|Abstract: ||An exemplary embodiment of the present invention is a photodetector
comprising a semiconductor body, a periodically patterned metal
nanoantenna disposed on a surface of the semiconductor body, and at least
one electrode separate from the nanoantenna. The semiconductor body
comprises an active layer in sufficient proximity to the nanoantenna for
plasmonic coupling thereto. The nanoantenna is dimensioned to absorb
electromagnetic radiation in at least some wavelengths not more than 12
.mu.m that are effective for plasmonic coupling into the active layer.
The electrode is part of an electrode arrangement for obtaining a
photovoltage or photocurrent in operation under appropriate stimulation.