Electron- and light-induced stimulated Raman spectroscopy for nanoscale molecular mapping

We propose and theoretically analyze a vibrational spectroscopy imaging technique, termed, termed electron- and light-induced stimulated Raman (ELISR) scattering, that combines the high spatial resolution of electron microscopy with the molecular sensitivity of surface-enhanced Raman spectroscopy. W...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2020-08, Vol.102 (8), p.1, Article 085406
Main Authors: Saleh, Amr A. E., Angell, Daniel K., Dionne, Jennifer A.
Format: Article
Language:English
Subjects:
Broadband
Computer simulation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electron beams
Electron energy loss spectroscopy
Energy dissipation
Excitation
High resolution
High resolution electron microscopy
Imaging techniques
Laser beams
Mapping
Microscopy
Nanoparticles
Nanorods
Nanospheres
Numerical models
Raman spectroscopy
Sensitivity enhancement
Spatial resolution
Spectrum analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We propose and theoretically analyze a vibrational spectroscopy imaging technique, termed, termed electron- and light-induced stimulated Raman (ELISR) scattering, that combines the high spatial resolution of electron microscopy with the molecular sensitivity of surface-enhanced Raman spectroscopy. With ELISR, electron-beam excitation of plasmonic nanoparticles is utilized as a spectrally-broadband but spatially-confined Stokes beam in the presence of a diffraction-limited pump laser. To characterize this technique, we develop a numerical model and conduct full-field electromagnetic simulations to investigate two distinct nanoparticle geometries, nanorods, and nanospheres, coated with a Raman-active material. Our results show the significant ( 106 – 107 ) stimulated Raman enhancement that is achieved with dual electron and optical excitation of these nanoparticle geometries. Importantly, the spatial resolution of this vibrational spectroscopy for electron microscopy is solely determined by the nanoparticle geometry and the plasmon mode volume. Our results highlight the promise of ELISR for simultaneous high-resolution electron microscopy with sub-diffraction-limited Raman spectroscopy, complementing advances in super-resolution microscopy, correlated light and electron microscopy, and vibrational electron energy loss spectroscopy.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.085406