Laser Desorption, Raman, Photoemission and Electron Microscopy of Hybrid Metal - Insulator Nanostructures
EMSL Project ID
48129
Abstract
The details of how photons couple to wide bandgap materials and the consequences of these excitations such as particle emission and field enhancement are playing increasingly important roles in several technologies and applications, including chemical analysis, semiconductor manufacture, pulsed electron sources, and the use high power lasers for X-ray production. Laser interactions with nominally transparent (wide bandgap) materials are greatly altered when the insulator is in close contact with a metal. Our goal is to understand excited state dynamics wide band-gap materials on conducting substrates. Many nominally transparent, wide band-gap materials can be processed with femtosecond lasers. The short duration of these pulses allows extensive electronic excitation on ultrafast time scales. We wish to understand clear differences in laser-materials interactions of pure insulators (e.g. alkali halides and metal oxides) and hybrid materials constructed from thin insulator films on metals. We will also explore plasmonic metal nanostructures and hybrid insulator covered nanostructures to determine their plasmonic field enhancement and photoelectron emission properties. Field enhancement measurements will conducted using photoemission electron microscopy (PEEM) and correlated with surface enhanced Raman Spectroscopy (SERS) experiments.
Project Details
Start Date
2013-09-04
End Date
2015-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Co-Investigator(s)
Team Members
Related Publications
Droubay T, SA Chambers, AG Joly, WP Hess, K Nemeth, KC Harkay, and L Spentzouris. 2014. "Metal-Insulator Photocathode Heterojunction for Directed Electron Emission." Physical Review Letters 112(6):067601(5). doi:10.1103/PhysRevLett.112.067601
El-Khoury PZ, and WP Hess. 2014. "Vibronic Raman Scattering at the Quantum Limit of Plasmons." Nano Letters 14(7):4114-4118. doi:10.1021/nl501690u
El-Khoury PZ, D Hu, and WP Hess. 2013. "Junction Plasmon-Induced Molecular Reorientation." Journal of Physical Chemistry Letters 4(20):3435-3439. doi:10.1021/jz401838b
El-Khoury PZ, EJ Bylaska, and WP Hess. 2013. "Time Domain Simulations of Chemical Bonding Effects in Surface-Enhanced Spectroscopy." Journal of Chemical Physics 139(17):Article No. 174303. doi:10.1063/1.4827455
El-Khoury PZ, E Khon, Y Gong, AG Joly, P Abellan, JE Evans, ND Browning, D Hu, M Zamkov, and WP Hess. 2014. "Electric Field Enhancement in a Self-Assembled 2D Array of Silver Nanospheres." Journal of Chemical Physics 141(21):Article No. 214308. doi:10.1063/1.4902905
El-Khoury PZ, Y Gong, P Abellan, BW Arey, AG Joly, D Hu, JE Evans, ND Browning, and WP Hess. 2015. "Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields." Nano Letters. doi:10.1021/acs.nanolett.5b00609
Gong Y, AG Joly, D Hu, PZ El-Khoury, and WP Hess. 2015. "Ultrafast Imaging of Surface Plasmons Propagating on a Gold Surface." Nano Letters 15(5):3472-8. doi:10.1021/acs.nanolett.5b00803
Kong L, AG Joly, T Droubay, Y Gong, and WP Hess. 2014. "Enhanced Quantum Efficiency From Hybrid Cesium Halide/Copper Photocathode." Applied Physics Letters 104(17):Article No. 171106. doi:10.1063/1.4874339