Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip
Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip
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CMOS 芯片上的超紧凑轨道角动量分选机
DOI：
10.1021/acs.nanolett.2c00572
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发表时间：
2022-05-25
期刊：
影响因子：
10.8
通讯作者：
Xiao, Shumin
中科院分区：
文献类型：
--
作者：
Cheng, Jiaping;Sha, Xinbo;Xiao, Shumin
片上集成轨道角动量（OAM）排序在应对数据流量指数增长的严峻挑战方面具有重要意义。尽管不断取得成功，目前的解复用技术要么大幅牺牲效率，要么失去系统的紧凑性。在这里，我们实验证明了一个超紧凑的OAM分选机使用二氧化钛超颖表面集成到互补金属氧化物半导体（CMOS）相机。利用传输相位，我们将大体积系统中的幺正变换理论转化为两个TiO 2超颖表面，分别负责对数极坐标变换、扇出光束复制和聚焦以及相位校正和傅里叶变换等功能。平面超颖表面双合件使人们能够将OAM分类器集成到相机芯片上。因此，具有拓扑电荷m = -3到3的OAM光束被CMOS相机分离，平均串扰为-6.43dB。这种方法将揭示下一代OAM模式处理。
On-chip integrated orbital angular momentum (OAM) sorting is of great importance in tackling the severe challenge of exponential growth in data traffic. Despite the continuous success, current demultiplexing techniques either scarify efficiency dramatically or lose the compactness of a system. Here we experimentally demonstrate an ultracompact OAM sorter using TiO2 metasurfaces integrated onto a complementary metal-oxide-semiconductor (CMOS) camera. By utilizing the propagation phases, we transfer the unitary transformation theory in bulky systems into two TiO2 metasurfaces, responsible for the functions of log-polar transformation and fan-out beam copying and focusing as well as the functions of phase correction and Fourier transform. The flatform metasurface doublet enables one to integrate the OAM sorter onto a camera chip. Consequently, OAM beams with topological charges of m = -3 to 3 were separated by a CMOS camera with an average crosstalk of -6.43 dB. This approach shall shed light on next-generation OAM modes processing.