Zobrazeno 1 - 10
of 52
pro vyhledávání: '"G. Ramian"'
Autor:
Andrew T. Pierce, N. I. Agladze, G. Ramian, Mark S. Sherwin, Mary Lou P. Bailey, Aaron J. Simon, Devin T. Edwards
Publikováno v:
IEEE Transactions on Terahertz Science and Technology. 5:961-966
A simple, compact, high-performance absorbing load (absorber) for narrow-band THz spectroscopy is described. Current commercially available THz absorbers offering more than 20 dB return loss are bulky, made of proprietary materials, and intrinsically
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8596c1181dbab959f2abfafb478d9974
https://doi.org/10.1109/tthz.2015.2477609
https://doi.org/10.1109/tthz.2015.2477609
Autor:
L.-C. Brunel, G. Ramian, J. van Tol, Mark S. Sherwin, Songi Han, Susumu Takahashi, Devin T. Edwards
Publikováno v:
Nature. 489:409-413
Electron paramagnetic resonance (EPR) spectroscopy interrogates unpaired electron spins in solids and liquids to reveal local structure and dynamics; for example, EPR has elucidated parts of the structure of protein complexes that other techniques in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f5498e8eda99041c99b6fce41ad13a5
https://doi.org/10.1038/nature11437
https://doi.org/10.1038/nature11437
Autor:
G. Ramian, R. Scheuerer, Karl Friedrich Renk, Kirill N. Alekseev, A.E. Zhukov, Ekkehard Schomburg, A.R. Kovsh, V. Ustinov, S. J. Allen, Florian Klappenberger, J. S. Scott
Publikováno v:
The European Physical Journal B. 39:483-489
We report an experimental study indicating ultrafast creation and annihilation of space-charge domains in a semiconductor superlattice under the action of a THz field. Our experiment was performed for an InGaAs/InAlAs superlattice with the conduction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbe0a2c579a448b0684ff2f0bf3d500c
https://doi.org/10.1140/epjb/e2004-00221-y
https://doi.org/10.1140/epjb/e2004-00221-y
Autor:
G. Ramian, Dan Allen, Jason Seifter, Mark S. Sherwin, Susumu Takahashi, Johan van Tol, Louis-Claude Brunel
Publikováno v:
Infrared Physics & Technology. 51:426-428
We describe the first free-electron laser (FEL)-based pulsed electron paramagnetic resonance (EPR) system designed to study spin dynamics and structure changes of proteins in aqueous solution with nano-second of time resolution. This novel approach o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef6626c5372d4734c2d68ca519764ae9
https://doi.org/10.1016/j.infrared.2007.12.036
https://doi.org/10.1016/j.infrared.2007.12.036
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 393:220-224
Third harmonic lasing has been achieved in a Free-Electron Laser specifically designed to operate in that mode. So far, 40 W at 41 μm wavelength and 5.16 MeV beam energy has been measured. One of the most difficult challenges has been suppression of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d727fccb84532ca3a5738e4e333d9acd
https://doi.org/10.1016/s0168-9002(97)00472-5
https://doi.org/10.1016/s0168-9002(97)00472-5
Autor:
K. Craig, P. F. Hopkins, Arthur C. Gossard, J. S. Scott, C. L. Felix, B. J. Keay, T.Y. Liu, Mark S. Sherwin, M. Lui, G. Ramian, J.P. Kaminski, D. Chow, Andrea Markelz, S. J. Allen, James Heyman, P. Guimara˜es, K. L. Campman
Publikováno v:
Scopus-Elsevier
The UCSB free-electron lasers provide kilowatts of continuously tunable radiation from 120 GHz to 4.8 THz. They have the most impact on terahertz science and technology that require a tunable, high power source to explore non-linear dynamics or that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d550c96f41fc8717b8ac551d8a55781b
https://doi.org/10.1016/0022-2313(94)90142-2
https://doi.org/10.1016/0022-2313(94)90142-2
Autor:
G. Ramian
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 318:225-229
Two of three new FELs and their associated electron beam switchyard are now complete and operating at the University of California, Santa Barbara (UCSB). These constitute the primary radiation source of the UCSB Center for Free-Electron Laser Studies
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c157ab94e0fa3e87c77e30273115a1f
https://doi.org/10.1016/0168-9002(92)91056-f
https://doi.org/10.1016/0168-9002(92)91056-f
Publikováno v:
Physical Review Letters. 65:2251-2254
Mode competition in a far-infrared, free-electron laser operating in the quasi-cw regime has been investigated by means of direct spectral measurement with a heterodyne receiver system. About 30% of the spectra had a single longitudinal mode. The obs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be8cbb389dab14f3a465fa614742e4bf
https://doi.org/10.1103/physrevlett.65.2251
https://doi.org/10.1103/physrevlett.65.2251
Autor:
Jing Xu, Pavlos G. Savvidis, Kevin W. Plaxco, Jhenny F. Galan, G. Ramian, Anthony Scopatz, Robert R. Birge, S. James Allen
Publikováno v:
SPIE Proceedings.
Biopolymers such as proteins, DNA and RNA fold into large, macromolecular chiral structures. As charged macromolecules, they absorb strongly in the terahertz due to large-scale collective vibrational modes; as chiral objects, this absorption should b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c2371532602d72ca1a5abf97021dbbb
https://doi.org/10.1117/12.518533
https://doi.org/10.1117/12.518533
Autor:
Jhenny F. Galan, S. James Allen, Anthony Scopatz, Robert R. Birge, Kevin W. Plaxco, G. Ramian, Jing Xu, Pavlos G. Savvidis
Publikováno v:
Astrobiology. 3(3)
We propose a terahertz (far-infrared) circular dichroism-based life-detection technology that may provide a universal and unequivocal spectroscopic signature of living systems regardless of their genesis. We argue that, irrespective of the specifics
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88b21d570fc30038caae32f2e4003c51
https://pubmed.ncbi.nlm.nih.gov/14678660
https://pubmed.ncbi.nlm.nih.gov/14678660