CST – Computer Simulation Technology

Nano-antenna elements for controlling optical phase
Yuval Yifat, Michal Eitan, Zeev Iluz, Amir Boag, Yael Hanein, Jacob Scheuer
SPIE Proceedings - Photonic and Phononic Properties of Engineered Nanostructures IV
Volume: 8994, 19 February 2014
Nanoantenna, plasmonice structure, diffractive optical element, nanofabrication, phase control, plasmonic device, computer generated holography
We demonstrate the use of nano-antenna unit cells composed of coupled dipole and patch elements over a reflective back plane, which are designed to control the phase of a reflected optical beam. The antennas were studied both numerically and experimentally and allow exact control over the output phase in the range of 0°-360°. Several diffractive optical applications are shown numerically and experimentally: Blazed gratings which allow deflection of the output beam to high reflection angles show very high diffraction efficiency, and arbitrary wave shapes such as computer generated holograms can be formed with very high efficiency and large angles relative to the incident beam. The optical conversion efficiency was measured to be above 40% for all applications.

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