SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Focus Session: Tailored Nonlinear Photonics

HL 15.3: Hauptvortrag

Donnerstag, 30. September 2021, 11:00–11:30, H4

Quadratic nanomaterials for integrated photonic devices — •Rachel Grange — ETH Zurich, Switzerland

Nonlinear and electro-optic devices are present in our daily life with many applications: light sources for microsurgery, green laser pointers, or modulators for telecommunication. Most of them use bulk materials such as glass fibres or high-quality crystals, hardly integrable or scalable due to low signal and difficult fabrication. Generating nonlinear or electro-optic effects from materials at the nanoscale can expand the applications to biology and optoelectronics. However, the efficiency of nanostructures is low due to their small volumes. Here I will show several strategies to enhance optical signals by engineering metal-oxides at the nanoscale with the goal of developing nonlinear and electro-optic photonics devices for a broad spectral range. We use metal-oxides such as barium titanate (BTO) and lithium niobate (LNO) as an alternative platform for nanoscale nonlinear photonics. BTO and LNO are non-centrosymmetric materials with high refractive index and high energy band gaps. We already demonstrated linear Mie resonances in BTO and LNO nanostructures, such as nanospheres or nanocubes. Recently, we focused on bottom-up assemblies of BTO nanoparticles to obtain electro-optic metasurfaces and quasi phase matching effects. We measured an electro-optic response in assembled nanostructures as strong as certain other perfect crystalline structure. The field of metal-oxides at the nanoscale has a huge potential of applications in nanophotonics, integrated optics and telecommunication.