Author Affiliations
Abstract
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3 Peng Cheng Laboratory, Shenzhen 518055, China
4 Wuhan Institute of Quantum Technology, Wuhan 430206, China
For a conventional cascaded metasurface, the combination channel and each single channel are mutually dependent because the phase modulation of a cascaded metasurface is the sum of each single one. Here we propose a cascaded metasurface that can independently encode information into multiple channels. Based on the orientation degeneracy of anisotropic metasurfaces, each single metasurface can produce a quick-response (QR) image in the near field, governed by the Malus law, while the combined channel can produce a holographic image in the far field, governed by geometric phase. The independent and physically separated trichannel design makes information encryption safer.
cascaded metasurfaces optical encryption holography nanoprinting Chinese Optics Letters
2023, 21(2): 020003
Author Affiliations
Abstract
1 School of Electronic Information and School of Microelectronics, Wuhan University, Wuhan 430072, China
2 Peng Cheng Laboratory, Shenzhen 518055, China
3 Wuhan Institute of Quantum Technology, Wuhan 430206, China
4 Hubei Luojia Laboratory, Wuhan 430079, China
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Metasurface-based nanoprinting (meta-nanoprinting) has fully demonstrated its advantages in ultrahigh-density grayscale/color image recording and display. A typical meta-nanoprinting device usually has image resolutions reaching 80 k dots per inch (dpi), far exceeding conventional technology such as gravure printing (typ. 5 k dpi). Besides, by fully exploiting the design degrees of freedom of nanostructured metasurfaces, meta-nanoprinting has been developed from previous single-channel to multiple-channels, to current multifunctional integration or even dynamic display. In this review, we overview the development of meta-nanoprinting, including the physics of nanoprinting to manipulate optical amplitude and spectrum, single-functional meta-nanoprinting, multichannel meta-nanoprinting, dynamic meta-nanoprinting and multifunctional metasurface integrating nanoprinting with holography or metalens, etc. Applications of meta-nanoprinting such as image display, vortex beam generation, information decoding and hiding, information encryption, high-density optical storage and optical anti-counterfeiting have also been discussed. Finally, we conclude the opportunities and challenges/perspectives in this rapidly developing research field of meta-nanoprinting.
metasurface nanoprinting structural-color hologram multifunctional device Opto-Electronic Science
2022, 1(10): 220011
1武汉大学 电子信息学院,湖北 武汉 430072
超表面具有亚波长尺度下精密高效的光波操控能力,但在其单独实现主动式调控方面,目前仍有诸多技术困难亟待克服。液晶与超表面的结合有望发挥各自的长处,实现一种分辨率高、衍射角大、超紧凑的新型主动式光调控器件。以液晶与超表面两部分功能设计的独立与否作为分类依据,回顾了近年来主动式液晶超表面的研究进展,具体包括液晶波片与偏振敏感超表面结合、液晶环境与共振型超表面结合、液晶与超表面光学性质互补等。最后对主动式液晶超表面所面临的挑战以及发展前景进行了讨论和展望。
红外与激光工程
2020, 49(9): 20201036
Author Affiliations
Abstract
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 NOEIC, State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China
3 School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China
4 e-mail: lizile@whu.edu.cn
5 e-mail: gxzheng@whu.edu.cn
The unwanted zero-order light accompanied by the birth of diffractive optical elements and caused mainly by fabrication errors and wavelength variations is a key factor that deteriorates the performance of diffraction-related optical devices such as holograms, gratings, beam shapers, beam splitters, optical diffusers, and diffractive microlenses. Here, inspired by the unique characteristic of nano-polarizer-based metasurfaces for both positive and negative amplitude modulation of incident light, we propose a general design paradigm to eliminate zero-order diffraction without burdening the metasurface design and fabrication. The experimentally demonstrated meta-hologram, which projects a holographic image with a wide angle of in the far field, presents a very low zero-order intensity (only 0.7% of the total energy of the reconstructed image). More importantly, the zero-order-free meta-hologram has a large tolerance limit for wavelength variations (under a broadband illumination from 520 to 660 nm), which brings important technical advances. The strategy proposed could significantly relieve the fabrication difficulty of metasurfaces and be viable for various diffractive-optics-related applications including holography, laser beam shaping, optical data storage, vortex beam generation, and so on.
Photonics Research
2020, 8(5): 05000723
武汉大学 电子信息学院, 湖北 武汉 430072
提出了一种通过超表面实现超高分辨率灰度图像的存储和显示方法。利用金属纳米砖阵列的偏振分光特性, 结合马吕斯定律, 将图像的灰度信息转换为纳米砖阵列中纳米砖的方向角排布, 从而实现精确、连续的灰度调制。实验结果表明, 可在该超表面的反射近场处观测到清晰的灰度图像, 分辨率高达90 714ppi。这种基于超表面的图像显示技术设计方法简单灵活, 且超表面具有体积小、重量轻、结构紧凑、易于集成等优势, 因此可广泛应用于高密度光信息存储, 高端产品防伪, 信息加密等领域。
超表面 图像显示 马吕斯定律 高分辨率 metasurfaces image display Maluss law high resolution
Author Affiliations
Abstract
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 NOEIC, State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China
3 Photonics Research Centre, Guilin University of Electronic Technology, Guilin 541004, China
4 Integrated Circuit Advanced Process Center, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
The design of a conventional zoom lens is always challenging because it requires not only sophisticated optical design strategy, but also complex and precise mechanical structures for system adjustment. Here, we propose a continuous-zoom lens consisting of two chiral geometric metasurfaces with dielectric nanobrick arrays sitting on a transparent substrate. The metalens can continuously vary the focal length by rotating either of the two metasurfaces around its optical axis without changing any other conditions. Due to the polarization dependence of the geometric metasurface, the positive and negative polarities are interchangeable in one identical metalens only by changing the handedness of the incident circularly polarized light, which can generate varying focal lengths ranging from ∞ to +∞ in principle.
160.3918 Metamaterials 160.4670 Optical materials Chinese Optics Letters
2019, 17(11): 111603
1 武汉大学 电子信息学院, 湖北 武汉 430072
2 武汉邮电科学研究院 光纤通信技术与网络国家重点实验室, 湖北 武汉 430074
提出一种基于电介质纳米砖阵列的扇出衍射光学元件的设计和实现方案, 其纳米砖的深宽比低至1.5。这种扇出衍射光学元件被一束波长为633 nm的入射光束照射时, 可以在远场中得到均匀的4×4点阵, 发散角为32°×32°, 且数值模拟与实验结果吻合良好。基于超表面材料的扇出衍射光学元件具有连续、精确的相位操纵能力和较高的偏振转换效率, 并且仅需一步光刻制造工艺, 可以广泛应用于工程光学的各种领域, 例如光学传感, 激光雷达, 激光加工等。
超表面材料 几何相位 扇出衍射光学元件 相位调控 metasurfaces geometric phase fan-out diffractive optical elements phase manipulation