Surface plasmon resonance

Surface plasmon resonance (SPR) for planar surfaces or localized surface plasmon resonance (LSPR) for nanometer-sized metallic structures is the phenomenon caused by the excitation of surface plasmons by light. Localized surface plasmon polaritions (LSPRs) are collective electron charge oscillations in metallic nanoparticles that are excited by light. They exhibit enhanced near-field amplitude at the resonance wavelength. This field is highly localized at the nanoparticle and decays rapidly away from the nanoparticle/dieletric interface into the dielectric background, though far-field scattering by the particle is also enhanced by the resonance. Typical metals that support surface plasmons are silver and gold, but metals such as copper, titanium or chromium are also known to be applicable. Surface plasmons have been used to enhance the surface sensitivity of several spectroscopic measurements and can be used to detect molecular adsorption, such as polymers, DNA or proteins, etc. The mechanism of detection is based on that the adsorbing molecules cause changes in the local index of refraction, changing the resonance conditions of the surface plasmon waves. For nanoparticles, localized surface plasmon oscillations can give rise to the intense colors of suspensions or sols containing the nanoparticles. Nanoparticles or nanowires of noble metals exhibit strong absorption bands in the ultraviolet-visible light regime that are not present in the bulk metal. This extraordinary absorption increase has been exploited to increase light absorption in photovoltaic cells by depositing metal nanoparticles on the cell surface.

Further information

1. J. Britt Lassiter, Mark W. Knight, Nikolay A. Mirin and Naomi J. Halas. Reshaping the Plasmonic Properties of an Individual Nanoparticle. Nano Lett., 2009, 9 (12), pp 4326–4332.
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3. Magnus P. Jonsson, Peter Jönsson, Andreas B. Dahlin, and Fredrik Höök. Supported Lipid Bilayer Formation and Lipid-Membrane-Mediated Biorecognition Reactions Studied with a New Nanoplasmonic Sensor Template. Nano Lett., 2007, 7 (11), pp 3462–3468.
4. G. X. Du et al. (2010). "Evidence of localized surface plasmon enhanced magneto-optical effect in nanodisk array". Appl. Phys. Lett. 96: 081915.
5. H. M. Hiep et al. (2007). "A localized surface plasmon resonance based immunosensor for the detection of casein in milk" (free download pdf). Sci. Technol. Adv. Mater. 8: 331.
6. K. Locharoenrat et al. (2007). "Phenomenological studies of optical properties of Cu nanowires" Sci. Technol. Adv. Mater. 8: 277.
7. А.А. Ораевский, А.Н. Ораевский, "О плазмонном резонансе в наночастицах эллипсоидальной формы", Квант. электроника, 2002, 32 (1), 79–82.
8. Liu, G.L., Long, Y.-T., Choi, Y., Kang, T., Lee, L.P. (2007). "Quantized plasmon quenching dips nanospectroscopy via plasmon resonance energy transfer". Nature Methods, Published online: 18 November 2007.
9. Статья Surface plasmon resonance из Wikipedia, свободной энциклопедии. Доступно под лицензией Creative Commons Attribution-Share Alike.

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