Control of second-harmonic generation in all-dielectric intersubband metasurfaces by controlling the polarity of?(2)

Year: 2022

Authors: Sarma R., Xu JM., De Ceglia D., Carletti L., Klem J., Belkin MA., Brener I.

Autors Affiliation: Sandia Natl Labs, Albuquerque, NM 87123 USA; Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87123 USA; Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA; Univ Brescia, Dept Informat Engn, I-25121 Brescia, Italy; Univ Brescia, INO CNR, I-25121 Brescia, Italy; Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany.

Abstract: All-dielectric metasurfaces have recently led to a paradigm shift in nonlinear optics as they allow for circumventing the phase matching constraints of bulk crystals and offer high nonlinear conversion efficiencies when normalized by the light-matter interaction volume. Unlike bulk crystals, in all-dielectric metasurfaces nonlinear conversion efficiencies primarily rely on the material nonlinearity, field enhancements, and the modal overlaps, therefore most efforts to date have only focused on utilizing these degrees of freedom. In this work, we demonstrate that for second-harmonic generation in all-dielectric metasurfaces, an additional degree of freedom is the control of the polarity of the nonlinear susceptibility. We demonstrate that semiconductor heterostructures that support resonant nonlinearities based on quantum-engineered intersubband transitions provide this new degree of freedom. We can flip and control the polarity of the nonlinear susceptibility of the dielectric medium along the growth direction and couple it to the Mie-type photonic modes. Here we demonstrate that engineering the chi((2)) polarity in the meta-atom enables the control of the second-harmonic radiation pattern and conversion efficiency. Our results therefore open a new direction for engineering and optimizing second-harmonic generation using all-dielectric intersubband nonlinear metasurfaces.(c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 30 (19)      Pages from: 34533  to: 34544

More Information: Basic Energy Sciences; Defense Advanced Research Projects Agency; Ministero dell’Istruzione,dell’Universita e della Ricerca.
KeyWords: Harmonic-generation
DOI: 10.1364/OE.468709

Citations: 4
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