OSE Seminars
Dielectric Resonator Metasurfaces: Optical Magnetism, Wavefront Control and Optical Nonlinearities
Presented by Dr. Igal Brener Sandia, National Laboratories and Center for Integrated Nanotechnologies
Metamaterials have been used extensively for wavefront manipulation since their inception more than a decade ago. This has led to a new paradigm in optics with the ability to design optical components with functionality that was unthinkable not long ago. Although magnetic and electric optical resonances of Mie scatterers have been known for more than a century, it is only recently that these particles (dielectric resonators-DR) have been utilized for the realization of low loss metamaterials at optical frequencies. I will describe several examples of passive 2D metamaterials (or metasurfaces) with quite peculiar behavior such as optical magnetic mirrors, Huygens metasurfaces and holograms.
The ability to tailor also the local near fields inside the constituent material of the DRs has implications for other optical behavior such as the nonlinear optical response. When all dielectric metasurfaces are created from materials with inherent high optical nonlinearities, this combination yields some surprising results. In this talk I will also describe new developments in the nonlinear optical response of metasurfaces when these are made from direct bandgap semiconductors. In combination with short pulse excitation using single and multiple pulses, we observe multiple harmonic mixing spanning a wavelength range from the near infrared to the ultraviolet. Additionally, the use of direct bandgap semiconductors as the constituent material for these all-dielectric metasurfaces enables the possibility for a new class of all optical switching devices that can potentially use lower energy than existing counterparts.
11:00 am, Wednesday, January 24, 2018
PAIS-2540, PAIS
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