Chinese Optics Letters, 2021, 19 (6): 060004, Published Online: Mar. 26, 2021
Efficient second harmonic generation in silicon covered lithium niobate waveguides Download: 628次
Abstract
We theoretically propose a hybrid lithium niobate (LN) thin-film waveguide that consists of an amorphous silicon stripe and etch-free z-cut LN for highly efficient wavelength conversion, circumventing the challenging etching on LN material. Profiting from the spatial symmetry breaking of the waveguide, the asymmetric hybrid modes can spontaneously achieve phase matching with small modal area and large spatial mode overlap, enabling enhanced second harmonic generation with a normalized conversion efficiency over (0.5-mm-long propagation distance). The choice of integrating silicon with LN alleviates the fabrication challenge, making the platform potentially compatible with silicon photonics.
Bin Fang, Shenglun Gao, Zhizhang Wang, Shining Zhu, Tao Li. Efficient second harmonic generation in silicon covered lithium niobate waveguides[J]. Chinese Optics Letters, 2021, 19(6): 060004.