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Wideband circular-polarized transmitarray for generating a high-purity vortex beam Correspondence

Liangjie QIU, Xiuping LI, Zihang QI, Wenyu ZHAO, Yuhan HUANG,xpli@bupt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 6, Pages 927-934 doi: 10.1631/FITEE.2200539

Abstract: In this correspondence, a wideband circular-polarized (CP) transmitarray (TA) in the Ka-band is presented for generating a high-purity vortex beam. The proposed element is composed of two identical combinations separated by an air layer. The subwavelength structure and double-resonance characteristics ensure the stable phase shift of the element within the 1-dB transmission bandwidth of 28.4%. A square aperture TA fed by a horn antenna is fabricated and measured. Owing to the honeycomb arrangement of elements, the mode purity of l=−1 is >0.93 in a wide band from 28.5 to 38 GHz. The measured peak gain is 22.3 dBic, and the 3-dB axial ratio bandwidth is 27.6%. The performance of the proposed antenna demonstrates its potential for high-capacity wireless communication and high-quality radar imaging.

Keywords：轨道角动量；涡旋波束；透射阵；宽带；高纯度

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Wavelength-selective wavefront shaping by metasurface Correspondence

Zixin CAI, Xin HE, Xin LIU, Shijie TU, Xinjie SUN, Paul BECKETT, Aditya DUBEY, Arnan MITCHELL, Guanghui REN, Xu LIU, Xiang HAO,xinhe.wins@outlook.com,guanghui.ren@rmit.edu.au,haox@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 4, Pages 617-625 doi: 10.1631/FITEE.2200510

Abstract: 精确的、与波长相关的相位调制在许多领域中是必不可少的，比如超分辨成像、全彩色全息、微纳加工以及光通讯。这一要求很难通过单一的传统光学元件实现，一般需要使用多个光学元件组合完成。本文提出一种可以实现波长选择性波前整形的超表面设计方法。具体来说，本文设计了一种超表面，它能够对785 nm波长的光做涡旋相位调制，同时不影响590 nm波长的光保持原有相位分布。本文通过干涉仪以及对应点扩散函数的测量来验证不同波长下的波前分布。与已提出的空间复用方式以及色散工程的方法相比，我们提出的设计方法更加直接，优化难度小，适用于需要波长选择性编码的光学系统。本文所提平面光学器件对于需要波长选择性编码的光学系统具有重要应用意义。

Keywords：超表面；波长选择性；涡旋光；波前整形

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Light field imaging: models, calibrations, reconstructions,and applications Review

Hao ZHU, Qing WANG, Jingyi YU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 9, Pages 1236-1249 doi: 10.1631/FITEE.1601727

Abstract: Light field imaging is an emerging technology in computationalphotography areas. Based on innovative designs of the imaging modeland the optical path, light field cameras not only record the spatialintensity of threedimensional (3D) objects, but also capture the angularinformation of the physical world, which provides new ways to addressvarious problems in computer vision, such as 3D reconstruction, saliencydetection, and object recognition. In this paper, three key aspectsof light field cameras, i.e., model, calibration, and reconstruction,are reviewed extensively. Furthermore, light field based applicationson informatics, physics, medicine, and biology are exhibited. Finally,open issues in light field imaging and long-term application prospectsin other natural sciences are discussed.

Keywords： Light field imaging Plenoptic function Imaging model Calibration Reconstruction

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Review of optical tweezers in vacuum Special Feature on Precision Measurement and Inst

Nan LI, Xun-min ZHU, Wen-qiang LI, Zhen-hai FU, Meng-zhu HU, Hui-zhu HU

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5, Pages 655-673 doi: 10.1631/FITEE.1900095

Abstract:

As a versatile tool for trapping and manipulating neutral particles, optical tweezers have been studied in a broad range of fields such as molecular biology, nanotechnology, and experimentally physics since Arthur Ashkin pioneered the field in the early 1970s. By levitating the “sensor” with a laser beam instead of adhering it to solid components, excellent environmental decoupling is achieved. Furthermore, unlike levitating particles in liquid or air, optical tweezers operating in vacuum are isolated from environmental thermal noise, thus eliminating the primary source of dissipation present for most inertial sensors. This attracted great attention in both fundamental and applied physics. In this paper we review the history and the basic concepts of optical tweezers in vacuum and provide an overall understanding of the field.

Keywords： Optical tweezers Optical trapping in vacuum Optical cooling

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Current Situation and Prospects of the Solar Photovoltaic Industry in China

Kong Fantai, Dai Songyuan

Strategic Study of CAE 2016, Volume 18, Issue 4, Pages 51-54 doi: 10.15302/J-SSCAE-2016.04.008

Abstract:

Power produced through solar photovoltaic technology is an important form of renewable energy and also the focus of China’s current efforts to strengthen the global competitiveness of its strategic emerging industries. In this paper, a detailed analysis of the solar energy photovoltaic industry–on both the domestic and international levels–is conducted to assess the development of current and future trends, present state of the industry, and problems faced by China's solar photovoltaic industry. Furthermore, some suggestions and prospects for the healthy future development of the photovoltaic industry are also presented.

Keywords： solar photovoltaic solar cell photovoltaic industry

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On-Line Supervisory Technology for Q-Factor in the Optical Supervisory Channel of Optical Transport Network

Tang Yong,Sun Xiaohan,Zhang Mingde,Ding Dong

Strategic Study of CAE 2001, Volume 3, Issue 12, Pages 71-75

Abstract:

In this paper, a hierarchical model of the optical transport network (OTN) with an optical supervisory channel (OSC) subsystem is discussed, and that the reliability of operation, administration and management (OAM) signals is rested with the quality of signals transported in OSC is indicated by analyzing the charac-teristics of signals in OSC. Basing on the one-to-one correspondence of Q-factor with bit-error-ratio (BER) in data communication systems, an on-line supervisory scheme for Q-factor of signals in OSC is presented, and the supervisory module by a digital signal processor (DSP) approach is designed to implement on-line supervision for Q-factor.

Keywords： optical transport network (OTN) optical supervisory channel (OSC) OAM Q-factor supervision

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Prospects of Photovoltaic Technology

Zhenguo Li

Engineering 2023, Volume 21, Issue 2, Pages 28-31 doi: 10.1016/j.eng.2022.07.008

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Explanation of Pathological Changes of Five Zang Organs in Wuxingshengke

吉良展,陈光曼

Strategic Study of CAE 2006, Volume 8, Issue 4, Pages 94-94

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Development of the Long Afterglow Phosphors and Its Production

Xiao Zhiguo,Tang Mingdao

Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 82-86

Abstract:

The development of long afterglow phosphors is discussed in this paper. Property and application of the phosphors are introduced in detail. It is sure that new long afterglow phosphors is excellent compared with traditional phosphors ZnS. Prospects of long afterglow phosphors is studied in the same time.

Keywords： auto-photoluminesent pigment afterglow photoluminesent materials RE elements

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Dual-Comb Ranging Review

Zebin Zhu, Guanhao Wu

Engineering 2018, Volume 4, Issue 6, Pages 772-778 doi: 10.1016/j.eng.2018.10.002

Abstract:

Absolute distance measurement is a fundamental technique in mobile and large-scale dimensional metrology. Dual-comb ranging is emerging as a powerful tool that exploits phase resolution and frequency accuracy for high-precision and fast-rate distance measurement. Using two coherent frequency combs, dual-comb ranging allows time and phase response to be measured rapidly. It breaks through the limitations related to the responsive bandwidth, ambiguity range, and dynamic measurement characteristics of conventional ranging tools. This review introduces dual-comb ranging and summarizes the key techniques for realizing this ranging tool. As optical frequency comb technology progresses, dualcomb ranging shows promise for various professional applications.

Keywords： Ranging Dual-comb interferometer Phase noise Timing jitter Tight-locking Post-correction

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A review of optically induced rotation Review Article

Qi ZHU, Nan LI, Heming SU, Wenqiang LI, Huizhu HU,huhuizhu2000@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 2, Pages 171-185 doi: 10.1631/FITEE.2000338

Abstract: The optical rotation technique arose in the 1990s. brought an ideal platform for research on the of laser beams. For decades, the optical rotation technique has been widely applied in laboratory optical manipulation and the fields of biology and optofluidics. Recently, it has attracted much attention for its potential in the classical and quantum regimes. In this work, we review the progress of experiments and applications of . First, we introduce the basic exploration of . Then, we cover the development and application of optical rotation induced by orbital , and the spin is presented. Finally, we elaborate on recent applications of the optical rotation technique in high vacuum. As precise optical manipulation in a liquid medium enters its maturity, s in high vacuum open a new path for the high-speed .

Keywords： Optical tweezer Optically induced rotation Angular momentum Micro-rotor

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Speed-up development of PV to ensure sustainable energy supply in China

Wang Sicheng

Strategic Study of CAE 2011, Volume 13, Issue 9, Pages 51-62

Abstract:

PV is never limited by resources and production materials and is the main alternative energy sources in the future. China is now the largest producer of PV modules in the world and has made remarkable cost reduction in recent years.It is expected that PV will reach "grid-parity" within 5~10 years and become market competitive with conventional electricity.Large scale utilization of PV domestically will give great help to realize the target of GHG reduction and energy sustainable development in China.We still need great efforts in incentive policies, financing and grid-connection.

Keywords： solar photovoltaics grid-parity

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The Fire Detection Technology of Multiple Gases Based on Photoacoustic Principle

Jiang Yalong,Yuan Hongyong,Zhang Yongming,Liu Yong,Zhu Yuquan,Wang Jinjun

Strategic Study of CAE 2006, Volume 8, Issue 8, Pages 69-72

Abstract:

Smoke particles and heat will be generated in fire , conventional fire detectors detect fire just by these physical effects. But the measurement of physical parameters is not enough for an early fire detection. Nowadays another method has been an area of major interest for early fire dtection which make use of the gases (for example CO) generated from combustion process to detect fire. A majority of existing gas sensors are not good for a early fire detection because of their low sensitivity. A detection method for measuring the gas concentration based on photoacoustic principle is reported in this work, which increased the sensitivity enomously. The rate of false alarm is decreased greatly also by combining carbon monoxide detection with carbon dioxide detection.

Keywords： photoacoustic fire detection multiple gas

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The Improving Characteristics of the Gradual Gaussian Multidimensional Pre-filter for Optical Flow Estimation

Fu Jun,Xu Weipu

Strategic Study of CAE 2004, Volume 6, Issue 12, Pages 56-61

Abstract:

Based on the unified estimation-theoretic framework, an effective method of using the gradual Gaussian multidimensional pre-filter to improve the optical flow estimation is presented. The pre-filtering and smoothing effect, which attenuate the temporal aliasing and the interesting signal structure of the optical flow field, are altered with adjusting the spatiotemporal standard deviation parameters. The first 50 frames of the standard Flower Garden and Football video sequence are tested as the reference image sequences, and the LK algorithm as the reference optical flow computing method. Experimental results in objective evaluation show that the optimum temporal standard deviation parameter is 0.4, the optimum spatial standard deviation parameter is in a range of 1.6～2.0 under the condition that the pre-filtering window size is 5 × 5 pixels. After pre-filtering the image sequence by the Gaussian multidimensional filter, the average PSNR of the reconstructed frames enhance 2.572 dB, higher than that using the standard optical flow computing method by nearly 13.6 % .

Keywords： optical flow computing Gaussian multidimensional filter PSNR motion estimation

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Multi-aperture optical imaging systems and their mathematical light field acquisition models Review Article

Qiming QI, Ruigang FU, Zhengzheng SHAO, Ping WANG, Hongqi FAN

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6, Pages 823-844 doi: 10.1631/FITEE.2100058

Abstract:

Inspired by the compound eyes of insects, many s have been proposed to improve the imaging quality, e.g., to yield a high-resolution image or an image with a large field-of-view. Previous research has reviewed existing s, but few papers emphasize the which is essential to bridge the gap between configuration design and application. In this paper, we review typical s (i.e., , , and ), and then summarize general mathematical s for different configurations. These mathematical models provide methods for calculating the key indexes of a specific , such as the field-of-view and sub-image overlap ratio. The mathematical tools simplify the quantitative design and evaluation of imaging systems for researchers.

Keywords： Multi-aperture optical imaging system Artificial compound eye Light field camera Camera array Light field acquisition model

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Title Author Date Type Operation

Wideband circular-polarized transmitarray for generating a high-purity vortex beam

Liangjie QIU, Xiuping LI, Zihang QI, Wenyu ZHAO, Yuhan HUANG,xpli@bupt.edu.cn

Journal Article

Wavelength-selective wavefront shaping by metasurface

Zixin CAI, Xin HE, Xin LIU, Shijie TU, Xinjie SUN, Paul BECKETT, Aditya DUBEY, Arnan MITCHELL, Guanghui REN, Xu LIU, Xiang HAO,xinhe.wins@outlook.com,guanghui.ren@rmit.edu.au,haox@zju.edu.cn

Journal Article

Light field imaging: models, calibrations, reconstructions,and applications

Hao ZHU, Qing WANG, Jingyi YU

Journal Article

Review of optical tweezers in vacuum

Nan LI, Xun-min ZHU, Wen-qiang LI, Zhen-hai FU, Meng-zhu HU, Hui-zhu HU

Journal Article

Current Situation and Prospects of the Solar Photovoltaic Industry in China

Kong Fantai, Dai Songyuan

Journal Article

On-Line Supervisory Technology for Q-Factor in the Optical Supervisory Channel of Optical Transport Network

Tang Yong,Sun Xiaohan,Zhang Mingde,Ding Dong