Nanorod optical antennas for dipolar transitions

Details Nanorod optical antennas for dipolar transitions Nanorod optical antennas for dipolar transitions

2009-12-10

arxiv.org/abs/0912.2024v1

Nano Lett., 2011, 11 (3), pp 1020-1024

Physics

Optics

10 pages, 4 figures, submitted

Scientific paper

10.1021/nl103828n

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.

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