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Near-field spectral effects due to electromagnetic surface excitations
Shchegrov1, Joulain, Carminati
1Rochester Theory Center for Optical Science and Engineering and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627-0171, USA.
Physical Review Letters
|September 6, 2000
Summary
Electromagnetic emission spectra differ significantly between near and far zones due to evanescent mode loss. These spectral changes are most notable in systems supporting surface waves.
Area of Science:
- Physics
- Electromagnetism
- Surface Science
Background:
- Electromagnetic emission from surface systems is crucial in various scientific fields.
- Understanding the spatial characteristics of emitted spectra is essential for accurate analysis.
- Evanescent modes play a role in near-field phenomena but are typically lost in the far-field.
Purpose of the Study:
- To theoretically investigate the differences in electromagnetic emission spectra between the near-field and far-field zones.
- To identify the underlying physical mechanisms responsible for spectral variations.
- To determine the influence of surface waves on these spectral differences.
Main Methods:
- Theoretical modeling of electromagnetic emission from surface systems.
- Analysis of spectral properties in both near-field and far-field regions.
- Investigation of the role of evanescent modes and surface waves in spectral modifications.
Main Results:
- Demonstrated significant spectral differences in electromagnetic emission between near and far zones.
- Identified the loss of evanescent modes as the primary cause of these spectral changes.
- Observed that spectral variations are particularly pronounced in systems supporting surface waves.
Conclusions:
- The spatial zone significantly impacts the observed electromagnetic emission spectra of surface systems.
- Evanescent mode propagation and subsequent loss are critical factors in near-field to far-field spectral transitions.
- Surface wave phenomena enhance the spectral distinctions between near and far-field observations.
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