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arXiv 2204.04870physics.optics
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绝缘体上锗中可见光到电信波段的二次谐波产生

Second-harmonic generation in germanium-on-insulator from visible to telecom wavelengths

Yadong Wang, Daniel Burt, Kunze Lu, Donguk Nam

摘要:

二阶$χ^{2}$过程是经典和量子光学领域中许多重要的非线性光学应用的基础。通常,当由强光场驱动时,$χ^{2}$过程仅在非中心对称的电介质中经由非谐电子振荡来显现自身。由于反转对称性,IV族半导体如硅(Si)和锗(Ge)传统上不被认为是二阶非线性光学应用的理想候选物。在这里,我们报告的实验观察的二次谐波产生(SHG)在绝缘体上的锗(GOI)样品下飞秒光泵浦。特别地,我们首次报道了利用$\sim$ $3000$ nm泵浦,从电信S波段的GOI样品中测量到的倍频信号。

英文摘要:

The second-order $χ^{2}$ process underpins many important nonlinear optical applications in the field of classical and quantum optics. Generally, the $χ^{2}$ process manifests itself only in a non-centrosymmetric dielectric medium via an anharmonic electron oscillation when driven by an intense optical field. Due to inversion symmetry, group-IV semiconductors like silicon (Si) and germanium (Ge) are traditionally not considered as ideal candidates for second-order nonlinear optics applications. Here, we report the experimental observation of the second-harmonic generation (SHG) in a Ge-on-insulator (GOI) sample under femtosecond optical pumping. Specially, we report the first-time measurement of the SHG signal from a GOI sample in the telecom S-band by pumping at $\sim$$3000$ nm.

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