סמינר זה יחשב כסמינר שמיעה לתלמידי תואר שני--
You are invited to attend a lecture on Tuesday, February 8th at 11:00
Zoom Seminar
Diffractive Focusing and Guiding, Dynamic Control and Sorting of Propagating Surface Plasmon Polaritons
By:
Dror Weisman
Ph.D. student under the supervision of Prof. Ady Arie
Abstract
Surface Plasmon Polaritons are electromagnetic surface waves propagating at the interface between a metal and a dielectric, that are coupled to collective charge oscillations inside the metal. The ability to confine electromagnetic waves to dimensions that are much smaller than the optical wavelength is very attractive for numerous applications: on-chip communication, sensing, light matter interactions, optical trapping, and more. In this seminar, I will show how to expand the toolbox for designing photonic and plasmonic devices.
The ability to actively control the plasmonic wavefront as it propagates on the surface of a chip is presented. The thermo-optic effect is applied for selectively controlling the accumulated phase of the plasmonic wavefront. In addition, a compact device, with micrometer footprint and nanometric thickness is demonstrated, that enables to route and sort different planar beams to different directions.
Plasmonic beams can also be treated as two dimensional (2D) waves, since they are highly confined to the surface. Taking advantage of this property allowed us to use plasmonic beams for exploring general wave phenomena such as diffractive focusing and diffractive guiding. We investigated the counter-intuitive effect of diffractive focusing, where a plane wave passing through a slit is first focused and only then it expands. Then, based on the same effect, we demonstrated that by cascading several slits, a plasmonic waveguide is formed. This guiding concept is applicable for a wide variety of waves.
