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Multistate Tuning of Third Harmonic Generation in Fano-Resonant Hybrid Dielectric Metasurfaces
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-09-17 , DOI: 10.1002/adfm.202104627
Omar A. M. Abdelraouf 1, 2 , Aravind P. Anthur 2 , Zhaogang Dong 2 , Hailong Liu 2 , Qian Wang 2 , Leonid Krivitsky 2 , Xiao Renshaw Wang 1, 3 , Qi Jie Wang 1, 3 , Hong Liu 2
Affiliation  

Hybrid dielectric metasurfaces have emerged as a promising approach to enhancing near field confinement and thus high optical nonlinearity by utilizing low loss dielectric rather than relatively high loss metallic resonators. A wider range of applications can be realized if more design dimensions can be provided from material and fabrication perspectives to allow dynamic control of light. Here, tunable third harmonic generation (THG) via hybrid metasurfaces with phase change material Ge2Sb2Te5 (GST) deposited on top of amorphous silicon metasurfaces is demonstrated. Fano resonance is excited to confine the incident light inside the hybrid metasurfaces, and an experimental quality factor (Q-factor ≈ 125) is achieved at the fundamental pump wavelength around 1210 nm. Not only the switching between a turn-on state of Fano resonance in the amorphous state of GST and a turn-off state in its crystalline state are demonstrated, but also gradual multistate tuning of THG emission at its intermediate states. A high THG conversion efficiency of η = 2.9 × 10−6% is achieved, which is 32 times more than that of a GST-based Fabry–Pèrot cavity under a similar pump laser power. Experimental results show the potential of exploring GST-based hybrid dielectric metasurfaces for tunable nonlinear optical devices.

中文翻译:

风扇谐振混合介电超表面中三次谐波产生的多态调谐

混合电介质超表面已成为一种有前途的方法,通过利用低损耗电介质而不是相对高损耗的金属谐振器来增强近场限制,从而增强光学非线性。如果可以从材料和制造的角度提供更多的设计尺寸以允许动态控制光,则可以实现更广泛的应用。在这里,展示了通过混合超表面与沉积在非晶硅超表面上的相变材料 Ge 2 Sb 2 Te 5 (GST)产生可调谐三次谐波 (THG) 。Fano共振被激发以将入射光限制在混合超表面内,并且实验品质因数(Q-因子 ≈ 125) 在 1210 nm 附近的基本泵浦波长处实现。不仅展示了 GST 非晶态下 Fano 共振的开启状态与其结晶态下的关闭状态之间的切换,而且还展示了在其中间状态下 THG 发射的逐渐多态调谐。在类似的泵浦激光功率下,实现了 η = 2.9 × 10 -6 %的高 THG 转换效率,是基于 GST 的法布里-珀罗腔的转换效率的32 倍。实验结果显示了探索用于可调非线性光学器件的基于 GST 的混合介电超表面的潜力。
更新日期:2021-11-23
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