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2023 Applied Optics and Photonics China: AI in Optics and Photonics, AOPC 2023

作者： Wu, Xianzhi Zhang, Lingjie Zhang, Zhiyao Zhang, Shangjian Liu, Yong State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Research Center for Microwave Photonics School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China

ISBN: (纸本)9781510672383

Performance improvement of microwave photonic frequency down-conversion link is investigated both in simulation and experiment. To achieve maximum signal-To-noise ratio, a dual-drive Mach-Zehnder modulator (DDMZM) biased at the minimum transmission point and an erbium-doped fiber amplifier (EDFA) are employed to boost the power of the first-order modulation sidebands. The power spectrum density of the output noise is limited by the thermal noise and relative intensity noise (RIN) with low and high gain of EDFA, respectively. Correspondingly, the output noise figure (NF) decreases rapidly in the case of a thermal-noise-dominant noise floor and remains stable in RIN-dominant noise floor situations. When the local oscillation (LO) and the radio frequency (RF) signal powers are set to be 10 dBm and the input optical power before photodetector (PD) is amplified to be 20 dBm, an intermediate frequency signal with a high power of 10.8 dBm is obtained. When LO/RF power is set to be 0 dBm and the amplified optical power entering the PD is 16 dBm, the NF of the proposed link is measured as 31.5 dB, which is 14 dB lower than the link without EDFA, while the conversion gain has improved to 12 dB with an increase of 57.2 dB. Finally, the spurious-free dynamic range of the link is measured as 113.3 dB·Hz 2/3 when the power of the LO signal is 0 dBm and the gain of EDFA is 18 dB. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Noise figure

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Lung nodule CT medical image analysis based on deep learning

Lung nodule CT medical image analysis based on deep learning

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2022 Applied Optics and Photonics China: AI in Optics and Photonics, AOPC 2022

作者： Cai, Yuwei Chen, Ruiquan Liu, Hao Peng, Zheng Yuan, Yufeng Lu, Yuan Peng, Xiao College of Physics and Optoelectronic Engineering Shenzhen Key Laboratory of Photonics and Biophotonics Key Laboratory of Optoelectronic Devices and Systems Ministry of Education and Guangdong Province Shenzhen University Shenzhen518060 China School of Electronic Engineering and Intelligentization Dongguan University of Technology Dongguan523808 China Huazhong University of Science and Technology Union Shenzhen Hospital The 6th Affiliated Hospital Shenzhen University Health Science Center Shenzhen518052 China

ISBN: (纸本)9781510662407

In recent years, lung cancer has become one of the most lethal factors to human beings. Clinical data show that the probability of lung nodules developed into lung cancer is about 30%. Due to the lack of obvious symptoms, around 70% of lung cancer patients in China are in advanced stage of lung cancer when firstly diagnosed. Therefore, early identification of lung nodules is of great significance for early diagnosis and therapy. Currently, artificial intelligence has been widely used to generate predictive model of lung nodules by learning algorithms adapted to image characteristics, leading to improved accuracy and higher sensitivity of diagnosis of early lung cancer. In this work, Luna16 (lung nodule analysis 2016, containing a total of 888 low-dose chest Computed Tomography (CT) thin-slice plain scan lesions) were selected as the data set, providing a total of 1018 CT slices with the most representative shape of lung nodules in this analysis. Next, this project was performed on Baidu AI Studio platform, applying both U-Net and PSP Net to train a model of rapid detection of lung nodules. The training process generated a model providing a rapid and accurate identification of lung nodules larger than 3 mm in diameter. Results showed that the accuracy of U-Net was higher than that of PSP Net, indicating a high potential in further clinical diagnosis in lung cancer. © 2023 SPIE.

关键词： Diseases

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Bias-Independent Inter-Modulation Method for Simultaneously Measuring Low-Frequency Modulation and Bias Half-Wave Voltages of Mach-Zehnder Modulators

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Photonic Sensors 2023年第2期13卷 30-36页

作者： Junfeng ZHU Xinhai ZOU Ying XU Yutong HE Yali ZHANG Zhiyao ZHANG Shangjian ZHANG Yong LIU Advanced Research Center for Microwave Photonics(ARC-MWP) State Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China

A bias-independent inter-modulation method is proposed and demonstrated for measuring low-frequency modulation and bias half-wave voltages of Mach-Zehnder modulators(MZMs).The method consists of simultaneous sinusoidal modulation on the modulation and bias ports of the MZM under ***-modulated sidebands heterodyne with each other and generate the desired inter-modulation products after photodetection,which allows extracting both the modulation depth and half-wave voltage for the modulation and bias ports of the *** method is independent of bias voltages of the MZM,which can be canceled out by carefully choosing the sinusoidal-modulation ***,the proposed method enables the low swing voltage for measuring both the modulation depth and half-wave voltage of *** indicate that the proposed method features the simple setup and high accuracy for low-frequency response measurement ranging from 1 Hz to 1 MHz.

关键词： Electrooptical modulation fiber optics systems half-wave voltage inter-modulation

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Dual-demodulation large-scope high-sensitivity refractive index sensor based on twin-core PCF

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optoelectronics Letters 2021年第4期17卷 193-198页

作者： LI Chen-yuan SONG Bin-bin WU Ji-xuan HUANG Wei WU Xu-jie JIN Chang The Key Laboratory of Computer Vision and System of Ministry of Education Tianjin Key Laboratory of Intelligence Computing and Novel Software TechnologyTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems College of Electronic and Information EngineeringTiangong UniversityTianjin 3003S7China

In this paper, a refractive index(RI) sensor based on the twin-core photonic crystal fiber(TC-PCF) is presented. Introducing the rectangular array in the core area makes the PCF possible to obtain high birefringence and low confinement loss over the wavelength range from 0.6 μm to 1.7 μm. Therefore, the core region can enhance the interaction between the core mode and the filling material. We studied theoretically the evolution characteristics of the birefringence and operating wavelength corresponding to the strongest polarization point under the condition of filling the rectangular array with RI matching fluid range from 1.33 to 1.41. Simulation results reveal that the proposed TC-PCF has opposite evolutions of change rates between the B and wavelength, and the maximum RI sensing sensitivities of 1.809× 10-2 B/RIU and 8 700 nm/RIU at low and high RI infill are obtained respectively, which means that the TC-PCF features of dual-parameter demodulation for the RI sensing can maintain a high refractive index sensing sensitivity within a large scope of RI ranging from 1.33 to 1.41. Compared with the results of single-parameter demodulation, it is an optimized method to improve the sensitivity of low refractive index sensors, which has great application potency in the field of biochemical sensing and detection.

关键词： polarization refractive index

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Simulation Design of a Low Noise Amplifier with 2.5 GHz Operating Frequency 1

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11th International Conference on Communications, Signal Processing, and Systems, CSPS 2022

作者： Wang, Hai Sun, Guiling Wang, Zhihong Zhang, Yi Jiang, Xiaomei Zhang, Ying Teaching Center for Experimental Electronic Information College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Department of Electronic Information Science and Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Institute of Photoelectronic Thin Film Devices and Technology and Tianjin Key Laboratory of Thin Film Devices and Technology Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300071 China

ISBN: (数字)9789819926534

ISBN: (纸本)9789819926527

Nowadays the wireless communication infrastructure industry is facing with a number of great challenges, such as providing better signal quality and wider coverage in a crowded spectrum. Low noise amplifier (LNA), a significant component of communication system, plays an important role in modern wireless communication, radar, electronic countermeasure system between countries and so on. The sensitivity performance of the base station receiver can be dramatically improved by a suitable amplifier, especially the first stage LNA. In this paper, a low noise amplifier with an operating frequency of 2.5 GHz is designed with the help of the simulation software. The minimum values of input return loss S11 and output return loss S22 are −19.232 dB and −29.422 dB respectively. The maximum gain is 14.567 dB at the center frequency. Besides, the stability coefficient K is greater than 1 and the noise figure (NF) is 0.662 dB. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Low noise amplifiers

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Waterborne Polyurethanes with Novel Chain Extenders Bearing Multiple Sulfonate Groups

SSRN

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SSRN 2023年

作者： Xia, Cuozheng Hu, Jinkang Chen, Chi Wang, Xin Zhu, Chao Mu, Youbing Wan, Xiaobo Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of Education School of Optoelectronic Materials & Technology Jianghan University Wuhan430056 China

The anionic chain extenders used in the waterborne polyurethane (WPU) synthesis generally contain one anionic ion per extender. Increasing its content in WPU makes the WPU emulsion more stable, however also makes the WPU film more water sensitive, which is a dilemma to be solved for the wide application of WPU. Herein, a novel class of anionic chain extenders bearing multiple sulfonate groups is rationally designed. The multiple ionic groups enhance the ion strength of chain extender and regulate the distribution of ionic charges on the resulting WPU. The relationship between the structure of the chain extenders and the properties of WPU is studied systematically. The results show that the critical percentage of the extender containing more anionic groups needed to form stable emulsion is largely reduced, not in a proportional way. Hence the overall hydrophilic segments on the WPU backbone is greatly decreased, which make the WPU more water resistant without sacrificing the emulsification capability of WPU. Among them, the threshold to form stable emulsion for WPU made from the ether-type chain extender containing four sulfonates is as low as 1.2 mol%, and the water absorption of the resultant film is only 3.5%. In addition, the local aggregation of ionic charges derived from the chain extenders bearing multiple sulfonate groups can significantly enhance the thermodynamic and mechanical properties of the resulting films. This provides a new strategy for regulating the performance of WPU, and also afford a feasible route to solve the problems existing in WPU. © 2023, The Authors. All rights reserved.

关键词： Polyurethanes

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Symmetry breaking and mechanical filter make a pseudo-gimbal-less two-dimensional MEMS scanning mirror with multiple scanning modes

arXiv

引用

arXiv 2023年

作者： Wang, Weimin Key Laboratory of Optoelectronic Technology and Systems Ministry of Education Defense Key Disciplines Laboratory of Novel Micro-Nano Devices and System Technology College of Optoelectronic Engineering Chongqing University Chongqing400044 China

Miniaturized two-dimensional scanning mirror based on microelectromechanical systems (MEMS) technology has great potential in automotive industry, consumer electronics, and biomedicine, etc. Due to its high frequency and large angle, resonant scanning is the mainstream in all MEMS actuation mechanisms, such as harmonic resonant electromagnetic scanner and parametric resonant electrostatic scanner. Although electrostatic scanner has the advantages of low power consumption and IC process compatibility, some shortcomings of parametric resonance, including double frequency of driver electronics and additional feedback control or frequency stabilization system, limit its further application. The symmetry of coplanar electrostatic comb actuator is broken in this paper, and harmonic resonant electrostatic scanner with excellent performance is realized. Further, through adopting mechanical filter, two-dimensional scanning can be achieved through one set of actuators, which avoids the problem that two sets (each for one dimension) of electrostatic actuators must be insulated each other through complicated and expensive processes. A two-dimensional MEMS scanner based on symmetry breaking and mechanical filter was proposed and demonstrated. Multiple scanning modes can be achieved through selective control of a set of four identical actuators. Copyright © 2023, The Authors. All rights reserved.

关键词： Electrostatics

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Designing of anisotropic gradient surfaces for directional liquid transport:Fundamentals,construction,and applications

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The Innovation 2023年第6期4卷 115-131页

作者： Lanlan Hou Xiaofei Liu Xinran Ge Rongjun Hu Zhimin Cui Nu WangYong Zhao Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Minitry of Education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China School of Printing and Packaging Engineer Beijing Institute of Graphic CommunicationBeiing 102600China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBejjing 100190China Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330096China

Many biological surfaces are capable of transporting liquids in a directional manner without energy *** by nature,constructing asymmetric gradient surfaces to achieve desired droplet transport,such as a liquid diode,brings an incredibly valuable and promising area of research with a wide range of *** by advances in nano-technology and manufacturing techniques,biomimetics has emerged as a promising avenue for engineering various types of anisotropic material *** the past few decades,this approach has yielded significant progressin both fundamental understanding and practical *** studies revealed that the heterogeneous composition and topography mainly govern the wetting mechanisms and dynamics behavior of droplets,including the interdisciplinary aspects of materials,chemistry,and *** this review,we provide a concise overview of various biological surfaces that exhibit anisotropic droplet *** discussed the theoretical foundations and mechanisms of droplet motion on designed surfaces and reviewed recent research advances in droplet directional transport on designed plane surfaces and Janus *** liquid-diode materials yield diverse promising applications,involving droplet collection,liquid separation and delivery,functional textiles,and biomedical *** also discuss the recent challenges and ongoing approaches to enhance the functionality and application performance of anisotropic materials.

关键词： anisotropic directional gradient

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Simultaneously Optimizing Molecular Stacking and Phase Separation via Solvent-Solid Hybrid Additives Enables Organic Solar Cells with over 19%Efficiency

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Chinese Journal of Chemistry 2024年第24期42卷 3234-3242页

作者： Haicui Liu Keli Shi Jing Lai Seonghun Jeong Can Zhu Jinyuan Zhang Zhi-Guo Zhang Changduk Yang Beibei Qiu Yongfang Li Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information EngineeringZhejiang Normal UniversityJinhuaZhejiang 321004China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China School of Energy and Chemical Engineering Perovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)50 UNIST-gilUlju-gunUlsan 44919South Korea

Given the crucial role of film morphology in determining the photovoltaic parameters of organic solar cells(OSCs),solvent or solid additives have been widely used to realize fine-tuned film morphological features to further improve the performance of ***,most high-performance OSCs are processed only using single component additive,either solvent additive or solid ***,a simple molecular building block,namely thieno[3,4-b]thiophene(TT),was utilized as the solid additive to coordinate with the widely used solvent additive,1-chloronaphthalene(CN),to modulate the film *** investigations revealed that the addition of TT could prevent the excessive aggregation to form a delicate nanoscale phase separation,leading to enhanced charge transport and suppressed charge recombination,as well as superior photovoltaic ***,the PM6:Y6 based OSCs with the addition of hybrid additive of CN+TT demonstrated the optimal PCE of 18.52%,with a notable FF of 79.6%.More impressively,the PM6:Y6:PC71BM based ternary OSCs treated with the hybrid additives delivered a remarkable efficiency of 19.05%,which ranks among the best values of Y6-based OSCs reported so *** work highlights the importance of the hybrid additive strategy in regulating the active layer morphology towards significantly improved performance.

关键词： Organic solar cells Morphology regulation Solid additive Synergistic effects Photovoltaic properties

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Chiroptical responses modulated by competitions between structural chiralities and magnetizations

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Physical Review A 2024年第6期109卷 063502-063502页

作者： Chunchao Wen Jianfa Zhang Chaofan Zhang Shiqiao Qin Zhihong Zhu Wei Liu College for Advanced Interdisciplinary Studies National University of Defense Technology Changsha 410073 China Nanhu Laser Laboratory Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense Technology Changsha 410073 China

We study chiroptical scattering properties of magneto-optical structures possessing rotation symmetries, with both rotation axis and externally applied static magnetic field parallel to the incident direction. For no less than threefold rotation symmetries (with or without magnetizations), cross sections of scattering and extinction are invariant as long as the incident polarizations locate on the same latitude line of the Poincaré sphere (polarization ellipses of the same ellipticity but different orientations), while for general incident polarizations, cross sections of scattering and extinction are ellipticity-weighted arithmetic average of those for circularly polarized incident waves. We further characterize the chiroptical responses through relative distinctions between cross sections for incident waves of left-handed and right-handed circular polarizations, and reveal that the external magnetic field can both suppress and enhance the chiroptical responses, depending on its direction and strength. When the chiroptical response is fully eliminated by the magnetization, the cross sections get decoupled to the polarization ellipticities as well, becoming fully independent of arbitrary incident polarizations. Our arguments are based on global structural symmetries only, and thus all conclusions drawn are irrelevant to local geometric parameters or specific material parameters of the scatterers, as long as the rotation symmetry is preserved. The principles we have revealed can be applied in many magnetism-induced nonreciprocal structures, and are robust against any rotation-symmetry-preserving structural defects and perturbations.

关键词： Chirality Magneto-optical effect Mie scattering Light scattering

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