Intersubband transitions in n-doped semiconductor heterostructures allow one to quantum-engineer one of the largest known nonlinear response in condensed matter systems but only for the electric field polarized normal to semiconductor layer. By coupling of a quantum-engineered multi-quantum-well semiconductor layer with electromagnetically-engineered plasmonic elements we may produce ultrathin metasurfaces with giant nonlinear response. Here we experimentally demonstrate metasurfaces designed for second harmonic generation at λ≈9.9 μm with a record-high nonlinear response for condensed-matter systems in infrared/visible spectral range, up to 1.17×106 pm/V. The practical impact of the nonlinear metasurfaces proposed here may be extended to a variety of fields, including THz generation and detection, phase conjugation, and other nonlinear optical processes.
Jongwon Lee, Nishant Nookala, Juan Sebastian Gomez-Diaz, Mykhailo Tymchenko, Frederic Demmerle, Gerhard Boehm, Markus-Christian Amann, Andrea Alù, and Mikhail A. Belkin, "Highly-nonlinear quantum-engineered polaritonic metasurfaces," Proc. SPIE 9546, Active Photonic Materials VII, 95460K (Presented at SPIE Nanoscience + Engineering: August 10, 2015; Published: 31 August 2015); https://doi.org/10.1117/12.2190454.
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