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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Book ChapterDOI
Ultrahigh frequency acoustic phonon generation and spectroscopy with Deathstar pulse shaping
TL;DR: In this article, a novel pulse shaping technique is used to generate tunable multiple-cycle acoustic waves with 2-500 GHz frequencies, which are used for study of nanoscale inhomogeneities and dynamics in amorphous materials.
Journal ArticleDOI
Single-pulse and multiple-pulse femtosecond spectroscopy: Progress toward collective mode-selective chemistry
TL;DR: In this article, a review of femtosecond pulse-shaping and multiple-pulse femtocond spectroscopy with the ultimate aim of coherent optical control over condensed material behavior and structure is presented.
Nonlinear high-temperature superconducting terahertz metamaterials
Nathaniel K. Grady,Bradford G. Perkins,Harold Y. Hwang,Nathaniel C. Brandt,Darius H. Torchinsky,Ranjan Singh,Li Yan,Daniel T. Trugman,Stuart A. Trugman,Quanxi Jia,Antoinette J. Taylor,Keith A. Nelson,Hou-Tong Chen +12 more
TL;DR: In this paper, the authors report the observation of a nonlinear terahertz response of split-ring resonator arrays made of high-temperature superconducting films.
Book ChapterDOI
Polaritonics in complex structures: Confinement, bandgap materials, and coherent control
David W. Ward,Eric Statz,Jaime D. Beers,Thomas Feurer,John D. Joannopoulos,Ryan M. Roth,Richard M. Osgood,Kevin J. Webb,Keith A. Nelson +8 more
TL;DR: In this paper, the design, fabrication, and testing of ferroelectric patterned materials in the guided-wave and polaritonic regime were described. And they demonstrate their functionality and exploit polariton confinement for amplification and coherent control using temporal pulse shaping.
Posted Content
From populations to coherences and back again: a new insight about rotating dipoles
TL;DR: In this paper, the effects of terahertz-frequency free-induction decay (FID) emission from rotationally excited molecules are investigated from a molecular rotor perspective.