Nonlinear metasurfaces enter the elusive THz regime
A new research done by Shay Keren-Zur and Mai Tal from the group of Prof. Tal Ellenbogen at the Department for Physical Electronics, in collaboration with Dr. Sharly Fleischer from the School of Chemistry, and Prof. Daniel Mittleman from Electrical Engineering at Brown University, shows that nonlinear nanostructured metasurfaces can be used for the generation and manipulation of THz radiation. Each nanoscale element on the surface acts as a nanoantenna that is excited by infrared femtosecond pulses and generates bursts of THz radiation. By controlling the symmetry and arrangement of the nanoantennas on the metasurface, it is shown that the spatial and temporal shape of the emitted THz radiation can be controlled in an unprecedented way. Due to difficulties to generate and control electromagnetic radiation in the THz band (~0.1-10THz) using existing methods, this research opens the door to a wide variety of new applications for THz radiation.
Link to a short animation on the research:
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Link to a publication on the research from Faculty of Engineering: