Mie plasmons: modes volumes, quality factors and coupling strengths (Purcell factor) to a dipolar emitter

Abstract

Using either quasi-static approximation or exact Mie expansion, we characterize the localized surface plasmons supported by a metallic spherical nanoparticle. We estimate the quality factor $Q_n$ and define the effective volume $V_n$ of the $n^{th}$ mode in a such a way that coupling strength with a neighbouring dipolar emitter is proportional to the ratio $Q_n/V_n$ (Purcell factor). The role of Joule losses, far-field scattering and mode confinement in the coupling mechanism are introduced and discussed with simple physical understanding, with particular attention paid to energy conservation.

(in press) International Journal of Optics (2011)

References in corpus (4)

• On the use of Purcell factors for plasmon antennas
• Spaser as Nanoscale Quantum Generator and Ultrafast Amplifier
• Strong coupling between a metallic nanoparticle and a single molecule
• Purcell factor for point-like dipolar emitter coupling to 2D-plasmonic waveguides

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• Purcell factor of Mie resonators featuring electric and magnetic modes
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• Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources
• Non-hermitian Hamiltonian description for quantum plasmonics: from dissipative dressed atom picture to Fano states
• Quantum Plasmonics with multi-emitters: Application to adiabatic control
• Resonance frequency and radiative Q-factor of plasmonic and dielectric modes of small objects
• Josephson surface plasmons in spatially confined cuprate superconductors
• Influence of spherical anisotropy on optical mass sensing in a molecular-plasmonic optomechanical system