Laser Desorption from Metal Oxides and Two-photon Photoemission Electron Microscopy
EMSL Project ID
39092
Abstract
Laser interactions with nominally transparent (wide bandgap) materials are playing increasingly important roles in several technologies and applications, including chemical analysis, semiconductor manufacture, and the use high power lasers for X-ray production and inertial fusion. The details of how photons couple to wide bandgap materials and the consequences of these excitations such as particle emission and lattice disruption are of principle interest. Also of interest are morphological changes of a surface due to laser irradiation. A number of applications are closely linked to the fundamental processes we study. The excitation of the localized surface plasmon resonance (SPR) on the noble metal nanostructure generates locally enhanced/amplified electromagnetic (EM) fields at the surface of the nanostructure, which are predicted to be larger than the incident optical excitation field. These enhanced fields have been used for various applications in chemical and biological detection systems, visible light-responsive photocatalysts, solar cells, light-emitting diodes, and SPR-mediated energy transfer. The quantitative measurement of the magnitude of these enhanced EM fields is critical to understanding fundamental physics at the nanometer scale, and also the integration of such nanostructures into optimized devices for potentially useful applications. We propose to use two-photon photoemission electron microscopy (2P-PEEM) to probe nanoscale-localized optical fields with spatial resolutions down to the sub-10 nm level, without perturbation of their intrinsic optical properties. This approach leads to direct characterization of the localized EM fields with quantitative information. The above capabilities allow 2P-PEEM to be used to probe the local registration of the ‘hot spots’ and to understand their structure-dependent origins. Fundamental understanding of these physical characteristics will enable the design and fabrication of novel electronic and photonic devices and other functional materials based on optically active nanostructures.
Project Details
Start Date
2010-01-14
End Date
2013-02-12
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
El-Khoury PZ, and WP Hess. 2013. "Raman Scattering from 1,3-Propanedithiol at a Hot Spot: Theory Meets Experiment." Chemical Physics Letters 581:57-63. doi:10.1016/j.cplett.2013.05.066
El-Khoury PZ, D Hu, VA Apkarian, and WP Hess. 2013. "Raman Scattering at Plasmonic Junctions Shorted by Conductive Molecular Bridges." Nano Letters 13(4):1858-1861. doi:10.1021/nl400733r
El-Khoury PZ, SJ Peppernick, D Hu, AG Joly, and WP Hess. 2013. "The Origin of Surface-Enhanced Raman Scattering of 4,4' -Biphenyldicarboxylate on Silver Substrates." Journal of Physical Chemistry C 117(14):7260-7268. doi:10.1021/jp401026x
Halliday MT, AG Joly, WP Hess, P Sushko, and AL Shluger. 2013. "Mechanisms of Photodesorption of Br Atoms from CsBr Surfaces." Journal of Physical Chemistry C 117(26):13502-13509. doi:10.1021/jp4036343
Peppernick SJ, AG Joly, KM Beck, and WP Hess. 2011. "Plasmonic Field Enhancement of Individual Nanoparticles by Correlated Scanning and Photoemission Electron Microscopy." Journal of Chemical Physics 134(3):034507-1/7. doi:10.1063/1.3543714
Peppernick SJ, AG Joly, KM Beck, and WP Hess. 2013. "Plasmon-Induced Optical Field Enhancement studied by Correlated Scanning and Photoemission Electron Microscopy." Journal of Chemical Physics 138(15):Article No. 154701. doi:10.1063/1.4799937