在莫尔晶格边缘观察到的线性和非线性光局域化
Observation of linear and nonlinear light localization at the edges of moiré lattices
AI总结：
本研究首次在光子系统中实验观察了截断莫尔晶格边缘和角落的线性与非线性光局域化现象，发现角落模式与体激发的局域化性质差异显著，并揭示了非线性下从准局域态到表面孤子的转变。
摘要：
我们观察了在截断莫尔晶格边缘和角落的线性和非线性光局域化，该晶格由周期性互扭的毕达哥拉斯角度方形子晶格叠加形成。在飞秒激光刻写的莫尔晶格中实验激发角落线性模式时，我们发现其局域化性质与体激发相比存在显著差异。我们还探讨了非线性对角落和体模式的影响，并实验观察了从线性准局域态到在高输入功率下出现的表面孤子的转变。我们的结果构成了光子系统中由周期性莫尔结构截断诱导的局域化现象的首次实验证明。
英文摘要：
We observe linear and nonlinear light localization at the edges and in the corners of truncated moiré lattices created by the superposition of periodic mutually-twisted at Pythagorean angles square sublattices. Experimentally exciting corner linear modes in the fs-laser written moiré lattices we find drastic differences in their localization properties in comparison with the bulk excitations. We also address the impact of nonlinearity on the corner and bulk modes and experimentally observe the crossover from linear quasi-localized states to the surface solitons emerging at the higher input powers. Our results constitute the first experimental demonstration of localization phenomena induced by truncation of periodic moiré structures in photonic systems.
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