High-harmonic generation from a subwavelength dielectric resonator

• DOI: 10.1126/sciadv.adg2655
• Publication Date: 2023-04-26T18:00:51Z
• Authors: Anastasiia Zalogina; Luca Carletti; Anton Rudenko; Jerome V. Moloney; Aditya Tripathi; Hoo-Cheol Lee; Ilya Shadrivov; Hong-Gyu Park; Yuri Kivshar; Sergey S. Kruk
• Keywords: Harmonic

Higher-order optical harmonics entered the realm of nanostructured solids being observed recently in gratings and metasurfaces with a subwavelength thickness. Structuring materials at scale allows us toresonantly enhance efficiency nonlinear processes reduce size high-harmonic sources. We report observation up to seventh harmonic generated from single resonator made AlGaAs material. This process is enabled by careful engineering geometry for supporting an mode associated quasi-bound state continuum mid-infrared spectral range around λ = 3.7 μm pump wavelength. The volume measures ~0.1 λ3. resonant modes are excited azimuthally polarized tightly focused beam. evaluate contributions perturbative nonperturbative nonlinearities generation process. Our work proves possibility miniaturize solid-state sources high volumes.