Overcoming intensity saturation in second harmonic nonlinear intersubband polaritonic metasurfaces using two-level systems

Jonas H. Krakofsky; Simon Stich; Michele Cotrufo; Ahmed Mekawy; Sander A. Mann; Anna Köninger; Gerhard Boehm; Andrea Alù; Mikhail A. Belkin

doi:10.1117/12.2650045

15 March 2023 Overcoming intensity saturation in second harmonic nonlinear intersubband polaritonic metasurfaces using two-level systems

Jonas H. Krakofsky, Simon Stich, Michele Cotrufo, Ahmed Mekawy, Sander A. Mann, Anna Köninger, Gerhard Boehm, Andrea Alù, Mikhail A. Belkin

Author Affiliations +

Proceedings Volume 12431, Photonic and Phononic Properties of Engineered Nanostructures XIII; 1243108 (2023) https://doi.org/10.1117/12.2650045
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Nonlinear metasurfaces based on coupling of intersubband transitions in n-doped semiconductor heterostructures with optical modes in nanoresonators provide the largest known second-order nonlinear response in condensed matter systems in the mid-infrared spectral range. However, these giant nonlinearities are only present at relatively low pumping intensities which limits the maximum achievable frequency conversion efficiency. We experimentally investigate a new nonlinear intersubband metasurface design for second harmonic generation based on two-level nonlinear intersubband system that provides high nonlinearity combined with significantly reduced intensity saturation compared to the intersubband metasurfaces based on three-level intersubband systems demonstrated so far.

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Jonas H. Krakofsky, Simon Stich, Michele Cotrufo, Ahmed Mekawy, Sander A. Mann, Anna Köninger, Gerhard Boehm, Andrea Alù, and Mikhail A. Belkin "Overcoming intensity saturation in second harmonic nonlinear intersubband polaritonic metasurfaces using two-level systems", Proc. SPIE 12431, Photonic and Phononic Properties of Engineered Nanostructures XIII, 1243108 (15 March 2023); https://doi.org/10.1117/12.2650045

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