Abstract
We study the interaction of focused radially-polarized light with metal nanospheres. By expanding the electromagnetic field in terms of multipoles, we gain insight on the excitation of localized surface plasmon-polariton resonances in the nanoparticle. We show that focused radially-polarized beams offer more opportunities than a focused plane wave or a Gaussian beam for tuning the near- and far-field system response. These results find applications in nano-optics, optical tweezers, and optical data storage.
Highlights
Focused radially-polarized beams (FRBs) find application in many fields of optics
It has been demonstrated that they achieve a tighter focal spot compared to focused plane-wave (FPW) illumination[1,2]
In this paper we extend our earlier study on the localized surface plasmon-polariton (LSP) spectra of metal NPs13 to the case of FRBs
Summary
Focused radially-polarized beams (FRBs) find application in many fields of optics. Van Enk has discussed FRBs in the context of quantum optics for efficient coupling of light to a single emitter[4]. Meixner’s group has performed a set of experiments to explore the interaction of radially-, azimuthal- and linearly-polarized focused beams with metal NPs6,7,8. A number of theoretical works have studied the interaction of tightly-focused beams with spherical NPs. Sendur et al have used diffraction integrals to analyze the near field produced by a silver NP under FPW and FRB illumination[9]. Moore and Alonso have chosen the multipole expansion approach to develop a generalized Mie theory where the incident beam is a complex focused field. We discuss these features both in the farand near-field regimes
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