Measuring far-ultraviolet whispering gallery modes with high energy electrons
Appl. Phys. Lett. 93, 243106 (2008); doi:10.1063/1.3046731
Published 15 December 2008
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Dielectric nanospheres are important components for photonic applications, where interactions between whispering gallery modes (WGMs) can be used to construct photonic band structures. Using the electromagnetic fields generated by relativistic electrons in a monochromated 200 keV scanning transmission electron microscope, we record electron energy loss spectral features reflecting the density of states (DOS) of the electric-type WGMs in SiO2 nanospheres over an energy range extending into the far-ultraviolet regime. These results demonstrate possibilities for mapping the local DOS of photonic systems in an electron microscope with a spatial resolution of a few nanometers.
©2008 American Institute of Physics
| History: | Received 13 September 2008; accepted 5 November 2008; published 15 December 2008 |
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http://link.aip.org/link/?APPLAB/93/243106/1 |
KEYWORDS and PACS
dielectric materials,
electron energy loss spectra,
electronic density of states,
nanostructured materials,
permittivity,
photonic band gap,
scanning-transmission electron microscopy,
silicon compounds,
whispering gallery modes
- 61.46.-w
Structure of nanoscale materials - 77.22.Ch
Permittivity (dielectric function) - 42.70.Qs
Photonic bandgap materials - 77.84.Bw
Dielectric, piezoelectric, and ferroelectric elements, oxides, nitrides, borides, carbides, chalcogenides, etc - 79.20.Uv
Electron energy loss spectroscopy - 73.22.-f
Electronic structure of nanoscale materials - YEAR: 2008
RELATED DATABASES
PUBLICATION DATA
0003-6951 (print)
1077-3118 (online)
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