Various aspects of the present invention are directed to a nanowire configured to couple electromagnetic radiation to a selected guided wave and devices incorporating such nanowires. In one aspect of the present invention, a nanowire structure includes a substrate and at least one nanowire attached to the substrate. A diameter, composition, or both may vary generally periodically along a length of the at least one nanowire. A coating may cover at least part of a circumferential surface of the at least one nanowire. The nanowire structure may be incorporated in a device including at least one optical-to-electrical converter operable to convert a guided wave propagating along the length of the at least one nanowire, at least in part responsive to irradiation, to an electrical signal. Other aspects of the present invention are directed to methods of fabricating nanowires structured to support guided waves.

 
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