Resonant metasurfaces are devices composed of nanostructured subwavelength scatterers that support narrow optical resonances, enabling applications in filtering, nonlinear optics, and molecular fingerprinting. It is highly desirable for these applications to incorporate such devices with multiple high-quality-factor (high-Q) resonances; however, it can be challenging to obtain more than a handful of narrow resonances in a metasurface. This challenge is compounded when choosing to use plasmonic materials, which are known to provide strong sub-diffraction limited light confinement as well as large nonlinearities, but at the cost of significant absorptive losses.
In this webinar hosted by the OSA Photonic Metamaterials Technical Group, Dr. Orad Reshef will focus on resonant plasmonic metasurfaces based on surface lattice resonances, and on advances made by the CERC group at the University of Ottawa in these platforms towards obtaining strong metasurface-based optical nonlinearities. When arranged in a periodic lattice, individual plasmonic nanoparticle resonances combine to form collective oscillations with very high Q-factors, orders of magnitude larger than what is typically achievable with individual plasmonic nanoparticles. The combination of the strong nonlinearity of the metal with these high Q-factors makes periodic gold nanoparticle arrays into promising candidates for efficient nonlinear interactions within ultra-thin propagation lengths.
What You Will Learn:
• Metasurface-enhanced optical nonlinearity
Who Should Attend: