Nanorod optical antennas for dipolar transitions

Abstract

Optical antennas link objects to light. Here, we analyze metal nanorod antennas as cavities with variable reflection coefficients to derive the interaction of dipolar transitions with radiation through the antenna modes. The presented analytical model accurately describes the complete emission process, and is summarized in a phase-matching equation. We show how antenna modes evolve as they become increasingly more bound, i.e. plasmonic. The results illustrate why efficient antennas should not be too plasmonic, and how subradiant even modes can evolve into weakly-interacting dark modes. Our description is valid for the interaction of nanorods with light in general, and is thus widely applicable.

10 pages, 4 figures, submitted

References in corpus (3)

• On-command enhancement of single molecule fluorescence using a gold nanoparticle as an optical nano-antenna
• Input Impedance, Nanocircuit Loading, and Radiation Tuning of Optical Nanoantennas
• Strong coupling of single emitters to surface plasmons

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