Kaiyuan Zhang

State Key Laboratory of Polymer Physics and Chemistry

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Shumeng Wang

Changchun Institute of Applied Chemistry

Xingdong Wang

State Key Laboratory of Polymer Physics and Chemistry

Lixiang Wang

State Key Laboratory of Polymer Physics and Chemistry

Li Guo

East China University of Science and Technology

Yanqing Yang

Washington University in St. Louis

Hua Feng

Army Medical University

Denis Denisov

University of Manchester

Wei Wu

Fujian Agriculture and Forestry University

Shiyang Shao

Hainan University

Lixiang Wang

State Key Laboratory of Polymer Physics and Chemistry

Cooperative Institutions

Chinese Academy of Sciences

Tsinghua University

State Key Laboratory of Polymer Physics and Chemistry

Changchun Institute of Applied Chemistry

University of Science and Technology of China

University of Chinese Academy of Sciences

Northwestern Polytechnical University

Shandong University

Weihai Science and Technology Bureau

State Key Laboratory of New Ceramics and Fine Processing

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Homogeneous optimization approach for reducing sensitivity of an optical lens system

Optical Engineering (2020)

Kaiyuan Zhang Fujian Dai Zhengyang Li

During the production of a lens system, the assembling and manufacturing tolerances must be accurately controlled to ensure production efficiency. Thus, it is important to analyze and optimize the tolerance sensitivity of the lens system during the optical design phase to reduce optical performance degradation. We proposed an approach for appropriately controlling the tolerance sensitivity of a lens system. The proposed sensitivity optimization method can homogenize image performance for the same field under different tolerance values. Based on the results, we show that the implementation of the proposed method sharply reduces sensitivity and, consequently, improves the product yield rate by 15 to 17% compared with a traditional optimization method. As a practical example, a 40-megapixel f1.8 mobile phone camera lens design and optimization process was performed in our study. Our preliminary experimental results confirm that the proposed method is effective to reduce the optical sensitivity of the camera lens.

Tolerance Analysis

Degradation

Optical engineering

Microlens

10.1117/1.oe.59.3.035109

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Citations (2)

<p>An organic NIR-II nanofluorophore with aggregation-induced emission characteristics for in vivo fluorescence imaging</p>

International Journal of Nanomedicine (2019)

Wei Wu Yanqing Yang Yang Yang Yuming Yang Hong Wang

Background: In vivo fluorescence imaging in the second near-infrared (NIR-II, 1000-1700 nm) window using organic fluorophores has great advantages, but generally suffers from a relatively low fluorescence quantum yield (mostly less than 2%). In this study, organic nanoparticles (L1013 NPs) with a high fluorescence quantum yield (9.9%) were systhesized for in vivo imaging. Methods: A molecule (BTPPA) with donor-acceptor-donor structure and aggregation-induced emission enabling moieties was prepared. BTPPA molecules were then encapsulated into nanoparticles (L1013 NPs) using a nanoprecipitation method. The L1013 NPs were intravenously injected into the mice (including normal, stroke and tumor models) for vascular and tumor imaging. Results: L1013 NPs excited at 808 nm exhibit NIR-II emission with a peak at 1013 nm and an emission tail extending to 1400 nm. They have a quantum yield of 9.9% and also show excellent photo/colloidal stabilities and negligible in vitro and in vivo toxicity. We use L1013 NPs for noninvasive real-time visualization of mouse hindlimb and cerebral vessels (including stroke pathology) under a very low power density (4.6-40 mW cm‒2) and short exposure time (40-100 ms). Moreover, L1013 NPs are able to localize tumor pathology, with a tumor-to-normal tissue ratio of 11.7±1.3, which is unusually high for NIR-II fluorescent imaging through passive targeting strategy. Conclusion: L1013 NPs demonstrate the potential for a range of clinical applications, especially for tumor surgery.

Quantum yield

Fluorescence-lifetime imaging microscopy

10.2147/ijn.s198587

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A Dual-Band High-Gain Subwavelength Cavity Antenna with Artificial Magnetic Conductor Metamaterial Microstructures

Micromachines (2021)

Guang Lu Fabao Yan Kaiyuan Zhang Yunpeng Zhao Lei Zhang

This paper presents dual-band high-gain subwavelength cavity antennas with artificial magnetic conductor (AMC) metamaterial microstructures. We developed an AMC metamaterial plate that can be equivalent to mu-negative metamaterials (MNMs) at two frequencies using periodic microstructure unit cells. A cavity antenna was constructed using the dual-band AMC metamaterial plate as the covering layer and utilizing a feed patch antenna with slot loading as the radiation source. The antenna was fabricated with a printed circuit board (PCB) process and measured in an anechoic chamber. The |S11| of the antenna was -26.8 dB and -23.2 dB at 3.75 GHz and 5.66 GHz, respectively, and the realized gain was 15.2 dBi and 18.8 dBi at two resonant frequencies. The thickness of the cavity, a sub-wavelength thickness cavity, was 15 mm, less than one fifth of the long resonant wavelength and less than one third of the short resonant wavelength. This new antenna has the advantages of low profile, light weight, dual-frequency capability, high gain, and easy processing.

Metamaterial antenna

Multi-band device

Anechoic chamber

10.3390/mi13010058

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Citations (7)

The TEM Original Curves of V8-system Realized by MATLAB Program

Science and Technology of West China (2013)

Kaiyuan Zhang

In the exploration of TEM sounding,decay curves and late time apparent resistivity curves as the original data are core contents in the field data acceptance.However,the pre-processing software compatible with instrument often cannot generate batches of maps.Technicians need to screenshot from the software,which is not only tedious,but also lack of the corresponding concerned information.By reading USF data through the MATLAB program,the batch production of the original curves and the comparative analysis of data can both be realized.

Data Processing

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Benzimidazole based electron-transport hosts for efficient pure blue narrowband OLED device

Organic Electronics (2024)

Yuliang Wu Mengyu Wang Kaiyuan Zhang Xianghui Tian Shumeng Wang

Benzimidazole

Narrowband

10.1016/j.orgel.2024.107120

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Markov chains in the domain of attraction of Brownian motion in cones

arXiv (Cornell University) (2023)

Denis Denisov Kaiyuan Zhang

We consider a multidimensional Markov Chain $X$ converging to a multidimensional Brownian Motion. We construct a positive harmonic function for $X$ killed on exiting the cone. We show that its asymptotic behavior is similar to that of to the harmonic function of Brownian motion. We use the harmonic function to study the asymptotic behaviour of the tail distribution of the exit time $\tau$ of $X$ from a cone.

Harmonic

10.48550/arxiv.2309.16311

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High Performance, Biocompatible Dielectric Thin‐Film Optical Filters Integrated with Flexible Substrates and Microscale Optoelectronic Devices

Advanced Optical Materials (2018)

Changbo Liu Qianyi Zhang Dan Wang Guanlei Zhao Xue Cai

Abstract Miniaturized, wearable, and implantable optoelectronic devices and systems provide incomparable opportunities for applications in biomedical fields. Optical filters with wavelength selective reflective/transmissive responses that can be integrated onto these biointegrated platforms are critically important for high performance operation. Here, high quality, dielectric thin‐film optical filters on unconventional substrates via transfer printing are reported. Designed filters formed on flexible substrates exhibit highly spectral selective transmission and reflection, with the maximum optical density at stop band reaching 6. Additionally, freestanding filter membranes are combined with microscale optoelectronic devices, achieving enhanced emission intensity for light‐emitting diodes and spectral sensitivity for photovoltaic detectors. Finally, their in vitro cytotoxicity is evaluated within cell culture, and in vivo biocompatibility is supported in living animals. The presented results offer viable routes to high performance optical components for advanced biointegrated optoelectronic systems.

Microscale chemistry

10.1002/adom.201800146

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Citations (30)

Highly Red Emissive Conjugated Homopolymers Based on Double B←N Bridged Bipyridine Unit

Chinese Journal of Polymer Science (2024)

Yuyue Gao Kaiyuan Zhang Shu-Meng Wang Hui Tong Jun Liu

Bipyridine

2,2'-Bipyridine

10.1007/s10118-024-3123-7

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A facile synthesis of CF₃-containing iminoisobenzofurans via copper-catalyzed oxygen trifluoromethylation–cyclization of o-vinyl-N-alkylamide

RSC Advances (2025)

Shuo Gao Qiwang Zhou Zilin Liu Sishen Xie Di Yang

A copper-catalyzed oxygen trifluoromethylation of o -vinyl- N -alkylamide using Togni reagent as the trifluoromethyl precursor is demonstrated for the efficient synthesis of trifluoromethyl-containing iminoisobenzofurans.

Trifluoromethylation

10.1039/d4ra07978g

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MCG METHOD TO FIND DIFFERENT CONSTRAINED SOLUTION OF SPECIAL DOUBLE-VARIABLE MATRIX EQUATIONS

Journal of Mathematics (2012)

Kaiyuan Zhang

This paper studies the method of finding different constrained solutions in the problem of constrained matrix equations.By modified conjugate gradient method and Choosing special initial matrix,different constrained solutions of special double-variable linear matrix equations is obtained,and the unique least-norm solution of the system is got.Theoretical proof and numerical examples show the finite-step convergence of the method,which extend the application of modified conjugate gradient method in solving constrained matrix equations.

Matrix (chemical analysis)

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