Raman, Photoemission Electron Microscopy and Laser Desorption of Plasmonic Metal Nanostructures and Hybrid Metal - Insulator Photoemitters
EMSL Project ID
50431
Abstract
The goal of this proposal is to measure structurally-dependent electronic bulk and surface dynamics of electrons, holes, and excitons, on different but well-characterized hybrid materials, using complimentary techniques. PEEM is capable of femtosecond time resolution, and uses highly versatile photoemission detection, but has limited spatial resolution (>10 nm). Laser desorption probes mechanistic details of excited state surface dynamics by probing kinetic energies of emitted atoms. Together, these interface specific and time- and spatially-resolved techniques provide a revealing window into the key dynamical factors of laser materials interactions. Our experimental measurements will focus on excited state dynamics on various hybrid metal-insulator structures and plasmonic metal nanostructures. To achieve femtosecond time resolution and nanometer spatial resolution, we will use time-resolved photoemission electron microscopy (TR-PEEM) and tip enhanced Raman spectroscopy (SERS). Furthermore, since surface defects have great impact on the chemical and material properties, it is revealing to study surfaces with different defect densities. Thin film samples with controllable surface and bulk defect densities will be produced using standard preparation techniques such as laser or particle activation.
Project Details
Start Date
2018-10-01
End Date
2021-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Bhattarai A., K.T. Crampton, A.G. Joly, L. Kovarik, W.P. Hess, and P.Z. El-Khoury. 2018. "Imaging the Optical Fields of Functionalized Silver Nanowires through Molecular TERS." The Journal of Physical Chemistry Letters 9, no. 24:7105-1709. PNNL-SA-139471. doi:10.1021/acs.jpclett.8b03324
Crampton K.T., A.G. Joly, and P.Z. El-Khoury. 2019. "Direct Visualization of Counter-Propagating Surface Plasmons in Real Space-Time." Journal of Physical Chemistry Letters 10, no. 19:5694-5699. PNNL-SA-146664. doi:10.1021/acs.jpclett.9b02151
Joly A.G., P.Z. El-Khoury, and W.P. Hess. 2018. "Spatiotemporal Imaging of Surface Plasmons Using Two-Color Photoemission Electron Microscopy." Journal of Physical Chemistry C 122, no. 36:20981-20988. PNNL-SA-134196. doi:10.1021/acs.jpcc.8b05849
Joly A.G., Y. Gong, P.Z. El-Khoury, and W.P. Hess. 2018. "Surface Plasmon-Based Pulse Splitter and Polarization Multiplexer." Journal of Physical Chemistry Letters 9, no. 21:6164-6168. PNNL-SA-137832. doi:10.1021/acs.jpclett.8b02643