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Other Areas of Optics
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19 Article(s)
Optical edge detection with adjustable resolution based on liquid crystal polarization gratings
Yang Yang, Xinyang Liu, Yan Wu, Ting Li, Fan Fan, Huihui Huang, and Shuangchun Wen
Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution. The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.
Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution. The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.
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Chinese Optics Letters
Publication Date: Sep. 10, 2020
Vol. 18, Issue 9, 093501 (2020)
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Influence of γ-Fe
2
O
3
nanoparticles doping on the image sticking in VAN-LCD
Ningning Liu, Mohan Wang, Zongyuan Tang, Lin Gao, Shuai Jing, Na Gao, Hongyu Xing, Xiangshen Meng, Zhenghong He, Jian Li, Minglei Cai, Xiaoyan Wang, and Wenjiang Ye
Image sticking in liquid crystal display (LCD) is related to the residual direct current (DC) voltage (RDCV) on the cell and the dynamic response of the liquid crystal materials. According to the capacitance change of the liquid crystal cell under the DC bias, the saturated RDCV (SRDCV) can be obtained. The response time can be obtained by testing the optical dynamic response of the liquid crystal cell, thereby evaluating the image sticking problem. Based on this, the image sticking of vertical aligned nematic (VAN) LCD (VAN-LCD) with different cell thicknesses (3.8 μm and 11.5 μm) and different concentrations of γ-Fe2O3 nanoparticles (0.017 wt.%, 0.034 wt.%, 0.051 wt.%, 0.068 wt.%, 0.136 wt.%, 0.204 wt.%, and 0.272 wt.%) was evaluated, and the effect of nano-doping was analyzed. It is found that the SRDCV and response time decrease firstly and then increase with the increase of the doping concentration of γ-Fe2O3 nanoparticles in the VAN cell. When the doping concentration is 0.034 wt.%, the γ-Fe2O3 nanoparticles can adsorb most of the free impurity ions in liquid crystal materials, resulting in 70% reduction in the SRDCV, 8.11% decrease in the decay time, and 15.49% reduction in the rise time. The results show that the doping of γ-Fe2O3 nanoparticles can effectively improve the image sticking of VAN-LCD and provide useful guidance for improving the display quality.
Image sticking in liquid crystal display (LCD) is related to the residual direct current (DC) voltage (RDCV) on the cell and the dynamic response of the liquid crystal materials. According to the capacitance change of the liquid crystal cell under the DC bias, the saturated RDCV (SRDCV) can be obtained. The response time can be obtained by testing the optical dynamic response of the liquid crystal cell, thereby evaluating the image sticking problem. Based on this, the image sticking of vertical aligned nematic (VAN) LCD (VAN-LCD) with different cell thicknesses (3.8 μm and 11.5 μm) and different concentrations of γ-Fe2O3 nanoparticles (0.017 wt.%, 0.034 wt.%, 0.051 wt.%, 0.068 wt.%, 0.136 wt.%, 0.204 wt.%, and 0.272 wt.%) was evaluated, and the effect of nano-doping was analyzed. It is found that the SRDCV and response time decrease firstly and then increase with the increase of the doping concentration of γ-Fe2O3 nanoparticles in the VAN cell. When the doping concentration is 0.034 wt.%, the γ-Fe2O3 nanoparticles can adsorb most of the free impurity ions in liquid crystal materials, resulting in 70% reduction in the SRDCV, 8.11% decrease in the decay time, and 15.49% reduction in the rise time. The results show that the doping of γ-Fe2O3 nanoparticles can effectively improve the image sticking of VAN-LCD and provide useful guidance for improving the display quality.
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Chinese Optics Letters
Publication Date: Mar. 10, 2020
Vol. 18, Issue 3, 033501 (2020)
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Single fiber dual-functionality optical tweezers based on graded-index multimode fiber
Zhihai Liu, Tong Wang, Yaxun Zhang, Xiaoyun Tang, Peikun Liu, Yu Zhang, Xinghua Yang, Jianzhong Zhang, Jun Yang, and Libo Yuan
We propose and demonstrate single fiber dual-functionality optical tweezers based on a graded-index multimode fiber. By using the multi-angle fiber grinding and polishing technology, we fabricate the multimode fiber tip to be a special tapered shape, contributing to focus the outgoing beam with a large intensity gradient for the first functionality—three-dimensional contactless trapping of a microparticle. By adjusting the radial direction offset between the lead-in single mode fiber and the graded-index multimode fiber, we perform the second functionality—axial shift of the trapped microparticle with respect to the fiber tip without need of moving the fiber probe itself. It is convenient for practical applications. The theoretical and experimental results about the relationship between the radial offset and the equilibrium positions of the microparticle have the good consistency. Tailoring the trap and axial shift of the microparticle based on the graded-index multimode fiber provides convenient avenues for fiber optical tweezers applied in practical researches.
We propose and demonstrate single fiber dual-functionality optical tweezers based on a graded-index multimode fiber. By using the multi-angle fiber grinding and polishing technology, we fabricate the multimode fiber tip to be a special tapered shape, contributing to focus the outgoing beam with a large intensity gradient for the first functionality—three-dimensional contactless trapping of a microparticle. By adjusting the radial direction offset between the lead-in single mode fiber and the graded-index multimode fiber, we perform the second functionality—axial shift of the trapped microparticle with respect to the fiber tip without need of moving the fiber probe itself. It is convenient for practical applications. The theoretical and experimental results about the relationship between the radial offset and the equilibrium positions of the microparticle have the good consistency. Tailoring the trap and axial shift of the microparticle based on the graded-index multimode fiber provides convenient avenues for fiber optical tweezers applied in practical researches.
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Chinese Optics Letters
Publication Date: May. 10, 2018
Vol. 16, Issue 5, 053501 (2018)
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Fusion of the low-light-level visible and infrared images for night-vision context enhancement
Jin Zhu, Weiqi Jin, Li Li, Zhenghao Han, and Xia Wang
For better night-vision applications using the low-light-level visible and infrared imaging, a fusion framework for night-vision context enhancement (FNCE) method is proposed. An adaptive brightness stretching method is first proposed for enhancing the visible image. Then, a hybrid multi-scale decomposition with edge-preserving filtering is proposed to decompose the source images. Finally, the fused result is obtained via a combination of the decomposed images in three different rules. Experimental results demonstrate that the FNCE method has better performance on the details (edges), the contrast, the sharpness, and the human visual perception. Therefore, better results for the night-vision context enhancement can be achieved.
For better night-vision applications using the low-light-level visible and infrared imaging, a fusion framework for night-vision context enhancement (FNCE) method is proposed. An adaptive brightness stretching method is first proposed for enhancing the visible image. Then, a hybrid multi-scale decomposition with edge-preserving filtering is proposed to decompose the source images. Finally, the fused result is obtained via a combination of the decomposed images in three different rules. Experimental results demonstrate that the FNCE method has better performance on the details (edges), the contrast, the sharpness, and the human visual perception. Therefore, better results for the night-vision context enhancement can be achieved.
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Chinese Optics Letters
Publication Date: Jan. 10, 2018
Vol. 16, Issue 1, 013501 (2018)
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Optical tug-of-war tweezers: shaping light for dynamic control of bacterial cells-corrigendum
Joshua Lamstein, Anna Bezryadina, Daryl Preece, Joseph C. Chen, and Zhigang Chen
The authors would like to apologize for an error in the paper Chinese Optics Letters vol. 15, no. 3, page 030010. On page 030010-3, the caption for Figs. 5 (a)–(c) should read “2 μm silica” (not 3 μm polystyrene).
The authors would like to apologize for an error in the paper Chinese Optics Letters vol. 15, no. 3, page 030010. On page 030010-3, the caption for Figs. 5 (a)–(c) should read “2 μm silica” (not 3 μm polystyrene).
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Chinese Optics Letters
Publication Date: Sep. 10, 2017
Vol. 15, Issue 9, 093502 (2017)
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Thermal-stable mixed-cation lead halide perovskite solar cells
|
Editors' Pick
Shuai Gu, Pengchen Zhu, Renxing Lin, Mingyao Tang, Shining Zhu, and Jia Zhu
As perovskite solar cells show tremendous potential for widespread applications, we find that adding inorganic thermal-stable cesium ions into MAPbI3 results in significantly improves thermal stability. For un-encapsulated perovskite devices, the energy conversion efficiency maintains about 75% of its original value (over 15%) in the MA0.85Cs0.05PbI3 device under 80 min of heating at 140°C in a dry atmosphere (RH≤30%). With significantly improved thermal stability achieved by a convenient process, it is expected that this type of mixed-cation perovskites can further facilitate large scale applications.
As perovskite solar cells show tremendous potential for widespread applications, we find that adding inorganic thermal-stable cesium ions into MAPbI3 results in significantly improves thermal stability. For un-encapsulated perovskite devices, the energy conversion efficiency maintains about 75% of its original value (over 15%) in the MA0.85Cs0.05PbI3 device under 80 min of heating at 140°C in a dry atmosphere (RH≤30%). With significantly improved thermal stability achieved by a convenient process, it is expected that this type of mixed-cation perovskites can further facilitate large scale applications.
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Chinese Optics Letters
Publication Date: Sep. 10, 2017
Vol. 15, Issue 9, 093501 (2017)
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Luminescent solar concentrators with a bottom-mounted photovoltaic cell: performance optimization and power gain analysis
Ningning Zhang, Yi Zhang, Jun Bao, Feng Zhang, Sen Yan, Song Sun, and Chen Gao
Polymethyl methacrylate (PMMA) plate luminescent solar concentrators with a bottom-mounted (BM-LSCs) photovoltaic (PV) cell are fabricated by using a mixture of Lumogen Red 305 and Yellow 083 fluorescent dyes and a commercial monocrystalline silicon cell. The fabricated LSC with dye concentrations of 40 ppm has the highest power gain of 1.50, which is the highest value reported for the dye-doped PMMA plate LSCs. The power gain of the LSC comes from three parts: the waveguide light, the transmitted light, and the reflected light from a white reflector, and their contributions are analyzed quantitatively. The results suggest that the BM-LSCs have great potential for future low-cost PV devices in building integrated PV applications.
Polymethyl methacrylate (PMMA) plate luminescent solar concentrators with a bottom-mounted (BM-LSCs) photovoltaic (PV) cell are fabricated by using a mixture of Lumogen Red 305 and Yellow 083 fluorescent dyes and a commercial monocrystalline silicon cell. The fabricated LSC with dye concentrations of 40 ppm has the highest power gain of 1.50, which is the highest value reported for the dye-doped PMMA plate LSCs. The power gain of the LSC comes from three parts: the waveguide light, the transmitted light, and the reflected light from a white reflector, and their contributions are analyzed quantitatively. The results suggest that the BM-LSCs have great potential for future low-cost PV devices in building integrated PV applications.
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Chinese Optics Letters
Publication Date: Jun. 10, 2017
Vol. 15, Issue 6, 063501 (2017)
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Self-seeded quantum-dash laser based 5 m-128 Gb/s indoor free-space optical communication: erratum
M. A. Shemis, A. M. Ragheb, E. Alkhazraji, M. A. Esmail, H. Fathallah, S. Alshebeili, and M. Z. M. Khan
The authors would like to apologize for an error in our paper in Chin. Opt. Lett. 15(10), 100604 (2017).
The authors would like to apologize for an error in our paper in Chin. Opt. Lett. 15(10), 100604 (2017).
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Chinese Optics Letters
Publication Date: Dec. 10, 2017
Vol. 15, Issue 12, 123501 (2017)
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Three-step lithography to the fabrication of vertically coupled micro-ring resonators in amorphous silicon-on-insulator-corrigendum
Jun Cheng, and Duk-Yong Choi
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Chinese Optics Letters
Publication Date: Jan. 01, 2016
Vol. 14, Issue 4, 043501 (2016)
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Design and preparation of a large-size laser-protective coating for solar arrays on spacecrafts
Zhenfeng Shen
In this letter, we introduce the project of multilayer dielectric film based on conventional optics to design laser-protective coating. A desired material with an ideal refractive index is used to optimize the design results. Two film-thickness masks are designed to improve the uniformity of large-size coatings. Experimental results show that the average spectral transmittance from 400 to 1000 nm is higher than 85%, the attenuation of high-energy laser at both 532 and 1064 nm is larger than 98% in the range of ±20° and the film uniformity of large area is more than 98.2%. The coating performance observed meets the requirements of both utilization of solar energy and laser protection.
In this letter, we introduce the project of multilayer dielectric film based on conventional optics to design laser-protective coating. A desired material with an ideal refractive index is used to optimize the design results. Two film-thickness masks are designed to improve the uniformity of large-size coatings. Experimental results show that the average spectral transmittance from 400 to 1000 nm is higher than 85%, the attenuation of high-energy laser at both 532 and 1064 nm is larger than 98% in the range of ±20° and the film uniformity of large area is more than 98.2%. The coating performance observed meets the requirements of both utilization of solar energy and laser protection.
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Chinese Optics Letters
Publication Date: Mar. 25, 2014
Vol. 12, Issue s1, S13501 (2014)
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Topics
3d holographic display
3d imaging and display
Applications
Atmospheric and oceanic optics
Atmospheric, Oceanic, Space, and Environmental Optics
Atomic and Molecular Optics
Atomic and Molecular Physics
Auto-stereography and virtual reality
Biomedical Optics
Biophotonics
Coatings for solar cell
Coherence and statistical optics
COHERENCE OPTICS AND STATISTICAL OPTICS
Computer generated hologram
Computer-generated holography
Deposition and process control
Design and analysis
Detectors
Diffraction and Gratings
Diffraction, Gratings, and Holography
Digital Holography
Duv/euv coatings
Editorial
Fiber Optics and Optical Communications
Fourier optics and optical signal processing
Fourier Optics and Signal Processing
General
Geometric Optics
Geometrical optics
Holographic reconstruction, display,and projection
Holography
Image processing
Image Processing and Machine Vision
Imaging Systems
Imaging Systems and Image Processing
Infrared and Terahertz Photonics
Instrumentation, measurement, and metrology
Instrumentation, Measurement, and Optical Sensing
Integral imaging
Integrate optics
Integrated Optics
Lasers and Laser Optics
Lasers, Optical Amplifiers, and Laser Optics
Letters
Light-matter Interaction
Machine Vision
Materials
Measurement
Medical and biological imaging
Medical optics and biotechnology
Metamaterials, plasmon polaritons, and waveguides in terahertz region
Microscopy
Microwave Photonics
Multiphoton processes
Nanophotonics
Nanophotonics, Metamaterials, and Plasmonics
Nolinear optics
Nonlinear Optics
optical computing
OPTICAL DATA STORAGE
Optical Design and Fabrication
optical design and fabrications
Optical devices
Optical divces
Optical Materials
Optical Sensing, Measurements, and Metrology
Optical trapping
Optics at Surfaces
Optics in Computing
Optics in Computing and Optical Data Storage
Optics in Interdisciplinary Research
Optoelectronics
Other Areas of Optics
Physical Optics
Plasmonics and Metamaterials
Quantum optics
Quantum Optics and Quantum Information
remote sensing
Remote Sensing and Sensors
Research Articles
Reviews
Scattering
Solar Energy and Photovoltaics
Sources and mechanisms of terahertz radiation
Special Issue on 20th Anniversary of Wuhan National Laboratory for Optoelectronics (WNLO)
Special Issue on 70th anniversary of National University of Defense Technology
Special Issue on Lithium Niobate Based Photonic Devices
Special Issue on Lithium Noibate Based Photonic Devices
Special Issue on Metal Halide Perovskite and Their Applications
Special Issue on OISE Major Jointly Established by Tianjin University and Nankai University
Special Issue on Optical Metasurfaces: Fundamentals and Applications
Special Issue on Spatiotemporal Optical Fields and Time-Varying Optical Materials
Special Issue on the 20th Anniversary of Wuhan National Laboratory for Optoelectronics (WNLO)
Spectroscopy
Spectroscopy, imaging, and sensing using terahertz radiation
Thin films
Thin Films and Optics at Surfaces
Ultrafast Optics
Ultrafast Optics and Attosecond/High-field Physics
Ultrafast Optics: fundamentals and applications
Underwater Wireless Optical Communication
vision and color
Vision, color, and visual
Vision, Color, and Visual Optics
Visual Optics and Displays
X-ray Optics