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arXiv · 1911.06373

Quasinormal-mode modeling and design in nonlinear nano-optics

Carlo Gigli·Tong Wu·Giuseppe Marino·Adrien Borne·Giuseppe Leo·Philippe Lalanne
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Abstract

Based on quasinormal-mode theory, we propose a novel approach enabling a deep analytical insight into the multi-parameter design and optimization of nonlinear photonic structures at subwavelength scale. A key distinction of our method from previous formulations relying on multipolar Mie-scattering expansions is that it directly exploits the natural resonant modes of the nanostructures, which provide the field enhancement to achieve significant nonlinear efficiency. Thanks to closed-form expression for the nonlinear overlap integral between the interacting modes, we illustrate the potential of our method with a two-order-of-magnitude boost of second harmonic generation in a semiconductor nanostructure, by engineering both the sign of $\chi^{(2)}$ at subwavelength scale and the structure of the pump beam.

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Carlo Gigli, Tong Wu, Giuseppe Marino, Adrien Borne, Giuseppe Leo, Philippe Lalanne. 2019-11-14. Quasinormal-mode modeling and design in nonlinear nano-optics. https://doi.org/10.1021/acsphotonics.0c00014

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