眶间耦合的实验观测
Experimental observation of inter-orbital coupling
摘要：
轨道间耦合是指通过正交非相互作用模式激发轨道态的可能性，这是光子晶格中由于固有传播常数失谐而禁止的过程。在这项工作中，使用飞秒激光写入技术，我们实验证明，基本和激发轨道状态可以相互耦合时，位于不同的空间位置。我们执行一个完整的表征的非对称双阱的潜力，并实现扫描方法，以有效地映射沿传播坐标的动态。我们的基本观察也构成了空间模式转换器器件的直接解决方案，该器件可以位于光子玻璃芯片内的任何位置。通过利用高阶光子模的相位结构和产生的有效负耦合，我们提出了一种三聚体结构作为相位分束器（$π$ -BS），这可能是非常相关的复用和基于干涉的光子级联操作。
英文摘要：
Inter-orbital coupling refers to the possibility of exciting orbital states by otherwise orthogonal non-interacting modes, a forbidden process in photonic lattices due to an intrinsic propagation constant detuning. In this work, using a femtosecond laser writing technique, we experimentally demonstrate that fundamental and excited orbital states can couple each other when located at different spatial positions. We perform a full characterization of an asymmetric double-well like potential and implement a scan method to effectively map the dynamics along the propagation coordinate. Our fundamental observation constitutes also a direct solution for a spatial mode converter device, which could be located in any position inside a photonic glass chip. By taking advantage of the phase structure of higher-order photonic modes and the effective negative coupling generated, we propose a trimer configuration as a phase beam splitter ($π$-BS), which could be of great relevance for multiplexing and interference-based photonic concatenated operations.
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