Localized surface plasmon
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A Localized Surface Plasmon (LSP) is the result of The confinement of a Surface Plasmon in a nanoparticle of size comparable to or smaller than the wavelength of light used to excite the plasmon. The LSP has two important effects:
- Electric fields near the particle’s surface are greatly enhanced, this enhancement falls or quickly with distance from the surface.
- The particle’s optical extinction has a maximum at the plasmon resonant frequency. For noble metal nanoparticles this occurs at visible wavelengths.
LSP Applications
The Plasmon resonant frequency is highly sensitive to the refractive index of the environment The change in refractive index results in a shift in the resonant frequency, as the resonant frequency is easy to measure, this allows LSP nanoparticles to for nanoscale sensing applications.
References
- ^ Mayer, Kathryn M. (2011). "Localized Surface Plasmon Resonance Sensors". Chemical Reviews. Plasmonics (111): 3828–3857. doi:10.1021/cr100313v.
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