arXiv 1901.087952019-01-25physics.optics

基于Ge2Sb2Te5的法布里-珀罗腔三次谐波产生的巨大增强

Giant Enhancement of Third Harmonic Generation from Ge2Sb2Te5 based Fabry-Perot Cavity

Tun Cao, Kuan Liu, Yutao Tang, Junhong Deng, Kingfai Li, Guixin Li

摘要：

三次谐波（THG）在显微镜、光通信等领域有着重要的应用。传统的在宏观晶体中获得高效率三次谐波的方法已经成熟，但这些方法最终会限制片上激光光源的小型化和集成化。迄今为止，来自光子晶体或超材料的THG提供了紧凑的光子平台，然而材料的选择仍然难以捉摸。在这里，我们实验证明了一个巨大的提高三倍频效率从空气/高折射率Ge 2Sb 2 Te 5（GST 225）/金多层法布里-珀罗腔。在近红外区的谐振腔波长下，50 nm厚的非晶GST 225平面薄膜的三倍频效率比非谐振条件下提高了422倍。有趣的是，当GST 225的结构状态从非晶态转变为晶态时，三倍频效率急剧下降三个数量级。我们的研究结果有可能实现超紧凑的非线性光源具有高效率和可切换的功能。

英文摘要：

Third-order harmonic generation (THG) plays a vital role in microscopy, optical communications etc. Conventional methods of obtaining efficient THG in macroscopic crystal is already mature; however, they will finally limit the miniaturization and integration of on-chip laser sources. To date, THG from either photonic crystals or metamaterials provide compact photonic platforms, however selection of materials remains elusive. Herein, we experimentally demonstrate a giant enhancement of THG efficiency from an air/high index Ge2Sb2Te5 (GST225) /gold multi-layered Fabry-Perot cavity. At cavity resonant wavelength in near-infrared regime, the efficiency of THG from a 50 nm thick amorphous GST225 planar film is boosted by 422 times compared to that of nonresonant conditions. Interestingly, the THG efficiency has a dramatic decrease of three orders when the structural state of GST225 is transformed from amorphous to crystalline. Our findings have a potential for achieving ultra-compact nonlinear optical source with high efficiency and switchable functionality.

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。

摘要：

英文摘要：

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