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Long Period Grating Imprinted on a Flat-Shaped Plastic Optical Fiber for refractive index sensing

Photonic Sensors 2023年第4期13卷 39-49页

作者： Yuan LIU Yanfei ZHOU Haiyang BAO Jie ZHENG State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130012China

A corrugated surface long period grating(LPG)was fabricated on a flat-shaped plastic optical fiber(POF)as a refractive index(RI)sensor by a simple pressing with the heat pressure and mechanical die press print method.The light propagation characteristics of an LPG imprinted on a multi-mode POF were analyzed by the method of geometrical optics.Theoretical and experimental results showed that the structural parameters of the sensor affected the RI sensing performance,and the sensor with a thinner flat thickness,a deeper groove depth of the corrugated surface LPG,and a longer LPG exhibited better RI sensing performance.When the POF with a diameter of 1 mm was pressed with the heat pressure to a flat shape with a thickness of 600μm,an LPG with a period of 300μm,a groove depth of 200μm,and a length of 6 cm was fabricated on it,and the RI sensitivity of 1447%/RIU was obtained with a resolution of 5.494×10^(−6) RIU.In addition,the influences of the POF cladding,tilting of LPG,and bending of the sensing structure were investigated.The results demonstrated that after removing the cladding and tilting or bending the LPG,the RI sensing performance was improved.When the LPG imprinted on the flat-shaped POF was bent with a curvature radius of 6/πcm,the highest sensitivity of 6563%/RIU was achieved with a resolution of 2.487×10^(−9) RIU in the RI range of 1.3330–1.4230.The proposed sensor is a low-cost solution for RI measurement with the features of easy fabrication,high sensitivity,and intensity modulation at the visible wavelengths.

关键词： Plastic optical fiber fiber optic sensor flat-shaped optical fiber long period grating refractive index sensing

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Modeling of refractive index sensing Using Au Aperture Arrays on a Bragg Fiber Facet

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Photonic Sensors 2019年第4期9卷 337-343页

作者： Gongli XIAO Hongyan YANG Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin 541004China School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuilin 541004China

A finite-difference-time-domain(FDTD)approach is undertaken to investigate the extraordinary optical transmission(EOT)phenomenon of Au circular aperture arrays deposited on a Bragg fiber facet for refractive index(RI)sensing.Investigation shows that the choice of effective indices and modal loss of the Bragg fiber core modes will affect the sensitivity enhancement by using a mode analysis approach.The critical parameters of Bragg fiber including the middle dielectric RI,as well as its gap between dielectric layers,which affect the EOT and RI sensitivity for the sensor,are discussed and optimized.It is demonstrated that a better sensitivity of 156±5 nm per refractive index unit(RIU)and an averaged figure of merit exceeding 3.5 RIU‒1 are achieved when RI is 1.5 and gap is 0.02μm in this structure.

关键词： Optical fiber sensors surface plasmon resonance periodic array refractive index sensing finite-difference time-domain

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A refractive index Sensor Based on Four-Wave Mixing in D-Shaped Tellurite Photonic Crystal Fiber

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Photonic Sensors 2023年第3期13卷 90-98页

作者： Yuanhongliu GAO Xin YAN Xiaoyu CHEN Bin LI Tonglei CHENGCollege of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819China

In this study,we design a refractive index(RI)sensor using a novel cadmium telluride photonic crystal fiber(TPCF).Based on four-wave mixing(FWM),the changes in RI can be accurately detected,and RI sensing in the mid-infrared region(MIR)can be achieved by detecting wavelength shifts in the Stokes and anti-Stokes spectra caused by the changes in RI of the liquid to be measured.When the pump wavelength of FWM lies in the normal and abnormal dispersion regions of the TPCF,the RI response of the idler frequency wave and the signal wave are analyzed by numerical simulation methods.The simulation results show that the RI sensitivity of the sensor can be as high as 7692 nm/RIU with a linearity is up to 99.9%at the pump wavelength of 3380 nm.To our knowledge,the RI sensing sensitivity of the MIR is presented for the first time in this study by using FWM in the non-silicon PCF.

关键词： refractive index sensing tellurite photonic crystal fiber parametric gain,four wave mixing mid-infrared region

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A high Q terahertz asymmetrically coupled resonator and its sensing performance

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Frontiers of Optoelectronics 2015年第1期8卷 68-72页

作者： Dongwei WU Jianjun LIU Hao HAN Zhanghua HAN Zhi HONG Centre for THz Research China Jiliang University Hangzhou 310018 China

A terahertz asymmetrically coupled resonator （ACR） consisting of two different split ring resonators （SRRs） was designed. Using finite difference time domain （FDTD）, the transmission of ACR and its refractive-index- based sensing performaance were simulated and analyzed. Results show that the ACR possesses a sharp coupled transparent peak or high quality factor （Q）, its intensity and bandwidth can be easily adjusted by spacing the two SRRs. Furthermore, the resonator exhibits high sensitivity of 75 GHz/RIU and figure of merit （FOM） of 4.4, much higher than the individual SRR sensors. The ACR were fabricated by using laser-induced and chemical non-electrolytic plating with copper on polyimide substrate, the transmission of which measured by terahertz time-domain spectroscopy system is in good agreement with simulations.

关键词： terahertz asymmetrically coupled resonator（ACR） refractive index sensing high quality factor （Q）

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Holographically fabricated, highly reflective nanoporous polymeric distributed Bragg reflectors with red, green,and blue colors [Invited]

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Chinese Optics Letters 2020年第8期18卷 34-39页

作者：蒋皓东蔡文锋李珂成茗 Vineet Kumar 殷震 Davy Gerard 罗丹穆全全刘言军 Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Harbin Institute of Technology Harbin 150001China Light NanomaterialsNanotechnologies(L2n)Universitede Technologie de Troyes&CNRS ERL 7004Troyes 10004France State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China

We report holographic fabrication of nanoporous distributed Bragg reflector(DBR) films with periodic nanoscale porosity via a single-prism conuration. The nanoporous DBR films result from the phase separation in a material recipe, which consists of a polymerizable acrylate monomer and nonreactive volatile solvent. By changing the interfering angle of two laser beams, we achieve the nanoporous DBR films with highly reflective red,green, and blue colors. The reflection band of the nanoporous DBR films can be tuned by further filling different liquids into the pores inside the films, resulting in the color change accordingly. Experimental results show that such kinds of nanoporous DBR films could be potentially useful for many applications, such as color filters and refractive index sensors.

关键词： distributed Bragg reflector nanoporous reflection grating holographic fabrication phase separation refractive index sensing

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