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Percolation-enhanced nonlinear scattering from metal-dielectric composites
A K Sarychev1, V A Shubin, V M Shalaev
1Department of Physics, New Mexico State University, Las Cruces, NM 88003, USA.
Summary
Giant local electric field fluctuations cause large nonlinear scattering in metal-dielectric composites near the percolation threshold. These "hot" spots dramatically enhance scattering effects in random materials.
Area of Science:
- Condensed matter physics
- Materials science
- Photonics
Background:
- Metal-dielectric composites exhibit unique optical properties.
- Percolation theory describes phase transitions in disordered systems.
- Nonlinear scattering is crucial for optical device applications.
Purpose of the Study:
- To investigate nonlinear scattering phenomena in metal-dielectric composites.
- To understand the role of percolation in enhancing optical effects.
- To identify the mechanisms behind large scattering enhancements.
Main Methods:
- Fabrication of metal-dielectric random composites.
- Experimental measurements of nonlinear scattering.
- Theoretical modeling of electric field distributions.
Main Results:
- Observed large percolation-enhanced nonlinear scattering near the percolation threshold.
- Identified giant local electric field fluctuations as the cause.
- Characterized "hot" spots with fields orders of magnitude higher than the applied field.
Conclusions:
- Percolation significantly enhances nonlinear scattering in these composites.
- Localized field enhancements in "hot" spots are responsible for the observed effects.
- Findings have implications for designing advanced optical materials and devices.