Abstract
Second Harmonic Generation In article number 2100409, Lei Wang, Xiuquan Zhang, and Feng Chen demonstrate efficient second harmonic generation via modal phase matching in a dual-layer thin-film lithium niobate on insulator (LNOI) nanophotonic waveguide. The novel thin-film lithium niobate consists of two layers of x-cut LiNbO3, and their polarizations are antiparallel. Conversion efficiency up to 5540% W-1cm-2 has been achieved in waveguides under optical excitation at fundamental wavelength of ∼1.5 μm.
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