Nano antennas for data transfer

Science Daily  January 8, 2020 To enable antennas to operate at higher frequencies allow higher bandwidths and smaller footprints directional antennas have to be shrunk to nanometre scale. Researchers in Germany demonstrated electrically driven Yagi-Uda antennas for light with wavelength-scale footprints that exhibit large directionalities with forward-to-backward ratios of up to 9.1 dB. Light generation is achieved via antenna-enhanced inelastic tunneling of electrons over the antenna feed gap. They obtained reproducible tunnel gaps by means of feedback-controlled dielectrophoresis to precisely place single surface-passivated gold nanoparticles in the antenna gap. The resulting antennas performed equivalent to radio-frequency antennas and outperformed RF designs. […]

Analytical tool designs corkscrew-shaped nano-antennae

Science Daily  August 23, 2019 The nano corkscrews are highly sensitive to light: depending on frequency and polarisation, they can strongly enhance it. Usually, the interaction of such nano-antennas with an electromagnetic field is determined using numerical methods. Each helix geometry, however, requires a new numerically expensive calculation. Researchers in Germany have a formula that tells them how a nano-antenna with specific parameters responds to light. This analytical description can be used as a design tool, as it specifies the required geometrical parameters of a nano-helix to amplify electromagnetic fields of desired frequencies or polarisation. The research could have applications […]