Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: Focus Session: Tailored Nonlinear Photonics II

HL 71.2: Hauptvortrag

Donnerstag, 19. März 2020, 15:30–16:00, POT 51

Resonant nanostructured surfaces for parametric frequency conversion — •Frank Setzpfandt — Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena

Metasurfaces composed of high-refractive-index nanoparticles supporting electric and magnetic Mie-type resonances offer unique opportunities for controlling the properties of transmitted or reflected light. Recent technological advances furthermore enabled the fabrication of Mie-resonant nanoparticles from materials with strong second-order nonlinearity, like gallium arsenide and lithium niobate. Metasurfaces based on these materials are a versatile platform for efficient nonlinear frequency conversion using parametric three-wave mixing, e.g. by second-harmonic or sum-frequency generation. They enable control of emission direction and polarization of the nonlinearly generated light through the geometry of the nanoparticles. I will discuss our recent advances in understanding and controlling nonlinear frequency conversion in dielectric metasurfaces made from gallium arsenide and lithium niobate, which feature very different nonlinear properties. Alternatively, efficient frequency conversion is also possible using strong material resonances e.g. in 2D transition metal dichalcogenides, where the nonlinear susceptibility can be notably increased in the vicinity of the resonance. I will demonstrate that nanostructuring transition metal dichalcogenides also enables spatial control of second-harmonic light generated in the 2D material, without using Mie resonances.