K
Keith A. Nelson
Researcher at Massachusetts Institute of Technology
Publications - 750
Citations - 30478
Keith A. Nelson is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Terahertz radiation & Femtosecond. The author has an hindex of 85, co-authored 727 publications receiving 26755 citations. Previous affiliations of Keith A. Nelson include Harvard University & Philips.
Papers
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Nonlinear ultrafast dynamics of high temperature YBa[subscript 2]Cu[subscript 3]O[subscript 7-δ] superconductors probed with THz pump / THz probe spectroscopy
Bradford G. Perkins,H. Y. Hwang,Nathaniel K. Grady,L. Yan,Daniel T. Trugman,Q. Jia,H. T. Chen,A. J. Taylor,Keith A. Nelson +8 more
TL;DR: In this article, the authors used a two-fluid model to explore recombination dynamics as strong THz pulses excite electrons in YBCO above the superconductive gap to break superconductivity, which then relax by transferring energy into phonon modes in the crystal.
Proceedings ArticleDOI
Terahertz polaritonics: High-field THz coherent control and spectroscopy
TL;DR: In this article, the tools of THz polaritonics are extended for improved polariton amplification and for nonlinear THz spectroscopy using amplified and focused polariton waveforms.
Patent
Systeme d'analyse optique d'un echantillon comportant une source pompe-sonde laser
Thomas Pezeril,Keith A. Nelson +1 more
TL;DR: In this article, a systeme d'analyse optique d'un echantillon (1) du type comportant une source pompe-sonde laser modulee (2) adaptee pour delivrer a partir de l'echantillon, d'une part un signal de reference and d'autre part un signaux de analysis de celui-ci and des moyens d'analysis of ces signaux for deliving an information de reponse of l'echantillon.
Proceedings ArticleDOI
Probing Biexcitons in Quantum Dots using Femtosecond Pump/Probe and Two Dimensional Electronic Spectroscopy
Pooja Tyagi,Katherine W. Stone,Daniel B. Turner,Samuel L. Sewall,Keith A. Nelson,Patanjali Kambhampati +5 more
TL;DR: In this article, the electronic structure of biexcitons in CdSe quantum dots using state-selective femtosecond pump/probe spectroscopy was reported.
Posted Content
Experimental determinations of polariton-polariton interactions in microcavities
David W. Snoke,V. Hartwell,Jonathan Beaumariage,Shouvik Mukherjee,Yoseob Yoon,D. M. Myers,Mark Steger,Zheng Sun,Keith A. Nelson,L. N. Pfeiffer +9 more
TL;DR: In this paper, the effect of many-body effects on the polariton-polariton interaction strength has been analyzed in microcavities with polariton condensates, with the low values mostly coming from high polariton density, and the high values coming from experiments at low density.