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Liquid Crystal Based Label-Free Optical Sensors forBiochemical Application

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Photonic Sensors 2024年第2期14卷 57-88页

作者： Jieyuan TANG Zhibin LI Mengyuan XIE Yunhan LUO Jianhui YU Guojie CHEN Zhe CHEN School of Physics and optoelectronic engineering Foshan UniversityFoshan 528225China Guangdong-Hong Kong.Macao Joint Laboratory for Intelligent Micro-Nano optoelectronic Technology Foshan UniversiyFoshan 528225China Key Laboratory of optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632.China department of optoelectronic engineering Jinan UniversityGuangzhou 510632China JiHua Laboratory Foshan 528200China

Biochemical sensors have important applications in biology,chemistry,and ***,many biochemical sensors are hampered by intricate techniques,cumbersome procedures,and the need for *** the past two decades,it has been discovered that liquid crystals can be used to achieve the optical amplification of biological *** modifying recognition molecules,a variety of label-free biochemical sensors can be ***,biochemical sensors based on the amplification of liquid crystals have become one of the most promising *** paper describes in detail the optical sensing principle of liquid crystals,sensing devices,and optical detection ***,the latest research findings are ***,the challenges and future research directions are discussed.

关键词： Optical sensor biochemistry liquid crystal label-free

Can the late dark energy parameterization reconcile the Hubble tension?

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Chinese Physics C 2024年第7期48卷 244-252页

作者：张明建陈丽杨茂友王俊美 International School for optoelectronic engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

In this study,we constructed ten dark energy models to test whether they can reconcile the Hubble tension and how much it is affected by *** establish a fair test,the models are diverse,encompassing fractional,logarithmic,exponential,and inverse exponential forms as well as several non-parameterized *** dataset we used includes the NPIPE pipeline of cosmic microwave background(CMB)power-spectrum data from Planck2020,Pantheon+samples from Supernovae Type la,and baryon acoustic *** MCMC calculations imply dark energy transferring from w-1 for the four parameterized dark energy ***,these models cannot adequately reconcile the Hubble ***,we found that phantom-like dark energy with w<-1 can achieve the greatest reduction in the Hubble tension to ***,AIC analysis indicates that this alleviation is at the cost of high *** also investigated the effect of constructions on the derivative of the equation of state dw/da,cosmic density parameter,CMB power spectrum C^(TT),and mater spectra P(k).We also found that the Hubble tension may be related to the reionization process.

关键词： dark energy Hubble tension CMB

Enhanced Flexoelectric Response from Functionally Gradient Electrets Undergoing Crumpling Deformation

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Acta Mechanica Solida Sinica 2024年第4期37卷 541-554页

作者： Jianhua Ma Jinrui Xu Jun Li Binglei Wang department of engineering Mechanics Shandong UniversityJinan250061China

Non-uniform deformation of the dielectric subjected to external forces can induce the flexoelectric effect, a phenomenon that couples electrical polarization to strain gradients. However, limited by the size effects, flexoelectricity is not significant at the macroscale and only becomes catchable at the microscale and nanoscale. In recent work, we obtained a considerable flexoelectric-like response by crumpling the dielectric embedded with charges, i.e., the electret, which significantly improved the flexoelectric effect at the macroscale. In this work, we further optimize the macroscopic performance of the flexoelectric response by applying gradient treatment to the electret films. Specifically, we analytically derive the electromechanical coupling of crumpled electret films with gradients of different thicknesses, charge densities, and Young’s moduli as key design variables. It is shown that the gradient-oriented electret film can be tuned to nearly five times that of a uniform electret film.

关键词： Functionally gradient electret Size effects Crumpling Flexoelectric-like response

New Insight into the Flexoelectricity in the View of Mechanics of Materials:Prismatic Beams Subjected to Bending

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Acta Mechanica Solida Sinica 2024年第4期37卷 555-569页

作者： Xu Yang Lingling Chen Shengyou Yang department of engineering Mechanics School of Civil EngineeringShandong UniversityJinan250061China

Flexoelectricity is a fascinating electromechanical phenomenon that occurs in non-homogeneously deformed dielectric *** piezoelectricity,the flexoelectric effect is highly dependent on both the material scale and the deformation *** several theoretical models have been proposed to explain the mechanism of flexoelectricity,these models can be rather complicated for those who are interested in studying the *** paper aims to simplify the understanding of flexoelectricity by focusing on the bending behavior of a prismatic dielectric beam from a mechanics of material *** avoid using complicated mathematical formulations based on continuum mechanics,including advanced tensor algebra and calculus of *** formulation clearly explains how inhomogeneous deformations and material size affect the electromechanical coupling,changing the effective bending stiffness,deflection,and rotation angles of a bending *** hope this paper can help undergraduate students and researchers,who are unfamiliar with the electromechanical coupling in flexoelectricity,to develop an understanding of this phenomenon and encourage further research in this area.

关键词： bending formulation dielectric

In situ photoelectric biosensing based on ultranarrowband near-infrared plasmonic hot electron photodetection

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Advanced Photonics 2024年第2期6卷 81-89页

作者： Xianghong Nan Wenduo Lai Jie Peng Haiquan Wang Bojun Chen Huifan He Zekang Mo Zikun Xia Ning Tan Zhong Liu Long Wen Dan Gao Qin Chen jinan university College of Physics & Optoelectronic Engineering Institute of Nanophotonics Guangdong Provincial Key Laboratory of Nanophotonic Manipulation Tsinghua university Shenzhen International Graduate School State Key Laboratory of Chemical Oncogenomics jinan university College of Life Science and Technology

Narrowband photodetection is an important measurement technique for material analysis and sensing, for example, nondispersive infrared sensing technique. Both photoactive material engineering and nanophotonic filtering schemes have been explored to realize wavelength-selective photodetection,while most devices have a responsive bandwidth larger than 2% of the operating wavelength, limiting sensing performance. Near-infrared photodetection with a bandwidth of less than 0.2% of the operating wavelength was demonstrated experimentally in Au/Si Schottky nanojunctions. A minimum linewidth of photoelectric response down to 2.6 nm was obtained at a wavelength of 1550 nm by carefully tailing the absorptive and radiative loss in the nanostructures. Multiple functions were achieved on chip with the corrugated Au film, including narrowband resonance, light harvesting for sensing and photodetection, and electrodes for hot electron emission. Benefiting from such a unity integration with in situ photoelectric conversion of the optical sensing signal and the ultranarrowband resonance, self-contained on-chip biosensing via simple intensity interrogation was demonstrated with a limit of detection down to 0.0047%in concentration for glucose solution and 150 ng∕m L for rabbit IgG. Promising potential of this technique is expected for the applications in on-site sensing, spectroscopy, spectral imaging, etc.

关键词： Photodetectors Plasmonics Biosensing Optical gratings Gold Absorption spectrum Acoustooptic tunable filters Absorption Sensors In situ remote sensing

Design and calibration of spoke piezoelectric six-dimensional force/torque sensor for space manipulator

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Chinese Journal of Aeronautics 2024年第1期37卷 218-235页

作者： Yingjun LI Guicong WANG Shuai ZHANG Yuanqin ZHOU Hongyu LI Zhenguang QI School of Mechanical engineering University of JinanJinan 250022China

The large manipulator outside the space cabin is a multi-degree of freedom actuator for space *** order to realize the automatic control and flexible operation of the space manipulator,a novel spoke structure piezoelectric six-dimensional force/torque sensor with redundancy ability,high stiffness and good decoupling performance is innovatively *** on the deformation coordination relationship,the redundancy measurement mechanism is *** mathematical models of the sensor with and without branch fault are established *** finite element model is established to verify the feasibility of structure and redundancy measuring principle of the *** on the theoretical analysis and simulation analysis,the prototype of the sensor is *** and dynamic calibration experiments are carried *** actual output voltage signal of the six-dimensional force/torque sensor is collected to establish the equation between the standard input applied load and the actual output voltage *** on ant colony optimized BP algorithm,performance indexes of the sensor with and without branch fault are analyzed *** experimental results show that the spoke piezoelectric sixdimensional force/torque sensor with the eight-point support structure has good accuracy and ***,it has strong decoupling characteristic that can effectively shield the coupling between *** nonlinear errors and maximum interference errors of decoupled data with and without branch faults are less than 1% and 2%,*** natural frequency of the sixdimensional force sensor can reach 2856.45 Hz and has good dynamic *** research content lays a theoretical and experimental foundation for the design,development and application of the new six-dimensional force/torque sensors with ***,it will significantly improve the research level in this field,and provide a strong guarantee for the smoot

关键词： Decoupling algorithm Piezoelectric Redundancy Six-dimensional force/torque sensor Space manipulator

Optical edge-to-screw singularity state conversions

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Photonics Research 2024年第8期12卷 1689-1695页

作者： HAOLIN LIN JUNHUI JIA GUOHUA LIU YANWEN HU ZHEN LI ZHENQIANG CHEN SHENHE FU department of optoelectronic engineering Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632China Guangdong Provincial engineering Research Center of Crystal and Laser Technology Guangzhou 510632China

Optical singularity states,which significantly affect propagation properties of light in free space or optical medium,can be geometrically classified into screw and edge *** different types of singularity states do not exhibit direct connection,being decoupled from each other in the absence of external *** we demonstrate a novel optical process in which a higher-order edge singularity state initially nested in the propagating Gaussian light field gradually involves into a screw singularity with a new-born topological charge determined by order of the edge *** considered edge state comprises an equal superposition of oppositely charged vortex and antivortex *** theoretically and experimentally realize this edge-to-screw conversion process by introducing intrinsic vortex–antivortex *** also present a geometrical representation for mapping this dynamical process,based on the higher-order orbital Poincaré*** this framework,the edge-to-screw conversion is explained by a mapping of state evolution from the equator to the north or south pole of the Poincaré*** demonstration provides a novel approach for manipulating singularity state by the intrinsic vortex–antivortex *** presented phenomenon can be also generalized to other wave systems such as matter wave,water wave,and acoustic wave.

关键词： interaction Poincaré wave

High-efficiency Brillouin lasing in a planar GeSbS spiral-ring resonator

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Chinese Optics Letters 2024年第7期22卷 71-76页

作者： Jingcui Song Yuhang Wei Chunxu Wang Shuixian Yang Yan Li Tianhua Feng Xiaojie Guo Zhaohui Li Guangdong Provincial Key Laboratory of optoelectronic Information Processing Chips and Systems and School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510006China Peng Cheng Laboratory Shenzhen 518000China department of Electronic engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China College of Physics and optoelectronic engineering Jinan UniversityGuangzhou 510632China Southern Marine Science and engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

Stimulated Brillouin scattering in planar integrated circuits promises to realize compact and highly coherent *** we report efficient Brillouin lasing at telecommunication wavelength from a planar Ge_(25)Sb_(10)S_(65) chalcogenide(ChG)resonator with a high quality factor above 106.A low lasing threshold of 24.8 mW is achieved with a slope efficiency of 8.3%.An 8-kHz linewidth is measured for 1.56-mW on-chip output *** work offers a good opportunity to enrich the versatility and functionality of the ChG photonics on account of their intrinsic advantages of low loss,high third-order nonlinearity,and potential capacity for wafer-scale fabrication.

关键词： Brillouin lasing chalcogenide photonics planar integrated circuit high-Q resonator

Coordinatively unsaturated cobalt single-atom nanozymes for visual pesticides detection by smartphone-based platform

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Nano Research 2024年第4期17卷 2298-2307页

作者： Fangning Liu Zhe Li Hengya Wei Peng Xu Ge Kang Shicheng Zhu Tingting Wang Ruxue He Chuanxia Chen Yizhong Lu School of Materials Science and engineering University of JinanJinan 250022China

By adjusting the coordination environment of single-atom catalysts,the enzyme-like activity can be finely tuned for highly sensitive ***,we demonstrated that coordinatively unsaturated cobalt-nitrogen sites doped within porous carbon(SA-CoN_(3))could serve as highly efficient oxidase *** with the typical planar four-coordination structure(SA-CoN_(4)),the as-obtained single-atom Co nanozymes anchored by three nitrogen atoms are found to display much higher oxidase-like catalytic *** theoretical and experimental analysis revealed that the coordinatively unsaturated Co sites could facilitate adsorption and activation of O_(2) molecule and thus improve their oxidase-like *** on the enhanced oxidase-like activity of SA-CoN_(3),a paper/smartphone sensor for organophosphorus pesticides(OPs)was successfully constructed and used to quantify glyphosate in environmental and food samples with a low detection limit of 0.66μ*** work not only highlights the important role of coordination unsaturation of SA nanozymes for promoting oxidase-like activity,but also provides an easy and cost-effective way to conduct effective quantification of OPs in the field.

关键词： single-atom nanozymes asymmetric organophosphorus pesticides oxygen adsorption smartphone