Journal
SCIENCE
Volume 332, Issue 6030, Pages 702-704Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1203056
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Funding
- NSF
- U.S. Department of Defense [N00244-09-1-0067]
- Robert A. Welch Foundation [C-1220, C-1222]
- Office of Naval Research [N00014-10-1-0989]
- Air Force Office of Scientific Research [F49620-03-C-0068]
- U.S. Department of Energy
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Nanoantennas are key optical components for light harvesting; photodiodes convert light into a current of electrons for photodetection. We show that these two distinct, independent functions can be combined into the same structure. Photons coupled into a metallic nanoantenna excite resonant plasmons, which decay into energetic, hot electrons injected over a potential barrier at the nanoantenna-semiconductor interface, resulting in a photocurrent. This dual-function structure is a highly compact, wavelength-resonant, and polarization-specific tight detector, with a spectral response extending to energies well below the semiconductor band edge.
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