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arXiv · 2207.09407

High harmonic generation from a subwavelength dielectric resonator

Anastasiia Zalogina·Luca Carletti·Aditya Tripathi·Hoo-Cheol Lee·Ilya Shadrivov·Hong-Gyu Park·Yuri Kivshar·Sergey Kruk
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Abstract

Higher-order optical harmonics entered the realm of nanostructured solids being observed recently in optical gratings and metasurfaces with a subwavelength thickness. Structuring materials at the subwavelength scale allows for resonant enhancing of the efficiency of nonlinear processes and reducing the size of high-harmonic sources. Here we report the observation of up to a seventh harmonic generated from a single subwavelength resonator made of AlGaAs material. This process is enabled by careful engineering of the resonator geometry for supporting optical modes associated with a quasi-bound state in the continuum in the mid-infrared spectral range at around {\lambda}=3.7 {\mu}m pump wavelength. The resonator volume measures ~ 0.1 {\lambda}^3. The resonant modes are excited with an azimuthally polarized tightly focused beam. We evaluate the contributions of perturbative and non-perturbative nonlinearities to the harmonic generation process. Our work proves the possibility to miniaturize solid-state sources of high harmonics to the subwavelength volumes.

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Anastasiia Zalogina, Luca Carletti, Aditya Tripathi, Hoo-Cheol Lee, Ilya Shadrivov, Hong-Gyu Park, Yuri Kivshar, Sergey Kruk. 2022-07-05. High harmonic generation from a subwavelength dielectric resonator. https://arxiv.org/abs/2207.09407

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