Letter abstract

Nature Photonics 4, 312 - 315 (2010)
Published online: 14 March 2010 | doi:10.1038/nphoton.2010.34

Subject Categories: Plasmonics | Imaging and sensing | Nanophotonics

Directional control of light by a nano-optical Yagi–Uda antenna

Terukazu Kosako1, Yutaka Kadoya1 & Holger F. Hofmann1

The plasmon resonance of metal nanoparticles can direct light from optical emitters in much the same way that radiofrequency antennas direct the emission from electrical circuits. Recently, rapid progress has been made in the realization of single-element antennas for optical waves1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Because most of these devices are designed to optimize the local near-field coupling between the antenna and an emitter, the possibility of modifying the spatial radiation pattern has not yet received as much attention13, 14. In the radiofrequency regime, a typical antenna design for high directivity is the Yagi–Uda antenna, which essentially consists of a one-dimensional array of antenna elements driven by a single feed element. By fabricating a corresponding array of nanoparticles, similar radiation patterns can be obtained in the optical regime15, 16, 17, 18. Here, we present the experimental demonstration of directional control of radiation from a nano-optical Yagi–Uda antenna composed of appropriately tuned gold nanorods.

  1. Graduate School of Advanced Sciences of Matter, Hiroshima University, Kagamiyama 1-3-1, Higashihiroshima 739-8530, Japan

Correspondence to: Yutaka Kadoya1 e-mail: kd@hiroshima-u.ac.jp


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