Enhancing Weak Optical Signals Using a Plasmonic Yagi—Uda Nanoantenna Array

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Abstract
Nanoantennas have been used in a wide range of applications in sensing, spectroscopy, and imaging-in general, the antennas can enhance physical phenomena such as the local electric field or concentrate light in a certain direction. We have fabricated an array of 80 plasmonic Yagi-Uda nanoantennas on the cladding of an optical fiber and, by doing this, we show that the signal reaching the fast detector can be increased by a factor of 5 dB. The experiment demonstrates that plasmonic directive nanoantennas can indeed collect and concentrate electromagnetic radiation along a certain direction and eventually could be used to enhance weak signals.
Funding Information
  • Australian National Fabrication Facility for the fabrication of Yagi-Uda nanoantennas
  • University Post-Doctoral Research Fellowship Scheme, University of Western Australia, Crawley, WA, Australia

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