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Journal Articles Plasmonics Year : 2011

Improved Description of the Plasmon Resonance Wavelength Shift in Metallic Nanoparticle Pairs

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Abstract

We propose to use the compressed or stretched hyperbola for an efficient description of the plasmon resonance shift as a function of the gap between proximal nanoparticles in arrays of gold pairs. This function overcomes the limitation of describing this behavior by the well-known exponential function as it accounts for the near-field coupling and the far-field radiative coupling between particles . It has the advantage of mathematical simplicity with one dimensionless additional parameter compared to a simple exponential decay. We suggest that this parameter may be the signature of the grating effects. Most importantly this function works well in a wide variety of surrounding media and for nanostructures with arbitrary shapes. We expect that this function is an efficient tool for fundamental studies as it quantifies both the near-field coupling and the grating coupling. It is also a useful tool for applied studies like bio-sensing applications, by providing an improved plasmon ruler equation. Localized surface plasmon resonances in gold pairs are investigated using finite-difference time-domain simulations.

Dates and versions

hal-02363912 , version 1 (14-11-2019)

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Montacer Dridi, Alexandre Vial. Improved Description of the Plasmon Resonance Wavelength Shift in Metallic Nanoparticle Pairs. Plasmonics, 2011, 6 (4), pp.637-641. ⟨10.1007/s11468-011-9245-0⟩. ⟨hal-02363912⟩

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