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

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.
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https://hal-utt.archives-ouvertes.fr/hal-02363912
Contributor : Daniel Gavrysiak <>
Submitted on : Thursday, November 14, 2019 - 4:04:49 PM
Last modification on : Friday, March 27, 2020 - 4:28:02 PM

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

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