Imaging of plasmonic modes of nanostructures using high-resolution cathodoluminescence spectroscopy

PHYS 319

Nicholas Fang, nicfang@uiuc.edu1, Pratik Chaturvedi2, Anil Kumar3, and Keng H. Hsu, khsu5@uiuc.edu1. (1) Mechanical Science and Engineering, University of Illinois at Urbana Champaign, 1206 w. green st, Urbana, IL 61801, (2) Department of Mechanical Science and Engineering, University of Illinois Urbana Champaign, Urbana, (3) Department of Electrical & Computer Engineering, University of Illinois Urbana Champaign, Urbana
In this study, high-resolution cathodoluminescence imaging technique has been employed to study plasmonic modes of nanostructures fabricated on Ag and Au films. Direct excitation and emission of decoupled surface plasmon modes is observed with panchromatic and monochromatic imaging techniques. With monochromatic imaging, we are able to distinguish the emission regions of different plasmon modes. Furthermore, nanostructures when coated with ultrathin dielectric layers exhibit a shift in the resonant modes, a behavior intrinsic to surface plasmons. A strong emission enhancement associated with periodic nanostructures is reported.
 

Spectroscopy, Chemistry, and Imaging through Nanophotonics
1:20 PM-5:20 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 340/341, Oral

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008