Holon Physics Seminar

Linear, Nonlinear and Quantum Optics with Plasmonic Nanoresonators
Dr. Tal Ellenbogen, Tel Aviv University

November 23, 2017 | 13:00 | Seminar Room 424/8

The enormous advancements in precise fabrication capabilities of micro- and nano-structures led to the emergence of the exciting field of nanophotonics. It is well known by now that the optical properties of nanostructured materials can be engineered and that the interaction between light and matter is strongly affected by encapsulation of photons in such structures and materials. This opens new possibilities for fundamental studies of light-matter physics which can lead to improvements of current optical technologies and developments of new optical devices. In my talk I will focus on light manipulation by metallic nanostructures which support localized surface plasmon resonances.
I will first show how surfaces which are covered by such nanoresonators, with specific geometries, show unique polarization-dependent spectral properties. For their unique optical behavior, these surfaces are also termed optical metasurfaces. I will then show how to construct new linear optical components based on these metasurfaces, specifically diffractive elements with corrected chromatic aberrations and multifunctional laser beam shapers.
After that I will describe also nonlinear quadratic effects in metasurfaces. I will show how nonlinear metasurfaces open the door to a variety of light generation and manipulation schemes and to new fundamental studies in the realm of nonlinear optics. Specifically I will present a new study on quadratic nonlinear coherent coupling due to surface lattice resonance at the second harmonic.
Finally, I will discuss the ability to modify the optical properties of metasurfaces by strongly coupling their optical modes with excitons and forming hybrid light-matter states. I will present a study on strongly coupled exciton-localized surface plasmons in metasurfaces of nanoantennas coated with molecular J-aggregates and show recent results of their ultrafast (and intriguing) temporal dynamics.