Optical antennas for enhanced light absorption and emission

摘要

'Antennas' are a well-established concept in the radiowave and microwave regime, but they are conspicuously absent in optical, infrared, and even terahertz technologies. The absence of optical antennas in technological applications is primarily associated with their small scale. Antennas have characteristic dimensions on the order of a wavelength, demanding fabrication accuracies better than 10nm for the optical frequency regime.