávání: '"Hartmut G. Roskos"'
Autor:
Fanqi Meng, Zhenling Tang, Petr Ourednik, Jahnabi Hazarika, Michael Feiginov, Safumi Suzuki, Hartmut G. Roskos
Publikováno v:
APL Photonics, Vol 9, Iss 8, Pp 086103-086103-8 (2024)
Oscillators based on resonant tunneling diodes (RTDs) are able to reach the highest oscillation frequency among all electronic THz emitters. However, the emitted power from RTDs remains limited. Here, we propose linear RTD oscillator arrays capable o
Externí odkaz:
https://doaj.org/article/7040a10937b34d3aaca8e38020f49d2f
Autor:
Fanqi Meng, Frederik Walla, Sergey Kovalev, Jan-Christoph Deinert, Igor Ilyakov, Min Chen, Alexey Ponomaryov, Sergey G. Pavlov, Heinz-Wilhelm Hübers, Nikolay V. Abrosimov, Christoph Jungemann, Hartmut G. Roskos, Mark D. Thomson
Publikováno v:
Physical Review Research, Vol 5, Iss 4, p 043141 (2023)
We investigate ultrafast harmonic generation (HG) in Si:B, driven by intense pump pulses with fields reaching ∼100kVcm^{−1} and a carrier frequency of 300 GHz, at 4 K and 300 K, both experimentally and theoretically. We report several findings co
Externí odkaz:
https://doaj.org/article/97e7faecbcdf42079d00a04964207721
Publikováno v:
APL Photonics, Vol 8, Iss 2, Pp 026103-026103-8 (2023)
Antenna-coupled photomixers, serving as emitters and receivers of terahertz (THz) radiation, are the central active components of coherent optoelectronic THz systems. Here, we focus on the continuous-wave modality, which finds ample use for spectrosc
Externí odkaz:
https://doaj.org/article/925c2441b6544357bc5ec0bde731748b
Autor:
Rahul Yadav, Florian Ludwig, Fahd Rushd Faridi, J. Michael Klopf, Hartmut G. Roskos, Sascha Preu, Andreas Penirschke
Publikováno v:
Sensors, Vol 23, Iss 7, p 3469 (2023)
We present the characterization of a Zero-bias Schottky diode-based Terahertz (THz) detector up to 5.56 THz. The detector was operated with both a table-top system until 1.2 THz and at a Free-Electron Laser (FEL) facility at singular frequencies from
Externí odkaz:
https://doaj.org/article/ebfd1c621bdc47019eb7889ca9915f8a
Autor:
Matthias M. Wiecha, Shihab Al-Daffaie, Andrey Bogdanov, Mark D. Thomson, Oktay Yilmazoglu, Franko Küppers, Amin Soltani, Hartmut G. Roskos
Publikováno v:
ACS Omega, Vol 4, Iss 26, Pp 21962-21966 (2019)
Externí odkaz:
https://doaj.org/article/841ee53a10a54a338c52f11c11b806a4
Publikováno v:
Sensors, Vol 21, Iss 12, p 4092 (2021)
In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced pow
Externí odkaz:
https://doaj.org/article/f93729f22fc24350af815135e15f27c5
Publikováno v:
APL Photonics, Vol 4, Iss 10, Pp 106108-106108-9 (2019)
Holographic imaging techniques, which exploit the coherence properties of light, enable the reconstruction of the 3D scenery being viewed. While the standard approaches for the recording of holographic images require the superposition of scattered li
Externí odkaz:
https://doaj.org/article/94268fd9c6da4a8fa38919afc3976478
Autor:
Dovilė Čibiraitė-Lukenskienė, Kęstutis Ikamas, Tautvydas Lisauskas, Viktor Krozer, Hartmut G. Roskos, Alvydas Lisauskas
Publikováno v:
Sensors, Vol 20, Iss 15, p 4087 (2020)
This work presents, to our knowledge, the first completely passive imaging with human-body-emitted radiation in the lower THz frequency range using a broadband uncooled detector. The sensor consists of a Si CMOS field-effect transistor with an integr
Externí odkaz:
https://doaj.org/article/f80a7fa841074b1c91b25e15c8283239
Autor:
Alvydas Lisauskas, Kęstutis Ikamas, Sylvain Massabeau, Maris Bauer, Dovilė Čibiraitė, Jonas Matukas, Juliette Mangeney, Martin Mittendorff, Stephan Winnerl, Viktor Krozer, Hartmut G. Roskos
Publikováno v:
APL Photonics, Vol 3, Iss 5, Pp 051705-051705-8 (2018)
We propose to exploit rectification in field-effect transistors as an electrically controllable higher-order nonlinear phenomenon for the convenient monitoring of the temporal characteristics of THz pulses, for example, by autocorrelation measurement
Externí odkaz:
https://doaj.org/article/22498ef0d749412dab91ce4e913f9795
Autor:
Fanqi Meng, Feifan Han, Ulrich Kentsch, Alexej Pashkin, Ciaran Fowley, Lars Rebohle, Mark D. Thomson, Safumi Suzuki, Masahiro Asada, Hartmut G. Roskos
Publikováno v:
Optics Letters 47(2022), 4969-4972
We investigate the coherent coupling of metamaterial resonators with hydrogen-like boron acceptors in Si at cryogenic temperatures. When the resonance frequency of the metamaterial, chosen to be in the range 7–9 THz, superimposes the transition fre