发表机构
University of Maryland, College Park; Institute for Research in Electronics and Applied Physics, University of Maryland; University of Pittsburgh（马里兰大学帕克分校; 马里兰大学电子与应用物理研究所; 匹兹堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究首次在4K至300K范围内表征了集成在硅光子平台上的Sb2Se3相变材料，发现其热光系数随冷却减小而光学衰减变化微弱，且材料在热循环下稳定，为低温非易失性光子存储提供了关键参数。
AI 中文摘要
相变材料（PCM）通过晶态与非晶态之间巨大的折射率和消光系数对比，能够实现非易失性光学存储。其中，$\mathrm{Sb}_{2}\mathrm{Se}_{3}$在电信波长下具有低光学衰减，使其有望用于低损耗可编程移相器。其非易失性对于低温系统尤为有用，因为在低温系统中功耗和热负载限制了可扩展性。然而，其在低温下的光学性质仍鲜为人知。在此，我们报告了在4K至300K温度范围内，集成在代工硅光子平台上的$\mathrm{Sb}_{2}\mathrm{Se}_{3}$在晶态和非晶态下的首次低温光学表征。我们观察到，随着冷却，热光系数的幅度减小，而晶态和非晶态的光学衰减变化均很微弱。我们报告了材料在反复热循环下的稳定性。这些测量提供了设计用于可扩展低温信息处理的低损耗、非易失性光子存储元件所需的材料参数和稳定性。
英文摘要
Phase change materials (PCMs) can enable non-volatile optical memory through the large refractive index and extinction coefficient contrast between crystalline and amorphous states. Among them, $\mathrm{Sb}_{2}\mathrm{Se}_{3}$ combines low optical attenuation at telecom wavelengths, making it promising for low-loss programmable phase shifters. Its non-volatility is particularly useful for cryogenic systems, where power dissipation and thermal load constrain scalability. However, its optical properties at cryogenic temperatures remains poorly understood. Here, we report the first cryogenic optical characterization of $\mathrm{Sb}_{2}\mathrm{Se}_{3}$ integrated on a foundry silicon photonic platform from 4K to 300K for both crystalline and amorphous states. We observe that the magnitude of the thermo-optic coefficient decreases upon cooling, whereas the optical attenuation changes only weakly for both the amorphous and crystalline phases. We report the stability of the material upon repeated thermal cycling. These measurements provide the material parameters and stability required to design low-loss, non-volatile photonic memory elements for scalable cryogenic information processing.
Comments17 pages, 10 figures
