Georg Herink (Special Seminar)

Date(s) - Sep 23 2014
11:00 AM - 12:00 PM

Shasta Room, Bldg. 40, Room 361


Ultrafast Control of Photoemission from Nanostructures by Mid-Infrared and Terahertz Transients.

Georg Herink

Courant Research Centre, Gottingen, Germany

Metallic nanotips enable the localized generation of ultrashort electron pulses for ultrafast diffraction, imaging and spectroscopy. Long-wavelength excitation provides access to strong-field emission dynamics which are goverend by the momentary electric field and allow for sub-cycle acceleration in the enhanced apex nearfield. The local electric transient and resulting electron dynamics are mapped by THz-streaking spectroscopy. At high THz fields, a pump-probe scheme is presented which employes nonlinear field emission as an ultrafast probe for carrier dynamics inside the nanotip apex.