Reconstructing a plasmonic metasurface for a broadband high-efficiency optical vortex in the visible frequency

Nanoscale ◽  
2018 ◽  
Vol 10 (26) ◽  
pp. 12378-12385 ◽  
Author(s):  
Bing-Rui Lu ◽  
Jianan Deng ◽  
Qi Li ◽  
Sichao Zhang ◽  
Jing Zhou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Berry Phase ◽  
Optical Vortex ◽  
Vortex Generation ◽  
Efficiency Enhancement ◽  
High Quality ◽  
Visible Frequency

We optimized a Berry-phase-based metasurface for high quality vortex generation in optical frequencies with a >20% efficiency enhancement in a broad waveband.

High-efficiency optical vortex generation with hybrid all-dielectric geometric-metasurface in visible frequency

2021 ◽  
Vol 14 (1) ◽  
pp. 012008
Author(s):  
Xiaosai Wang ◽  
Bingyi Liu ◽  
Jiabao Yao ◽  
Jie Song ◽  
Yongyuan Jiang
Keyword(s):  
High Efficiency ◽  
Optical Vortex ◽  
Vortex Generation ◽  
Visible Frequency

Arbitrary and reconfigurable optical vortex generation: a high-efficiency technique using director-varying liquid crystal fork gratings

2015 ◽  
Vol 3 (4) ◽  
pp. 133 ◽  
Author(s):  
Peng Chen ◽  
Bing-Yan Wei ◽  
Wei Ji ◽  
Shi-Jun Ge ◽  
Wei Hu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
High Efficiency ◽  
Optical Vortex ◽  
Vortex Generation

scholarly journals High-efficiency, broadband all-dielectric transmission metasurface for optical vortex generation

2019 ◽  
Vol 9 (6) ◽  
pp. 2699 ◽  
Author(s):  
Heng Zhou ◽  
Jiaqi Yang ◽  
Chunqing Gao ◽  
Shiyao Fu
Keyword(s):  
High Efficiency ◽  
Optical Vortex ◽  
Vortex Generation

scholarly journals High-efficiency, broadband all-dielectric transmission metasurface for optical vortex generation: erratum

2019 ◽  
Vol 9 (7) ◽  
pp. 2806 ◽  
Author(s):  
Heng Zhou ◽  
Jiaqi Yang ◽  
Chunqing Gao ◽  
Shiyao Fu
Keyword(s):  
High Efficiency ◽  
Optical Vortex ◽  
Vortex Generation

scholarly journals Enhancing the Optical Efficiency of Near-Eye Displays with Liquid Crystal Optics

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 107
Author(s):  
Tao Zhan ◽  
En-Lin Hsiang ◽  
Kun Li ◽  
Shin-Tson Wu
Keyword(s):  
Virtual Reality ◽  
Liquid Crystal ◽  
High Efficiency ◽  
Berry Phase ◽  
Optical Element ◽  
Liquid Crystal Polymer ◽  
Proof Of Concept ◽  
Optical Efficiency ◽  
Crystal Polymer ◽  
Light Efficiency

We demonstrate a light efficient virtual reality (VR) near-eye display (NED) design based on a directional display panel and a diffractive deflection film (DDF). The DDF was essentially a high-efficiency Pancharatnam-Berry phase optical element made of liquid crystal polymer. The essence of this design is directing most of the display light into the eyebox. The proposed method is applicable for both catadioptric and dioptric VR lenses. A proof-of-concept experiment was conducted with off-the-shelf optical parts, where the light efficiency was enhanced by more than 2 times.

scholarly journals An Underwater Image Enhancement Algorithm Based on Generative Adversarial Network and Natural Image Quality Evaluation Index

2021 ◽  
Vol 9 (7) ◽  
pp. 691
Author(s):  
Kai Hu ◽  
Yanwen Zhang ◽  
Chenghang Weng ◽  
Pengsheng Wang ◽  
Zhiliang Deng ◽  
...  
Keyword(s):  
Image Quality ◽  
Image Enhancement ◽  
Quality Evaluation ◽  
High Efficiency ◽  
Natural Image ◽  
High Quality ◽  
Generative Adversarial Network ◽  
Image Quality Evaluation ◽  
Adversarial Network ◽  
Underwater Image

When underwater vehicles work, underwater images are often absorbed by light and scattered and diffused by floating objects, which leads to the degradation of underwater images. The generative adversarial network (GAN) is widely used in underwater image enhancement tasks because it can complete image-style conversions with high efficiency and high quality. Although the GAN converts low-quality underwater images into high-quality underwater images (truth images), the dataset of truth images also affects high-quality underwater images. However, an underwater truth image lacks underwater image enhancement, which leads to a poor effect of the generated image. Thus, this paper proposes to add the natural image quality evaluation (NIQE) index to the GAN to provide generated images with higher contrast and make them more in line with the perception of the human eye, and at the same time, grant generated images a better effect than the truth images set by the existing dataset. In this paper, several groups of experiments are compared, and through the subjective evaluation and objective evaluation indicators, it is verified that the enhanced image of this algorithm is better than the truth image set by the existing dataset.

Heteroepitaxy of Ge on Cube-Textured Ni(001) Foils Through CaF2 Buffer Layer

MRS Advances ◽  
2016 ◽  
Vol 1 (43) ◽  
pp. 2947-2952
Author(s):  
L. Chen ◽  
Z.-H. Lu ◽  
T.-M. Lu ◽  
I. Bhat ◽  
S.B. Zhang ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Efficiency ◽  
Electron Backscatter Diffraction ◽  
Low Cost ◽  
High Quality ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Electron Backscatter ◽  
Image Position ◽  
Backscatter Diffraction

ABSTRACTEpitaxial Ge films are useful as a substrate for high-efficiency solar cell applications. It is possible to grow epitaxial Ge films on low cost, cube textured Ni(001) sheets using CaF2(001) as a buffer layer. Transmission electron microscopy (TEM) analysis indicates that the CaF2(001) lattice has a 45o in-plane rotation relative to the Ni(001) lattice. The in-plane epitaxy relationships are CaF2[110]//Ni[100] and CaF2[$\bar 1$10]//Ni[010]. Energy dispersive spectroscopy (EDS) shows a sharp interface between Ge/CaF2 as well as between CaF2/Ni. Electron backscatter diffraction (EBSD) shows that the Ge(001) film has a large grain size (∼50 μm) with small angle grain boundaries (< 8o). The epitaxial Ge thin film has the potential to be used as a substrate to grow high quality III-V and II-VI semiconductors for optoelectronic applications.

High-order optical vortex generation in a few-mode fiber via cascaded acoustically driven vector mode conversion

2016 ◽  
Vol 41 (21) ◽  
pp. 5082 ◽  
Author(s):  
Wending Zhang ◽  
Ligang Huang ◽  
Keyan Wei ◽  
Peng Li ◽  
Biqiang Jiang ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Optical Vortex ◽  
High Order ◽  
Vortex Generation ◽  
Vector Mode
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