Surface plasmons

Chapter 12 Surface IntroductionThe interaction of metals with electromagnetic radiation is largely dictated by thefree conduction electrons in the metal. According to the simple Drude model, thefree electrons oscillate 180 out of phase relative to the driving electric field. As aconsequence, most metals possess a negative dielectric constant at optical frequencieswhich causes a very high reflectivity. Furthermore, at optical frequencies themetal 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 withlight. Similar behavior cannot be simply reproduced in other spectral ranges us-ing the scale invariance of Maxwell s equations since the material parameterschangeconsiderably with frequency.

metal’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-

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  Surfaces, Resonance, Plasmon

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