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Mapping local optical densities of states in silicon photonic structures with nanoscale electron spectroscopy
- Publication Year :
- 2010
-
Abstract
- Relativistic electrons in a structured medium generate radiative losses such as Cherenkov and transition radiation that act as a virtual light source, coupling to the photonic densities of states. The effect is most pronounced when the imaginary part of the dielectric function is zero, a regime where in a non-retarded treatment no loss or coupling can occur. Maps of the resultant energy losses as a sub-5nm electron probe scans across finite waveguide structures reveal spatial distributions of optical modes in a spectral domain ranging from near-infrared to far ultraviolet.<br />Comment: 18 pages, 4 figures
- Subjects :
- Physics - Optics
Physics - Instrumentation and Detectors
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1002.3632
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.81.113102