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optical anapole modes in hybrid metal–dielectric nanoantenna for near-field enhancement and optical sensing

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Chinese Physics B 2023年第11期32卷 296-305页

作者：王德宝吕靖薇刘伟任艳茹李薇许鑫辰刘超朱剑豪 School of Physics and Electronic Engineering Northeast Petroleum UniversityDaqing 163318China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China

Metal–dielectric nanostructures in the optical anapole modes are essential for light–matter interactions due to the low material loss and high near-field enhancement. Herein, a hybrid metal–dielectric nanoantenna composed of six wedgeshaped gold(Au) nanoblocks as well as silica(SiO2) and silicon(Si) nanodiscs is designed and analyzed by the finite element method(FEM). The nanoantenna exhibits flexibility in excitation and manipulation of the anapole mode through the strong coupling between the metal and dielectrics, consequently improving the near-field enhancement at the gap. By systematically optimizing the structural parameters, the electric field enhancement factors at wavelengths corresponding to the anapole modes(AM1 and AM2) can be increased to 518 and 1482, respectively. Moreover, the nanoantenna delivers great performance in optical sensing such as a sensitivity of 550 nm/RIU. The results provide guidance and insights into enhancing the coupling between metals and dielectrics for applications such as surface-enhanced Raman scattering and optical sensing.

关键词： light-matter interaction metal-dielectric nanoantenna anapole mode electric field enhancement optical sensing

High-throughput phenotyping of plant leaf morphological, physiological,and biochemical traits on multiple scales using optical sensing

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The Crop Journal 2023年第5期11卷 1303-1318页

作者： Huichun Zhang Lu Wang Xiuliang Jin Liming Bian Yufeng Ge College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037JiangsuChina Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of AgricultureBeijing 100081China College of Forestry Nanjing Forestry UniversityNanjing 210037JiangsuChina Co-Innovation Center for Sustainable Forestry in Southern China and Key Laboratory of Forest Genetics&Biotechnology of the Ministry of Education Nanjing Forestry UniversityNanjing 210037JiangsuChina Department of Biological Systems Engineering University of Nebraska-LincolnNE 68583USA

Acquisition of plant phenotypic information facilitates plant breeding, sheds light on gene action, and can be applied to optimize the quality of agricultural and forestry products. Because leaves often show the fastest responses to external environmental stimuli, leaf phenotypic traits are indicators of plant growth,health, and stress levels. Combination of new imaging sensors, image processing, and data analytics permits measurement over the full life span of plants at high temporal resolution and at several organizational levels from organs to individual plants to field populations of plants. We review the optical sensors and associated data analytics used for measuring morphological, physiological, and biochemical traits of plant leaves on multiple scales. We summarize the characteristics, advantages and limitations of optical sensing and data-processing methods applied in various plant phenotyping scenarios. Finally, we discuss the future prospects of plant leaf phenotyping research. This review aims to help researchers choose appropriate optical sensors and data processing methods to acquire plant leaf phenotypes rapidly,accurately, and cost-effectively.

关键词： Leaf traits optical sensing Image processing Machine learning Artificial intelligence

Microfluidic-directed magnetic controlling supraballs with multi-responsive anisotropic photonic crystal structures

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Journal of Materials Science & Technology 2021年第22期81卷 203-211页

作者： Lu-Wei Hao Ji-Dong Liu Qing Li Ren-Kun Qing Yun-Ya He Jiazhuang Guo Ge Li Liangliang Zhu Chen Xu Su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu Key Laboratory of Fine Chemicals and Functional Polymer MaterialsNanjing Tech University5 Xin Mofan RoadNanjing210009China State Key Laboratory of Pharmaceutical Biotechnology and School of Life Sciences Nanjing UniversityNanjing 210023China

The design and fabrication of anisotropic photonic crystal supraballs with multiple responses are highly desirable for versatile environmental sensing and flexible ***,we developed an available strategy to construct a series of multi-responsive magnetic colloidal photonic crystal(CPC)supraballs with Janus and molecular-analogue ***,the humidity and temperature sensitive CPC supraballs were obtained via immobilization of polyacrylamide(PAM)and polyisopropylacrylamide(PNIPAM)hydrogels into the CPC structure,respectively,and CdTe/ZnS quantum dots endow the supraballs fluorescent signal under UV ***,Fe_(3)O_(4) nanoparticles(NPs)were served as a magnetic hemisphere to construct CPC Janus supraballs which can be subsequently assembled into three different molecular-shaped cluster particles that integrate more response types via Fe_(3)O_(4) NPs hemisphere coalescence to a magnetic coupling center,recognizing multiple responses simultaneously that correspond the environmental *** addition,2D polychromatic patterns with sensitive CPC pixels printed by automatic printing system were demonstrated,which could monitor the changes of temperature and *** multi-responsive magnetic controlling supraballs and 2D patterns reveal the promising applications in environmental sensing,anti-counterfeiting and displaying.

关键词： Photonic crystal Multiple responses optical sensing Supraballs Microfluidics Magnetic control

Investigation of the limit of lateral beam shifts on a symmetrical metal-cladding waveguide

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Chinese Physics B 2009年第11期18卷 4875-4880页

作者：陈麟朱亦鸣张大伟曹庄琪庄松林 Shanghai Key Lab of Modern optical System University of Shanghai for Science and Technology Guided Wave Photonics Group Shanghai Jiao Tong University

This paper reports that Goos-Hǎnchen （GH） shifts occurring on a symmetrical metal-cladding waveguide are experimentally identified. It was found that there exists a critical thickness of the upper metal layer, hcr, above which negative shift is observed and, reversely, positive shift occurs. Both positive and negative GH shifts near the critical thickness do not vary dramatically and can achieve a maximum on the submillimeter scale, which is different from simulated results using the stationary-phase method. It also shows that this critical thickness, hcr, can be obtained at the position for zero reflectivity by setting the intrinsic damping to be the same as the radiative damping. The GH effects observed near the critical thickness are produced by extreme distortion of the reflected beam profiles, which limits the amplitude of the GH shift and, further, the sensitivity of the GH optical sensor based on the symmetrical metal-cladding waveguide.

关键词： Goos-Hǎnchen shift symmetrical metal-cladding waveguide optical sensing

Highly-sensitive NO,NO2,and NH3 measurements with an open-multipass cell based on mid-infrared wavelength modulation spectroscopy

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Chinese Physics B 2018年第4期27卷 250-257页

作者： Xiang Chen Chen-Guang Yang Mai Hu Jian-Kang Shen Er-Chao Niu Zhen-Yu Xu Xue-Li Fan Min Wei Lu Yao Ya-Bai He Jian-Guo Liu Rui-Feng Kan Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 2300314 China University of Science and Technology of China Hefei 230022 China Jiangsu Environmental Monitoring Center Nanjing 210036 China

A compact prototype based on mid-infrared wavelength modulation spectroscopy（WMS）is developed for the simul-taneous monitoring of NO,NO2,and NH3 in the urban *** quantum cascade lasers（QCLs）with central frequencies around 1900.0 cm^-1,1600.0 cm^-1,and 1103.4 cm^-1are used for NO,NO2,and NH3detections,respectively,by timedivision *** open-path multi-pass cell of 60-m optical path length is applied to the instrument for high sensitivity and reducing the response time to less than 1 *** prototype achieves a sub-ppb detection limit for all the three target gases with an average time of about 100 *** instrument is installed in the Jiangsu environmental monitoring center to conduct performance tests on ambient *** 24-hour measurements show good agreement with the results of a reference instrument based on the chemiluminescence technique.

关键词： wavelength modulation spectroscopy optical sensing atmospheric monitoring time division multiplexing quantum cascade laser mid-infrared laser spectroscopy

Controlled Assembly of Luminescent Lanthanide‑Organic Frameworks via Post‑Treatment of 3D‑Printed Objects

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Nano-Micro Letters 2021年第1期13卷 303-316页

作者： Jiahui Huang Peiyi Wu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200433People’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low‑Dimension MaterialsDonghua UniversityShanghai 201620People’s Republic of China

Complex multiscale assemblies of metal-organic frameworks are essential in the construction of largescale optical platforms but often restricted by their bulk nature and conventional *** integration of nanomaterials and 3D printing technologies allows the fabrication of multiscale functional *** study reports a unique method of controlled 3D assembly purely relying on the post-printing treatment of printed *** immersing a 3D-printed patterned construct consisting of organic ligand in a solution of lanthanide ions,in situ growth of lanthanide metal-organic frameworks(LnMOFs)can rapidly occur,resulting in macroscopic assemblies and tunable fluorescence *** phenomenon,caused by coordination and chelation of lanthanide ions,also renders a sub-millimeter resolution and high shape *** a proof of concept,a type of 3D assembled LnMOFsbased optical sensing platform has demonstrated the feasibility in response to small molecules such as *** is anticipated that the facile printing and design approach developed in this work can be applied to fabricate bespoke multiscale architectures of functional materials with controlled assembly,bringing a realistic and economic prospect.

关键词： 3D printing Luminescent lanthanide-organic frameworks Macroscopic assembly In situ growth optical sensing

Novel Apodized Fiber Bragg GratingApplied for Medical Sensors:Performance Investigation

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Computer Modeling in Engineering & Sciences 2023年第4期135卷 301-323页

作者： Ramya Arumugam Ramamoorthy Kumar Samiappan Dhanalakshmi Khin Wee Lai Lei Jiao Xiang Wu Department of Electronics and Communication Engineering College of Engineering and TechnologySRM Institute of Science and TechnologyKattankulathurChengalpattu603203India Department of Biomedical Engineering Faculty of EngineeringUniversiti MalayaKuala Lumpur50603Malaysia General Hospital of Xuzhou Mining Group Xuzhou221000China School of Medical Information&Engineering Xuzhou Medical UniversityXuzhou221000China

Sensors play an important role in shaping and monitoring human *** of methods to use Fiber Bragg Grating(FBG)with enhanced sensitivity has attracted great interest in the field of medical *** this paper,a novel apodization function is proposed and performance evaluation and optimization of the same have been made.A comparison was conducted between various existing apodization functions and the proposed one based on optical characteristics and sensor *** results evince the implementation of the proposed apodization function for vital sign *** optical characteristics considered for evaluation are Peak Resonance Reflectivity level,Side Lobes Reflectivity level and FullWidth HalfMaximum(FWHM).The proposed novel apodization novel function has better FWHM,which is narrower than the FWHM of uniform *** characteristics like a quality parameter,detection accuracy and sensitivity also show *** proposed novel apodization function is demonstrated to have a better shift in wavelength in terms of temperature and pulse measurement than the existing *** sensitivity of the proposed apodized function is enhanced with a Poly-dimethylsiloxane coating of varying thickness,which is 6 times and 5.14 times greater than uniform Fiber Bragg grating and FBG with the proposed novel apodization function,respectively,enhancing its utilization in the field of medicine.

关键词： Fiber bragg grating apodization optical sensing temperature strain sensitivity

Automotive Lighting Systems Based on Luminance/Intensity Grids: A Proposal Based on Real-Time Monitoring and Control for Safer Driving

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Computers, Materials & Continua 2021年第3期66卷 2373-2383页

作者： Antonio Peña-García Huchang Liao Department of Civil Engineering&Research Group“Lighting Technology for Safety and Sustainability” University of GranadaGranada18071Spain Business School Sichuan UniversityChengdu610064China

The requirements for automotive lighting systems,especially the light patterns ensuring driver perception,are based on criteria related to the headlamps,rather than the light perceived by drivers and road ***,important factors such as pavement reflectance,driver age,or time of night,are largely *** factors such as presence of other vehicles,vehicle speed and weather conditions are considered by the Adaptive Driving Beam(ADB)and Adaptive Front-lighting System(AFS)respectively,though with no information regarding the visual perception of drivers and other road ***,it is simpler to simulate and measure the light emitted by the lamps than the light reflected by the pavement or emitted by other *** the current technology in cameras and light sensors,communication protocols,and control of Light Emitting Diodes(LED),combined with decision-making techniques applied to large amounts of data,can open a new era in the operation of headlamps and thus ensure the visual needs of drivers in real time and under actual road *** solution lies in an interaction road-sensor-headlamp,which is not based on the light emitted by headlamps,but rather on the light perceived by the *** study thus proposes a dual grid based on luminance and luminous intensity,which would manage the headlamps by optimizing driver perception and the safety of all road users.

关键词： Vehicle systems optical sensing LED control automotive lighting

Photonic gas sensors exploiting directly the optical properties of hybrid carbon nanotube localized surface plasmon structures

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Light(Science & Applications) 2016年第1期5卷 624-631页

作者： Thomas Allsop Raz Arif Ron Neal Kyriacos Kalli Vojtěch Kundrát Aleksey Rozhin Phil Culverhouse David J Webb Aston Institute of Photonic Technologies School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK Nanoscience Research Group School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK Physics Department Faculty of ScienceUniversity of SulaimaniSulaimaniIraq-Kurdistan Region Faculty of Science and Technology School of MathsComputing and RoboticsUniversity of PlymouthPlymouth PL48AAUK Department of Electrical Engineering Computer Engineering and InformaticsCyprus University of TechnologyLimassol 3036Cyprus

Weinvestigate the modification of the optical properties of carbon nanotubes(CNTs)resulting from a chemical reaction triggered by the presence of a specific compound(gaseous carbon dioxide(CO_(2)))and show this mechanism has important consequences for chemical *** have attracted significant research interest because they can be functionalized for a particular chemical,yielding a specific physical response which suggests many potential applications in the fields of nanotechnology and *** far,however,utilizing their optical properties for this purpose has proven to be *** demonstrate the use of localized surface plasmons generated on a nanostructured thin film,resembling a large array of nano-wires,to detect changes in the optical properties of the *** selectivity is demonstrated using CO_(2) in gaseous form at room *** demonstrated methodology results additionally in a new,electrically passive,optical sensing configuration that opens up the possibilities of using CNTs as sensors in hazardous/explosive environments.

关键词： carbon nanotubes gas sensors localized surface plasmons optical sensing