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Plasmonics
Since
2001, there has been an explosive growth of scientific interest in the
role of plasmons in optical phenomena including guided-wave propagation
and imaging at the subwavelength scale, nonlinear spectroscopy and negative
index metamaterials. The unusual dispersion properties of metals near
the plasmon resonance enables excitation of surface modes and resonant
modes in nanostructures that access a very large range of wavevectors
over a narrow frequency range, and accordingly, resonant plasmon excitation
allows for light localization in ultra-small volumes. This feature constitutes
a critical design principle for light localization below the free space
wavelength and opens the path to truly nanoscale plasmonic optical devices.
This principle, combined with quantitative electromagnetic simulation
methods and a broad portfolio of established and emerging nanofabrication
methods creates the conditions for dramatic scientific progress and a
new class of subwavelength optical components.
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