Highly Efficient Nonlinear Optical Conversion in Waveguiding GaSe Nanoribbons with Pump Pulses Down to a Femto‐Joule Level,Advanced Optical Materials

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Highly Efficient Nonlinear Optical Conversion in Waveguiding GaSe Nanoribbons with Pump Pulses Down to a Femto‐Joule Level
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-02 , DOI: 10.1002/adom.201701012
Feng Liao ₁ , Yu Wang ₁ , Tao Peng ₁ , Jian Peng ₁ , Zhaoqi Gu ₁ , Huakang Yu ₂ , Tao Chen ₃ , Jiaxin Yu ₁ , Fuxing Gu ₁

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Layered GaSe flakes have revealed strongest second‐harmonic (SH) generation among all the two‐dimensional (2D) atomic crystals measured up to now. However, the unique feature of physical atomic thickness at nanometer scale prevents their practical applications in efficient nonlinear optical conversion due to limited light–matter interaction length. In this work, high quality single‐crystal GaSe nanoribbons (NRs) are fabricated and demonstrated as waveguides with good performance. By taking advantage of the strong confinement and long interaction length of the waveguiding approach, significantly enhanced nonlinear light–matter interaction is observed in GaSe NRs. Based on transverse SH generation, a single GaSe NR‐configured optical auto‐correlator is constructed for ultrashort pulse characterization. Because of the large second‐order nonlinear susceptibility, high sensitivity down to few femto‐joule (fJ) is realized. To the best of our knowledge, this is the highest energy sensitivity among the reported nanoscale auto‐correlators. Such NR waveguides and devices are highly compatible with standard optical fiber systems. The presented results may enable the construction of future energy efficient nonlinear photonic circuitry, chips, and devices.

中文翻译：

波导GaSe纳米带中的高效非线性光学转换，泵浦脉冲降低至毫微微焦耳水平

到目前为止，在所有二维（2D）原子晶体中，层状GaSe薄片显示出最强的第二谐波（SH）生成。然而，由于光-物质相互作用的长度有限，纳米级物理原子厚度的独特特征阻止了它们在有效的非线性光学转换中的实际应用。在这项工作中，制造了高质量的单晶GaSe纳米带（NRs），并被证明是具有良好性能的波导。通过利用波导方法的强限制和长相互作用长度，GaSe NRs中观察到了显着增强的非线性光-物质相互作用。基于横向SH生成，构建了单个GaSe NR配置的光学自相关器，用于超短脉冲表征。由于较大的二阶非线性磁化率，因此实现了几毫微微焦耳（fJ）的高灵敏度。据我们所知，这是已报道的纳米级自相关器中最高的能量敏感性。这样的NR波导和设备与标准光纤系统高度兼容。呈现的结果可以使得能够构建未来的能量高效的非线性光子电路，芯片和器件。

更新日期：2018-01-02

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