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arXiv 2108.11047physics.opticsphysics.app-ph
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反极化双层晶体薄膜纳米光子波导中的超高效率二次谐波产生

Ultrahigh-Efficiency Second Harmonic Generation in a Reverse-Polarization Dual-Layer Crystalline Thin Film Nanophotonic Waveguide

Lei Wang, XiuQuan Zhang, Feng Chen

摘要:

二次谐波产生(SHG)作为最重要的\c{hi}(2)非线性光学过程之一,在各种光学和光子学应用中起着至关重要的作用。设计各种精细的倍频方案实现高效率的倍频已经成为非线性光学领域一个长期而富有挑战性的课题。尽管基于双折射相位匹配和准相位匹配的倍频技术已经取得了许多成功,但到目前为止,用于严格光限制结构中倍频的模式相位匹配(MPM)技术还处于起步阶段。在这里,我们提出了一种新的方案,通过使用纳米光子LiNbO 3薄膜波导由两个键合层与内部反转的偏振,通过MPM实现高效的SHG。在这种双层脊形波导中,当1574.6 nm光激发时,我们观察到787.3 nm的倍频,倍频转换效率为5,540% /W/cm/cm。这一工作推进了我们对模式相位匹配倍频和其他二次光学非线性过程的理解,为在片上平台上开发高性能非线性光子器件提供了额外的策略。

英文摘要:

Second harmonic generation (SHG), as one of the most significant \c{hi}(2) nonlinear optical processes, plays crucial roles in a broad variety of optical and photonic applications. Designing various delicate schemes to achieve highly efficient SHG has become a long standing and challenging topic in field of nonlinear optics. Despite numerous success on SHG based on birefringent phase matching and quasi-phase matching, so far, modal phase matching (MPM) for SHG in tightly light-confined structures has still in its infancy. Here, we propose a new scheme to realize highly-efficient SHG via MPM by using a nanophotonic LiNbO3 thin-film waveguide consists of two bonded layers with internally reversed polarizations. In such a dual-layer ridge waveguide based on lithium niobate on insulator, upon optical excitation at 1574.6 nm, we observe SHG at 787.3 nm with ultrahigh conversion efficiency of 5,540% /W/cm/cm experimentally. This work advances our understanding on modal-phase-matched SHG and other quadratic optical nonlinear process, offering additional strategies for development of high-performance nonlinear photonic devices in on-chip platforms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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