Strongly Enhanced Second Harmonic Generation in a Thin Film Lithium Niobate Heterostructure Cavity,Physical Review Letters

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Strongly Enhanced Second Harmonic Generation in a Thin Film Lithium Niobate Heterostructure Cavity
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-06 , DOI: 10.1103/physrevlett.127.153901
Shuai Yuan ₁ , Yunkun Wu _{2,

3} , Zhongzhou Dang ₁ , Cheng Zeng ₁ , Xiaozhuo Qi _{2,

3} , Guangcan Guo _{2,

3} , Xifeng Ren _{2,

3} , Jinsong Xia ₁

Affiliation

Boosting second-order optical nonlinear frequency conversion over subwavelength thickness has long been pursued through optical resonance in micro- and nanophotonics. However, the availability of thin film materials with high second-order nonlinearity is limited to III-V semiconductors, which have low transparency in the visible. Here, we experimentally demonstrated strongly enhanced second harmonic generation in one-dimensional heterostructure cavities on thin film lithium niobate. A guided-mode resonance resonator and distributed Bragg reflectors are combined for both efficient coupling and electromagnetic field localization. Over 1200 times second harmonic generation enhancement is experimentally realized compared with flat thin film lithium niobate through optimizing the trade-off between quality factor and mode volume, leading to a record high normalized conversion efficiency of

2.0 3 \times 10^{- 5} {cm}^{2} / GW

under

1.92 MW / {cm}^{2}

pump intensity. Our approach could inspire the miniaturization and integration of compact resonant nonlinear photonic devices on thin film lithium niobate.

中文翻译：

薄膜铌酸锂异质结构腔中强烈增强的二次谐波产生

长期以来，人们一直在通过微米和纳米光子学中的光学共振来促进亚波长厚度上的二阶光学非线性频率转换。然而，具有高二阶非线性的薄膜材料的可用性仅限于 III-V 族半导体，其在可见光中的透明度较低。在这里，我们通过实验证明在铌酸锂薄膜上的一维异质结构腔中产生强烈增强的二次谐波。导模谐振谐振器和分布式布拉格反射器相结合，以实现高效耦合和电磁场定位。通过优化品质因数和模式体积之间的权衡，实验实现了与扁平薄膜铌酸锂相比二次谐波产生增强超过 1200 倍，