Zobrazeno 1 - 10
of 58
pro vyhledávání: '"B. Knüpfer"'
Autor:
Curd B. Knüpfer
Publikováno v:
American Studies Journal, Iss 61 (2016)
This article examines how various aspects of US politics and culture may define the boundaries of transnational online discourse. The argument presented focuses on two general categories by which these dynamics may emerge, namely systemic and agentia
Externí odkaz:
https://doaj.org/article/784b8c3dc4d245a98587c4a57b1fb370
Autor:
D. Streb, Ulrich D. Keil, Peter Kiesel, B. Knüpfer, Clavs B. Sørensen, S. Tautz, Gottfried H. Döhler, M. Ruff, Michael Kneissl, S. U. Dankowski
Publikováno v:
Materials Science and Engineering: B. 44:316-319
We report on the effects of growth temperature, arsenic source and post growth annealing treatment on the optical properties of low temperature grown GaAs. We have determined the absorption coefficient over a wide spectral range of energies between 0
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac5ccbfa638460dc5bd5a6181607f495
https://doi.org/10.1016/s0921-5107(96)01748-5
https://doi.org/10.1016/s0921-5107(96)01748-5
Autor:
Günther Tränkle, Peter Kiesel, Michael Kneissl, B. Knüpfer, Gottfried H. Döhler, S. Quassowski, Norbert Linder
Publikováno v:
IEEE Journal of Quantum Electronics. 31:1674-1682
The linearity of electrooptical waveguide modulators based on the Franz-Keldysh effect with respect to the voltage-transmission characteristic has been investigated experimentally and theoretically. For a GaAs-AlGaAs double heterostructure modulator
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::417704d80596fde15db9ea4d71c7e702
https://doi.org/10.1109/3.406382
https://doi.org/10.1109/3.406382
This paper presents recent progress on a novel multibeam antenna that is designed to serve as a key component for multiple transparent real-time capable data relays linking several LEO satellites to a single earth station via a GEO satellite. High da
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______518::3cc02117e78729d0c593a8ff97e36151
https://mediatum.ub.tum.de/1110729
https://mediatum.ub.tum.de/1110729
This paper presents a concept of a novel Ka-band receiving multibeam antenna that can be used for high-rate data relays between a GEO satellite and several LEO satellites. The antenna is a payload candidate for the German communications satellite Hei
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______518::27049b4444168e891776ffd93105e7c6
https://mediatum.ub.tum.de/doc/1110724/document.pdf
https://mediatum.ub.tum.de/doc/1110724/document.pdf
Autor:
M. Welker, Michael Moser, P. Riel, B. Knüpfer, Stefan Malzer, Karlheinz H. Gulden, G. H. Döhler
Publikováno v:
Applied Physics Letters. 71:3561-3563
We present a smart pixel with surface-normal optical input and output beams using a vertical cavity surface-emitting laser. In its present nonoptimized hybrid version, the smart pixel exhibits opto-optical switching with a contrast of 35 dB, an optic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::474a43c02f6815007d52afd751b41f6f
https://doi.org/10.1063/1.120391
https://doi.org/10.1063/1.120391
Autor:
S. U. Dankowski, M. Welker, Peter Kiesel, B. Knüpfer, Gottfried H. Döhler, Michael Kneissl, N. Muller, U. Hilburger
Publikováno v:
IEEE Photonics Technology Letters. 9:97-99
We report on the dynamic operation characteristics of a novel monolithic waveguide-based smart pixel. In this smart pixel, two surface-normal optical input beams control an optical output beam propagating in-plane through a waveguide modulator. For t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::86a3d362b7a7dd2c7734a9b9f85b8cfd
https://doi.org/10.1109/68.554513
https://doi.org/10.1109/68.554513
Autor:
W. Geibelbrecht, Karl Joachim Ebeling, C. Jung, M. Welker, Gottfried H. Döhler, B. Knüpfer, D. Wiedenmann, C. Oehler
Publikováno v:
CLEO/Europe Conference on Lasers and Electro-Optics.
We report on the characterization of a hybrid smart pixel using a special photoconductive switch [1] as receiver and a vertical cavity surface emitting laser (VCSEL) as transmitter component. Due to its special design, the photoconductive switch prov
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2afd5adb55ac601868a80ee897229a98
https://doi.org/10.1109/cleoe.1998.719342
https://doi.org/10.1109/cleoe.1998.719342
Autor:
Peter Kiesel, B. Knüpfer, Douglas R. Dykaar, Gottfried H. Döhler, R. F. Kopf, S. U. Dankowski, Michael Kneissl, Ulrich D. Keil
Publikováno v:
Scopus-Elsevier
GaAs grown at low temperatures (LT-GaAs, 210°C-250°C) is known to exhibit very short carrier lifetimes (1,2 and semi-insulating behaviour after annealing (≈550°C). Therefore, this material is very appealing for both fabrication of excellent insu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d99f6d556c2f435e77e8bf38ca17a205
https://doi.org/10.1109/cleoe.1994.636649
https://doi.org/10.1109/cleoe.1994.636649