Author Affiliations
Abstract
1 Hubei Key Laboratory for Advanced Memories, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
2 Hubei Yangtze Memory Laboratories, Wuhan 430205, China
3 School of Microelectronics and Faculty of Physics and Electronics Science, Hubei University, Wuhan 430062, China
4 Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
With rapid advancement and deep integration of artificial intelligence and the internet-of-things, artificial intelligence of things has emerged as a promising technology changing people’s daily life. Massive growth of data generated from the devices challenges the AIoT systems from information collection, storage, processing and communication. In the review, we introduce volatile threshold switching memristors, which can be roughly classified into three types: metallic conductive filament-based TS devices, amorphous chalcogenide-based ovonic threshold switching devices, and metal-insulator transition based TS devices. They play important roles in high-density storage, energy efficient computing and hardware security for AIoT systems. Firstly, a brief introduction is exhibited to describe the categories (materials and characteristics) of volatile TS devices. And then, switching mechanisms of the three types of TS devices are discussed and systematically summarized. After that, attention is focused on the applications in 3D cross-point memory technology with high storage-density, efficient neuromorphic computing, hardware security (true random number generators and physical unclonable functions), and others (steep subthreshold slope transistor, logic devices,etc.). Finally, the major challenges and future outlook of volatile threshold switching memristors are presented.
AIoT threshold switching memristor selector neuromorphic computing hardware security Journal of Semiconductors
2023, 44(5): 053102
华中光电技术研究所-武汉光电国家实验室, 湖北 武汉 430223
空间光通信受到大气湍流影响的衰落时间可持续数毫秒,严重影响通信系统的可靠性。提出了一种适合于空间光通信的自适应编解码方案,并且给出了具体的实现方法。针对信道当前不同的状况,采取不同的编解码方案降低系统的误码率。并且采取阈值切换的方法,避免了由于信道状况在设计阈值周边波动时出现的编解码方案频繁切换的现象。经过MATLAB仿真,验证了该方案的可行性。
空间光通信 大气湍流 自适应编解码 混合纠错 阈值切换 FSO atmosphere turbulence adaptive channel coding hybrid error correction threshold switching
哈尔滨工业大学理学院物理系, 黑龙江 哈尔滨 150001
提出用一根掺铒光纤连接两个对称的长周期光纤光栅(EDF-LPFG)对构成的新型全光开关。数值模拟了在交叉相位调制下对应于不同抽运功率的信号光的透射谱; 还研究了在不同光栅的有效折射率调制幅度和光纤吸收系数下,信号光透射率随抽运光功率的变化。导出了器件的阈值开关功率公式。EDF-LPFG对光开关的阈值开关功率比单LPFG光开关的开关功率降低了5个数量级,不到25 mW。
光纤光学 全光开关 长周期光纤光栅 掺铒光纤 低阈值开关功率
1 西安电子科技大学技术物理系, 西安 710071
2 山东大学晶体材料研究所, 济南 250100
基于光擦除折射率光栅和双光束耦合构成了一种新型的非线性光学器件.用带导模型和耦合波方程建立了理论公式.用KNSBN单晶和Ar+激光进行了实验演示.理论和实验都表明该器件具有明显的阈值开关特性.
光折变非线性光学 光开关 阈值开关特性