We introduce ABC laminate metamaterials composed of layers of three different dielectrics. Each layer has zero bulk second-order optical nonlinearity, yet centro-symmetry is broken locally at each inner interface. To achieve appreciable effective bulk metamaterial second-order nonlinear optical susceptibilities, we densely pack many inner surfaces to a stack of atomically thin layers grown by conformal atomic-layer deposition. For the ABC stack, centro-symmetry is also broken macroscopically. Our experimental results for excitation at around 800 nm wavelength indicate interesting application perspectives for frequency conversion or electro-optic modulation in silicon photonics.
Luca Alloatti, Clemens M. Kieninger, Andreas M. Frölich, Matthias Lauermann, Tobias Frenzel, Kira Köhnle, Wolfgang Freude, Juerg Leuthold, Christian Koos, and Martin Wegener, "Second-harmonic generation from atomic-scale ABC-type laminate optical metamaterials (Presentation Recording)," Proc. SPIE 9544, Metamaterials, Metadevices, and Metasystems 2015, 95440Y (Presented at SPIE Nanoscience + Engineering: August 10, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2187154.4519316142001.
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