Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Sascha Preu"'
Publikováno v:
Beilstein Journal of Nanotechnology, Vol 15, Iss 1, Pp 1030-1040 (2024)
A new 3D micro-nano integrated M-shaped carbon nanotube (CNT) architecture was designed and fabricated. It is based on vertically aligned carbon nanotube arrays composed of low-density, mainly double-walled CNTs with simple lateral external contacts
Externí odkaz:
https://doaj.org/article/d6dd05ac267e4f5c98cb85e950b48c51
Autor:
Sumer Makhlouf, Oleg Cojocari, Martin Hofmann, Tadao Nagatsuma, Sascha Preu, Nils Weimann, Heinz-Wilhelm Hubers, Andreas Stohr
Publikováno v:
IEEE Journal of Microwaves, Vol 3, Iss 3, Pp 894-912 (2023)
The rapid progress in semiconductor technology has vastly boosted the development of terahertz sources and receivers in terms of compactness, reliability, operation frequency, and output power. In this manuscript, we report on the latest achievements
Externí odkaz:
https://doaj.org/article/1a5180d0f79444868f465c2ea20c0ad7
Publikováno v:
IEEE Access, Vol 10, Pp 42061-42068 (2022)
We present an ultra-broadband and inexpensive photonic spectrum analyzer (PSA) for wireless signals with a frequency coverage from the microwave range till deep into the terahertz range. The difference frequency of two continuous-wave laser diodes wo
Externí odkaz:
https://doaj.org/article/3bc44ab4185b468d90408499fb1f9d64
Autor:
Alonso Ingar Romero, Amlan kusum Mukherjee, Anuar Fernandez Olvera, Mario Méndez Aller, Sascha Preu
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021)
The authors demonstrate a far-field approach for height profile measurements with sub-millimetre waves. By evaluating Fabry-Pérot oscillations within surface-structured samples, combined with a Hilbert-transform approach, they visualize structures w
Externí odkaz:
https://doaj.org/article/0ae04f66f63249c39d9afa3ef1d6673f
Autor:
Deniz Turan, Ping Keng Lu, Nezih T. Yardimci, Zhaoyu Liu, Liang Luo, Joong-Mok Park, Uttam Nandi, Jigang Wang, Sascha Preu, Mona Jarrahi
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Semiconductor surface states often stand in the way of device performance, but here, the authors take advantage of them for wavelength conversion. They present a compact, passive conversion device insensitive to optical alignment by using plasmon-cou
Externí odkaz:
https://doaj.org/article/e76a8462b39f4eadbcb84af9440aa675
Autor:
Christoph Hoog Antink, Romina Schulz, Maurice Rohr, Konstantin Wenzel, Lars Liebermeister, Robert Kohlhaas, Sascha Preu
Publikováno v:
Sensors, Vol 23, Iss 11, p 5233 (2023)
We use a high-sampling rate terahertz (THz) homodyne spectroscopy system to estimate thoracic movement from healthy subjects performing breathing at different frequencies. The THz system provides both the amplitude and phase of the THz wave. From the
Externí odkaz:
https://doaj.org/article/cbcacfb209104470aa774af7c163f287
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:
Anuar de Jesus Fernandez Olvera, Benedikt Leander Krause, Andres Betancur-Perez, Uttam Nandi, Cristina de Dios, Pablo Acedo, Sascha Preu
Publikováno v:
IEEE Access, Vol 9, Pp 95391-95400 (2021)
We introduce a new scheme for the detection of terahertz pulses based on the frequency selective optoelectronic downconversion of its individual modes with a continous-wave (CW) ErAs:InGaAs photoconductive antenna (PCA) driven by a comb-based CW phot
Externí odkaz:
https://doaj.org/article/2cd3714de3ff426abcdcdb1debbea081
Publikováno v:
IEEE Access, Vol 9, Pp 114339-114347 (2021)
We present an architecture for millimeter-wave spectrum analyzers with Hz resolution and precision based on heterodyne down-conversion using ErAs:InGaAs photoconductive mixers driven by a tunable ultra-narrow linewidth continuous-wave (CW) photonic l
Externí odkaz:
https://doaj.org/article/dcac4374c2d74b39827f9106968771e1
Publikováno v:
IEEE Journal of Microwaves, Vol 1, Iss 4, Pp 1015-1022 (2021)
We present a 2-port terahertz vector network analyzer (VNA) based on four continuous-wave (CW) photomixers and a pair of telecom-wavelength CW lasers. The presented optoelectronic VNA is free-space coupled and can operate continuously from 0.1 THz to
Externí odkaz:
https://doaj.org/article/1aacc493c68f4ba79ac05d8072ab9882