Author Affiliations
Abstract
1 Shandong Inspur Artificial Intelligence Research Institute Company Limited, Jinan 250013, China
2 MIIT Key Laboratory of Photonics Information Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and enormous information capacity for applications in optical displays and encryption. In this work, a tunable polarization multiplexing holographic metasurface controlled by an external magnetic field is proposed. The elaborately designed nanoantennas are arranged on the magneto-optical intermediate layer, which is placed on the metallic reflecting layer. Since the non-diagonal elements of the dielectric tensor of the magneto-optical material become non-zero values once the external magnetic field is applied, the differential absorption for the left and right circularly polarized light can be generated. Meanwhile, the amplitude and phase can be flexibly modulated by changing the sizes of the nanoantennas. Based on this, the dynamic multichannel holographic display of metasurface in the linear and circular polarization channels is realized via magnetic control, and it can provide enhanced security for optical information storage. This work paves the way for the realization of magnetically controllable phase modulation, which is promising in dynamic wavefront control and optical information encryption.
active metasurface magneto-optical effect polarization multiplexing holography dynamic holographic display Chinese Optics Letters
2024, 22(4): 043601
辐射研究与辐射工艺学报
2023, 41(1): 010101
1 高效能服务器和存储技术重点实验室, 济南 250101
2 山东云海国创云计算装备产业创新中心有限公司, 济南 250101
3 浪潮电子信息产业股份有限公司, 济南 250101
4 东南大学 射频与光电集成电路研究所, 南京 210096
采用0.18 μm CMOS工艺设计和实现了一种适用于100 Gbit/s以太网PCS链路的高速异步FIFO 芯片。采用双端口8T结构替代存储器,提高了工作速率。灵敏放大器利用锁存放大器和预充电技术来放大位线上微小信号,减少了传播延迟。为了减小读写时间,研究了存储单元晶体管尺寸对电平翻转时间的影响,既满足了快速访问的要求,又获得了高可靠性的信号传输。芯片(包括焊盘)面积为1.43 mm2。测量结果表明,该FIFO可工作于1.05 GHz,输出信号的眼图清晰,水平张开度达到0.91UI。当电源电压为1.8 V时,电路功耗为143.3 mW。该FIFO适用于16×6.25 Gbit/s以太网PCS链路系统。
双端存储器 物理编码子层 高速 电荷锁存灵敏放大器 预充电技术 dual-port storage PCS high speed charge-transfer latch-based sense amplifier pre-charge technology
1 中国科学院大学 光电学院, 北京 100049
2 中国科学院 光电研究院, 北京 100094
3 西京学院 理学院, 陕西 西安 710123
传统单光束多强度重建(SBMIR)系统中, 多次平移图像传感器所积累的误差导致光电成像系统的成像效果及有效分辨率降低, 为了解决这一问题。本文提出基于平行平晶的三步相干衍射成像系统, 采取插入或抽取 2块平行平晶的方法获取 3个不同的衍射面, 实现了对复振幅型物体的成像及恢复重建。数值模拟及实验表明, 系统有效克服了SBMIR系统中数次平移的误差积累问题, 且仅需记录 3个衍射面, 避免过采样。而且光学系统实现简便、可重复性高。
单光束多强度 相干衍射成像 平行平晶 复振幅 the single-beam multiple-intensity coherent diffraction imaging parallel plates complex amplitude
1 中国科学院大学, 北京 100049
2 中国科学院光电研究院, 北京 100094
Gerchberg-Saxton(GS)相位恢复算法被广泛用在多平面全息显示中,但是大部分平面的相关度很低。研究者们提出了一种补偿的方法,然而它并不有效。本文将这种补偿方法称作强补偿方法,并提出了一种基于弱补偿概念的方法。这个算法的核心是引进相应的权重因子改变进入算法的信息量从而实现弱补偿。数值模拟结果显示,同原始GS相位恢复三维算法相比,用这种算法各平面相关度的平均值和差值可以至少改善59.82%和97.03%。
全息 弱补偿 数值模拟 Gerchberg-Saxton相位恢复算法 相关度 像质 中国激光
2013, 40(10): 1009001