An important spectroscopic technique relying on these particles involves the preparation of a prism coated with a noblemetal Âlm in what's known as a Kretschmann conÂguration.
An important spectroscopic technique relying on these particles involves the preparation of a prism coated with a noblemetal Âlm in what's known as a Kretschmann conÂguration. In the transverse mode, these particles have a dispersion relationthat gives their frequency as the product of the wave vector times the square root of the ratio of the sum of two dielectricfunctions divided by the product of those dielectric functions. The existence of these particles makes possible a type of waveguidebased on their transfer through linear chains of nanoparticles, and unlike dielectric waveguides, waveguides using theseparticles involve evanescent Âelds on two sides of an interface. When they occur in the "bulk" variant, these particles representlongitudinal oscillation modes and cannot couple to incoming photons. The "surface" variants of these particles occur at theinterface between materials where the real part of the dielectric changes sign, and their localized excitation results in an enhancedsignal during Raman spectroscopy. For 10 points, identify these collective oscillations of free electrons in bulk metals.
An important spectroscopic technique relying on these particles involves the preparation of a prism coated with a noblemetal Âlm in what's known as a Kretschmann conÂguration.
plasmons [accept plasma oscillation]