24/12/16 Doron Bar Lev
Doron Bar-Lev
(PhD student under the supervision of Prof. Jacob Scheuer)
School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel
Plasmonic Metasurfaces Applications for Manipulation of Optical Radiation
Surface plasmons modes are characterized by a propagating or a localized behavior, leading to a variety of unique phenomena, particularly enhanced near field intensities at sub-wavelength dimensions. The intense and localized field can be harnessed to increase the sensitivity and performance of numerous phenomena and applications. Moreover, introduction of carefully designed sub-wavelength patterns to the surface, form a plasmonic metasurface that can shape the amplitude, phase and polarization of the electromagnetic (EM) field in the vicinity of the structure, thus offering a new paradigm for manipulation and control of optical radiation.
In this talk the unique nature of plasmonic waves and metausrfaces will be discussed leading to two new applications: 1) extremely efficient laser-driven particle accelerators and 2) generation and dynamic control of arbitrary plasmonic wave-fronts using simple and static plasmonic surfaces. The first application demonstrates the opportunity of using a plasmonic metasurface to tailor the EM field in its vicinity, particularly for particle beam manipulation. I will present general design rules for plasmonic metasurface laser-driven accelerators (MLAs) and a specific structure for efficient acceleration of relativistic particles. The presented MLA attains a huge acceleration gradient of 11.6GV/m at 16fsec operation. This value is almost four times larger than that of contemporary short pulse laser accelerators and two orders of magnitude larger than that of contemporary radio-frequency based accelerators. The second application will refer to the reciprocal process in which manipulations on the surrounding EM field affects the generated plasmonic waves. Here, I will show that by tailoring the exciting beam incident on a simple and static one-dimensional metallic grating, efficient generation and dynamic control of practically every possible arbitrary plasmonic wave-front is achievable. A complete and rigorous theory will be presented and demonstrated, leading to a general design formalism for generating arbitrary plasmonic wave fronts. Finally, using this formalism I will demonstrate excitation of optically controlled surface plasmon hotspots that can lead to exciting new applications as dark field plasmonic microscopy and surface optical tweezers.
Thursday, December 24, 2015, at 10:00
Room 011, Kitot building
