Ultrafast control and monitoring of material properties using terahertz pulses

Technical Report · Mon May 02 04:00:00 EDT 2016

DOI:https://doi.org/10.2172/1334176· OSTI ID:1334176

Bowlan, Pamela Renee ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Lab. for Ultrafast Materials Optical Science (LUMOS)

These are a set of slides on ultrafast control and monitoring of material properties using terahertz pulses. A few of the topics covered in these slides are: How fast is a femtosecond (fs), Different frequencies probe different properties of molecules or solids, What can a THz pulse do to a material, Ultrafast spectroscopy, Generating and measuring ultrashort THz pulses, Tracking ultrafast spin dynamics in antiferromagnets through spin wave resonances, Coherent two-dimensional THz spectroscopy, and Probing vibrational dynamics at a surface. Conclusions are: Coherent two-dimensional THz spectroscopy: a powerful approach for studying coherence and dynamics of low energy resonances. Applying this to graphene we investigated the very strong THz light mater interaction which dominates over scattering. Useful for studying coupled excitations in multiferroics and monitoring chemical reactions. Also, THz-pump, SHG-probe spectoscopy: an ultrafast, surface sensitive probe of atomic-scale symmetry changes and nonlinear phonon dymanics. We are using this in Bi₂Se₃ to investigate the nonlinear surface phonon dynamics. This is potentially very useful for studying catalysis.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1334176
• Report Number(s): LA-UR--16-23035
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Material Science