Maria del Rocio Camacho Moraleshttps://orcid.org/0000-0002-6102-7157,1 Lei Xu,2 Haizhong Zhang,3 Son Tung Ha,3 Leonid A. Krivitskiy,3 Arseniy I. Kuznetsov,3 Mohsen Rahmani,2 Dragomir N. Neshev1
1The Australian National Univ. (Australia) 2Nottingham Trent Univ. (United Kingdom) 3A*STAR Agency for Science, Technology and Research (Singapore)
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We study the nonlinear optical up-conversion of doubly resonant GaP metasurfaces based on bound state in the continuum (BIC) resonances driven by leaky-waveguide modes. The fabricated metasurface is simultaneously illuminated by two excitation beams, pump and signals beams, exciting transverse-electric and -magnetic waveguide modes. The nonlinear mixing of these modes results in generation of strong sum-frequency emission in the visible spectrum. We observe a non-trivial dependence of the sum-frequency emission with the polarization of the pump beam, explained by the excitation of multipoles at the SFG wavelength. A normalized conversion efficiency of 3.5 × 10-5 [W-1] is measured in the forward direction.
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Maria del Rocio Camacho Morales, Lei Xu, Haizhong Zhang, Son Tung Ha, Leonid A. Krivitskiy, Arseniy I. Kuznetsov, Mohsen Rahmani, Dragomir N. Neshev, "Nonlinear frequency-mixing in high-Q GaP metasurfaces (Conference Presentation)," Proc. SPIE PC12195, Metamaterials, Metadevices, and Metasystems 2022, PC121950T (3 October 2022); https://doi.org/10.1117/12.2631743