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Tailoring optical nonlinear effects (e.g. harmonic generation, sum-frequencymixing, etc.) in the recently emerging all-dielectric platform is important forboth the fundamental science and industrial development of high-efficiency,ultrafast, and miniaturized photonic devices. In this work, we propose a novelparadigm for dynamically switchable high-harmonic generation in Siliconnanodimer metasurfaces by exploiting polarization-controlled dual bound statesin the continuum (BIC). Owing to the high-quality factor of BIC resonances,efficient harmonic signals including the third-harmonic generation andfifth-harmonic generation from a direct process as well as a cascaded processby degenerate four-wave mixing are obtained. Moreover, the BICs and theirresonantly enhanced harmonics can be switched on or off with high selectivityrespect to the fundamental pump polarization. Compared with previous reports,our work provide a simple but effective tuning strategy by fully exploring thestructural symmetry and polarization degree of freedom rather than resorting toadditional external stimuli, which would have great advantages in smartdesigning tunable and switchable nonlinear light source for chip-scaleapplications.

physical review. b./physical review. b

Polarization-controlled dynamically switchable high-harmonic generation  from all-dielectric metasurfaces governed by dual bound states in the  continuum