Exceptional point protected robust on-chip optical logic gates.
Exceptional point protected robust on-chip optical logic gates.
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特殊点保护了强大的片上光学逻辑门。
DOI：
10.1002/exp.20210243
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Sun, Hong-Bo
中科院分区：
文献类型：
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作者：
Yang, Song-Rui;Zhang, Xu-Lin;Sun, Hong-Bo
光学逻辑门是利用光子进行信息处理和通信的关键部件。目前的光学逻辑门通常依赖于光干涉原理，这需要对光的动态相位的精确操纵，使得设备对系统干扰（例如制造误差）非常敏感。在这里，我们将非厄米原理引入到工作在信号传输过程中的光学逻辑门的设计中。我们提出了一种用于绝缘体上硅平台的异或门，采用例外点（EP）包围过程中的物理学。EP诱导的模式切换行为被应用于操纵光的相位，光的相位被EP周围的能量表面拓扑保护。其结果是，该设备的性能被发现是非常强大的结构参数干扰。所提出的非厄米原理有望在其他片上光子器件中找到高鲁棒性能的应用。非厄米物理原理被引入到片上光子器件的设计中，以实现高鲁棒性。作为概念验证，采用特殊点包围物理设计了绝缘体上硅平台上的异或门。由于例外点周围的拓扑结构对光子相位的保护，该器件的性能对结构参数的干扰非常鲁棒。
Optical logic gates are crucial components for information processing and communication using photons. Current optical logic gates typically rely on the light interference principle which requires an accurate manipulation of the dynamical phase of light, making the device quite sensitive to system disturbances such as fabrication errors. Here we introduce non‐Hermitian principles into the design of optical logic gates that work in the signal transmission process. We propose an exclusive‐or gate for silicon‐on‐insulator platform by employing the physics in the exceptional point (EP) encirclement process. The EP induced mode switching behavior is applied to manipulate the phase of light which is topologically protected by the energy surface around the EP. As a result, the performance of the device is found to be extremely robust to structural parameter disturbances. The proposed non‐Hermitian principle is expected to find applications for other on‐chip photonic devices toward high robust performance. Non‐Hermitian physical principles are introduced into the design of on‐chip photonic devices toward high robustness. As a proof‐of‐concept, an exclusive‐or gate on silicon‐on‐insulator platform is designed by employing the exceptional point encirclement physics. The device performance is extremely robust to structural parameter disturbances, owing to the protection of the photon phase by the topological structure around the exceptional point.