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We suggest a broadband optical unidirectional arrayed nanoantenna consisting of equally spaced nanorods of gradually varying length. Each nanorod can be driven by near‐field quantum emitters radiating at different frequencies or, according to the reciprocity principle, by an incident light at the same frequency. Broadband unidirectional emission and reception characteristics of the nanoantenna open up novel opportunities for subwavelength light manipulation and quantum communication, as well as for enhancing the performance of photoactive devices such as photovoltaic detectors, light‐emitting diodes, and solar cells. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

An arrayed nanoantenna for broadband light emission and detection