用于损耗型集成光子器件的相变材料评价标准和设计策略

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中文摘要：相变材料(PCM)具有优异的光学性质,在多种集成光子器件中极具应用前景,如光存储器、光开关和光神经形态计算器件.然而,由于集成光子器件相变材料光学性能评价标准的缺乏,新型相变材料的设计主要依赖于研究者的研究经验.本文基于相变光子器件的性能需求,引入材料品质因子(FOM2=△k/kamor)来评价相变材料的光学性能,建立了针对损耗调制型相变光子器件相变材料的光学性能评价标准.FOM值的大小代表相变材料在构建高性能相变光子器件中的应用潜力,FOM值越大,相变材料应用于光子器件的限制就越小.在此基础上,本文基于光学带隙理论,建立了相变材料光学参数与FOM值之间的关系,开发了三种基于GST的新型光学相变材料.结果表明,氮等非金属元素掺杂可以提高GST的FOM值,有利于开发低损耗、高调制空间的损耗型相变光子器件和大规模损耗型相变光子阵列.除了FOM之外,相变材料的结晶温度也会影响器件的编程功耗、循环寿命和稳定性,这要求我们在实际应用场景中根据器件的需求选择合适的相变材料.总之,本文为相变材料的光学性能提供了评价标准,促进了集成光子器件应用中相变材料的定制设计.

外文标题：An evaluation criterion and a design strategy for high-performance optical phase change materials in absorption-modulated integrated photonics

外文摘要：Phase change materials(PCMs)exhibit unique optical properties and have been widely used in various fields,such as optical memory,optical switches,and optical neuro-morphic computing devices.However,owing to the lack of an evaluation criterion for assessing the optical performance of PCMs,the design of new PCMs mainly depends on empirical knowledge.Herein,a new evaluation criterion known as the material figure of merit(FOM2=△k/kamor)was introduced to assess the optical performance of PCMs in absorption-modulated integrated photonics.The FOM value represents the potential of PCMs in constructing high-performance PCM-based photonic devices.A higher FOM value indicates broader applicability of PCMs in photonic devices.To explore the relationships between the optical parameters of PCMs and the FOM value,three new optical PCMs based on Ge2Sb2Te5(GST)were developed according to the theory of optical bandgap.The results indicate that doping with non-metallic elements,such as nitrogen,increases the FOM2 values of GST,which is beneficial for developing low-loss and high-modula-tion space absorption-modulated PCM-based photonic de-vices and large-scale absorption-modulated PCM-based photonic arrays.Additionally,the crystallization temperature of PCMs affects the programming power,endurance,and stability of the devices.Therefore,selecting suitable PCMs tailored to the specific requirements of the device in real-world applications is crucial.Our study provides an evaluation criterion for assessing the optical performance of PCMs,thereby facilitating the design of customized materials for photonic applications.

外文关键词：

phase change materialsfigure of meritoptical bandgapphotonic devices

作者：

夏剑、董云潇、龚俊桀、王子炫、王天赐、杨蕊、缪向水

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作者单位：

School of Integrated Circuits,Huazhong University of Science and Technology,Wuhan 430074,China

Hubei Yangtze Memory Laboratories,Wuhan 430205,China

关键词：

phase change materials figure of merit optical bandgap photonic devices

基金：

Natural Science Foundation for Distinguished Young Scholars of Hubei Province of ChinaNational Key Research and Development ProgramHubei Province Key Scientific and Technological ProjectCenter of Optoelectronic Micro&-Nano Fabrication and Characterizing FacilityWuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology(HUST)

项目编号：

2023AFA0652019YFB22051002022AEA001

出版年：

2024

DOI：

10.1007/s40843-024-2874-2

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(6)