Surface Plasmon Polaritons (SPPs) Introduction and basic ...
Plasmon polariton: coupled state between a plasmon and a photon. Phonon polariton: coupled state between a phonon and a photon. PlasmonsPlasmons A plasmon is the quantum of the collective excitation of freeelectrons in solids. Electron plasma effects are most pronounced in free-electron-like metals.
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Surface plasmons
www.photonics.ethz.chmetal’s free electron gas can sustain surface and volume charge density oscillations, called plasmon polaritons or plasmons with distinct resonance frequencies. The ex-istence of plasmons is characteristic for the interaction of metal nanostructures with light. Similar behavior cannot be simply reproduced in other spectral ranges us-
Chapter 7 Angular Spectrum Representation
www.photonics.ethz.chspread out only slowly in the transverse direction. Examples are laser beam prop-agation or optical waveguide applications. In these examples the wavevectors k = (kx,ky,kz) in the angular spectrum representation are almost parallel to the z-axis and the transverse wavenumbers (kx,ky) are small compared to k. We can then expand the square root ...
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