阿联酋阿布扎比纽约大学Mahmoud Rasras团队研究了集成二维CuCrP₂S₆的硅光子谐振腔在短波红外下的非互易响应。相关论文于2025年4月9日发表在《光：科学与应用》杂志上。

长期以来，在集成光子学中高效实现非互易光学行为一直是一个挑战。研究组通过将多层2D CuCrP₂S₆（CCPS）集成到硅微环谐振器（MRR）上来演示非互易磁光响应。在外加磁场下，CCPS层内铁磁有序以易平面磁晶各向异性为特征，在顺时针（CW）和逆时针（CCW）光传播方向上引起不对称模态响应。所提出的配置实现了0.15dB至1.8dB的低插入损耗和1550nm处28dB的高隔离比。

值得注意的是，它在反向传播方向之间表现出0.4nm的显著共振波长分裂，支持50GHz的光带宽。它直接在横向电（TE）模式下运行，与硅光子电路中使用的主偏振对齐，消除了对额外偏振管理的需要。该器件超紧凑，2D薄片相互作用长度为22µm至55µm，厚度为39 nm至62 nm。其工作范围覆盖整个C波段，带宽高达100 nm。这些特性使该混合CCPS/Si器件成为短波红外（SWIR）光谱中高级非互易光学应用的理想选择，这对于增强光学系统对背反射的弹性至关重要。

附：英文原文

Title: Non-reciprocal response in silicon photonic resonators integrated with 2D CuCrP2S6 at short-wave infrared

Author: Dushaq, Ghada, Serunjogi, Solomon, Tamalampudi, Srinivasa R., Rasras, Mahmoud

Issue&Volume: 2025-04-09

Abstract: Achieving non-reciprocal optical behavior in integrated photonics with high efficiency has long been a challenge. Here, we demonstrate a non-reciprocal magneto-optic response by integrating multilayer 2D CuCrP2S6 (CCPS) onto silicon microring resonators (MRRs). Under an applied magnetic field, the CCPS intralayer ferromagnetic ordering, characterized by easy-plane magneto-crystalline anisotropy, induces asymmetrical modal responses in the clockwise (CW) and counterclockwise (CCW) light propagation directions. The proposed configuration achieves a low insertion loss ranging from 0.15dB to 1.8dB and a high isolation ratio of 28dB at 1550nm. Notably, it exhibits a significant resonance wavelength splitting of 0.4nm between the counter propagation directions, supporting a 50GHz optical bandwidth. Operating directly in the transverse electric (TE) mode, it aligns with the main polarization used in silicon photonics circuits, eliminating the need for additional polarization management. The device is ultra-compact, with a 2D flake interaction length ranging from 22μm to 55μm and a thickness between 39nm and 62nm. Its operation range covers the entire C-band with a bandwidth of up to 100nm. These attributes make our hybrid CCPS/Si device ideal for advanced non-reciprocal optical applications in the short-wave infrared (SWIR) spectrum, crucial for enhancing the resilience of optical systems against back-reflections.

DOI: 10.1038/s41377-025-01826-w

Source: https://www.nature.com/articles/s41377-025-01826-w