- Speaker: Prof. Markus B. Raschke (Department of Physics, University of Colorado)
- Date: July 24, 2017 (Monday, 11:00 - 12:00)
- Place: Seminar Room 116, KU R&D Center
Abstract
I will present the advances in multimodal linear, nonlinear, and spatio-temporal nanoimaging
for the study of fundamental optical and plasmonic phenomena, coupled
single molecule or quantum dynamics, with unprecedented nanometer spatial and
femtosecond resolution, sensitivity and precision [1-6]. To gain the desired
simultaneous nanometer spatial resolution with spectroscopic specificity and
femtosecond temporal resolution we combine plasmonic and optical antenna concepts
with ultrafast and shaped laser pulses to precisely control optical excitation on
femtosecond time and nanometer length scales from the visible to THz spectral range.
In the implementation with scattering scanning nearfield microscopy (s-SNOM) or other
tip-enhanced microscopy modalities with nonlinear, ultrafast, and IR and Raman
vibrational spectroscopies, the resulting enhanced and qualitatively new forms of lightmatter
interaction enable deep-subwavelength spatially resolved imaging of
heterogeneities and nano-confinement as they define the properties of most functional
materials. I will present several new concepts extending tip-enhanced spectroscopy
into the nonlinear and ultrafast regime for nano-scale imaging and spectroscopy of
surface molecules and nanosolids.