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Chinese optics Letters 2007年第12期5卷 709-711页

作者： Weibin Chen Qiwen Zhan electro-optics Graduate program University of Dayton 300 College Park Dayton Ohio 45469-0245 USA

Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM

关键词： Field enhancement Finite element method Metrology Near field scanning optical microscopy Polarization Rayleigh scattering

Improving the sensitivity of fiber-optic SPR sensor via radially polarized beam excitation

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Chinese optics Letters 2009年第10期7卷 909-911页

作者：阎杰鲁拥华王沛顾春郑荣升陈勇明海詹其文 Department of Physics University of Science and Technology of ChinaAnhui Key Laboratory of Optoelectronic Science and Technology electro-optics Graduate program University of Dayton

We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance （SPR） sensor using radially polarized beam （RPB）. Because of the rotational symmetry of fiber and RPB, surface plasmon can be excited more efficiently at the sensor surface, which results in an obvious improvement of the sensitivity. Our experiments demonstrate that the sensitivity in the case of RPB illumination is three times higher than that of linearlv polarized beam illumination.

关键词： Fiber optics Plasmons Sensors

Self-collimation in photonic crystals with anisotropic constituents

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Chinese optics Letters 2007年第9期5卷 527-530页

作者： J.W.Haus M.Siraj P.Prasad P.Markowicz electro-optics program University of DaytonDaytonOH 45469-0245 State University of New York at Buffalo Institute for LasersPhotonics and BiophotonicsBuffaloNY 14260-3000

In a photonic crystal composed of anisotropic constituents we quantify the range of input angles and the degree of collimation of the beam inside the crystal. The optical properties of a photobleached 4- dimethylamino-N-methyl-4-stilbazolium-tosylate （DAST） crystal are used in our model to demonstrate the efficacy of the self-collimation features.

关键词： Self-collimation in photonic crystals with anisotropic constituents

Creation of radially polarized optical fields with multiple controllable parameters using a vectorial optical field generator

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Photonics Research 2016年第5期4卷 35-39页

作者： Sichao Zhou Shiyi Wang Jian Chen Guanghao Rui Qiwen Zhan electro-optics Graduate program University of Dayton Globalfoundries School of electronic Engineering University of Electronic Science and Technology of China Advanced Photonics Center Southeast University

A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the VOF-Gen in terms of manipulating the spatial distributions of phase, amplitude, and polarization are experimentally demonstrated by generating a radially polarized optical field consisted of five annular rings, the focusing properties of which are also numerically studied with vectorial diffraction theory. By carefully adjusting the relative amplitude and phase between the adjacent rings, an optical needle field with purely longitudinal polarization can be produced in the focal region of a high numerical aperture lens. The versatile method presented in this work can be easily extended to the generation of a vectorial optical field with any desired complex distributions.

关键词： Creation of radially polarized optical fields with multiple controllable parameters using a vectorial optical field generator SLM

Active modulation of plasmonic signal with a subwavelength metal/nonlinear dielectric material/metal structure

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Chinese optics Letters 2010年第6期8卷 584-587页

作者：王小蕾王沛陈春翀陈俊学鲁拥华明海詹其文 Department of Physics Anhui Key Laboratory of Optoelectronic Science and TechnologyUniversity of Science and Technology of China electro-optics Graduate program University of Dayton300 College ParkDaytonOH 45469USA

Light propagation through a metal/nonlinear dielectric material/metal（M-NL-M） structure is numerically *** design parameters of the M-NL-M structure are found with the waveguide theory so that the structure only supports the symmetric surface plasmon polaritons（SPP（0）） mode and the antisymmetric surface plasmon polaritons（SPP（1）） *** coupling between the two modes within the M-NL-M structure is *** controlling the propagation constants of the two modes with the intensity-dependent dielectric constant of the nonlinear Kerr material,an effective all-optical control of plasmonic signal modulator can be realized with this M-NL-M structure.

关键词： Modulation Phonons Photons Quantum theory Solids

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optics-driven drone

Science China(Information Sciences) 2024年第2期67卷 322-324页

作者： Xuelong LI Guan HUANG Zhigang WANG Bin ZHAO School of Artificial Intelligence OPtics and Electro Nics (iOPEN)Northwestern Polytechnical University Shanghai Artificial Intelligence Laboratory

In the field of vicinagearth security, low-altitude flying vehicles such as drones play an indispensable role in aerial remote sensing, intelligent search and rescue, etc. [1]. It can be foreseen that the autonomous and intelligent execution of complex tasks by drones is an inevitable trend for future development.

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Polyethylene glycol fusion repair of severed rat sciatic nerves reestablishes axonal continuity and reorganizes sensory terminal fields in the spinal cord

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Neural Regeneration Research 2025年第7期20卷 2095-2107页

作者： Emily A.Hibbard Liwen Zhou Cathy Z.Yang Karthik Venkudusamy Yessenia Montoya Alexa Olivarez George D.Bittner Dale R.Sengelaub program in Neuroscience Indiana UniversityBloomingtonINUSA Department of Neuroscience University of Texas at AustinAustinTXUSA

Peripheral nerve injuries result in the rapid degeneration of distal nerve segments and immediate loss of motor and sensory functions;behavioral recovery is typically *** used a plasmalemmal fusogen,polyethylene glycol(PEG),to immediately fuse closely apposed open ends of severed proximal and distal axons in rat sciatic *** have previously reported that sciatic nerve axons repaired by PEG-fusion do not undergo Wallerian degeneration,and PEG-fused animals exhibit rapid(within 2–6 weeks)and extensive locomotor ***,our previous report showed that PEG-fusion of severed sciatic motor axons was non-specific,i.e.,spinal motoneurons in PEG-fused animals were found to project to appropriate as well as inappropriate target *** this study,we examined the consequences of PEG-fusion for sensory axons of the sciatic *** adult male and female rats(Sprague–Dawley)received either a unilateral single cut or ablation injury to the sciatic nerve and subsequent repair with or without(Negative Control)the application of *** action potentials recorded immediately after PEG-fusion repair confirmed conduction across the injury *** success of PEG-fusion was confirmed through Sciatic Functional Index testing with PEG-fused animals showing improvement in locomotor function beginning at 35 days *** 2–42 days postoperatively,we anterogradely labeled sensory afferents from the dorsal aspect of the hindpaw following bilateral intradermal injection of wheat germ agglutinin conjugated horseradish ***-fusion repair reestablished axonal *** to unoperated animals,labeled sensory afferents ipsilateral to the injury in PEG-fused animals were found in the appropriate area of the dorsal horn,as well as inappropriate mediolateral and rostrocaudal ***,despite having intact peripheral nerves,similar reorganizations of labeled sensory afferents were also observed contralateral to the injury and repa

关键词： axotomy dorsal horn peripheral nerve injury plasticity polyethylene glycol(PEG) sciatic nerve sensory terminals wheat germ agglutinin horseradish peroxidase

Self-starting passively mode-locked all fiber laser based on carbon nanotubes with radially polarized emission

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Photonics Research 2016年第6期4卷 327-330页

作者： Yong Zhou Jian Lin Xiaoqiang Zhang Lixin Xu Chun Gu Biao Sun Anting Wang Qiwen Zhan Department of optics and Optical Engineering University of Science and Technology of China electro-optics program University of Dayton

We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fiber with four-mode fiber is utilized as a mode coupler in the laser cavity. Carbon nanotubes are introduced into the laser cavity as the saturable absorber to achieve self-start mode locking. The laser operates at 1547.5 nm with a narrow spectrum width of 0.3 nm at 30 d B. The emitted mode-locked pulses have a duration of 22.73 ps and repetition of10.61 MHz. A radially polarized beam has been obtained with high mode purity by adjusting the polarization in the laser cavity.

关键词： mode

Treatment of spinal cord injury with biomaterials and stem cell therapy in non-human primates and humans

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Neural Regeneration Research 2025年第2期20卷 343-353页

作者： Ana Milena Silva Olaya Fernanda Martins Almeida Ana Maria Blanco Martinez Suelen Adriani Marques PhD program in Pathological Anatomy Federal University of Rio de JaneiroRio de JaneiroBrazil Biomedical Science Institute Federal University of Rio de JaneiroRio de JaneiroBrazil Graduate program in Pathological Anatomy Federal University of Rio de JaneiroRio de JaneiroBrazil Graduate program in Pathological Anatomy(PPGAP/UFRJ) Department of Neurobiology/Institute of BiologyCampus do GragoatáNiteróiRio de JaneiroBrazil

Spinal cord injury results in the loss of sensory,motor,and autonomic functions,which almost always produces permanent physical ***,in the search for more effective treatments than those already applied for years,which are not entirely efficient,researches have been able to demonstrate the potential of biological strategies using biomaterials to tissue manufacturing through bioengineering and stem cell therapy as a neuroregenerative approach,seeking to promote neuronal recovery after spinal cord *** of these strategies has been developed and meticulously evaluated in several animal models with the aim of analyzing the potential of interventions for neuronal repair and,consequently,boosting functional *** the majority of experimental research has been conducted in rodents,there is increasing recognition of the importance,and need,of evaluating the safety and efficacy of these interventions in non-human primates before moving to clinical trials involving therapies potentially promising in *** article is a literature review from databases(PubMed,Science Direct,Elsevier,Scielo,Redalyc,Cochrane,and NCBI)from 10 years ago to date,using keywords(spinal cord injury,cell therapy,non-human primates,humans,and bioengineering in spinal cord injury).From 110 retrieved articles,after two selection rounds based on inclusion and exclusion criteria,21 articles were ***,this review arises from the need to recognize the experimental therapeutic advances applied in non-human primates and even humans,aimed at deepening these strategies and identifying the advantages and influence of the results on extrapolation for clinical applicability in humans.

关键词： bioengineering biomaterials cell therapy humans non-human primates spinal cord injury stem cell therapy

Controllable Fabrication of GeSi Nanowires in Diameter of About 10 nm Using the Top-Down Approach

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Chinese Physics Letters 2017年第11期34卷 102-105页

作者：曾成李毅夏金松 Huazhong Institute of electro-optics Wuhan 430074 Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074

Ordered GeSi nanowires with a ～ 10nm cross section are fabricated utilizing top-down and Ge condensation techniques. In transmission electron microscopy measurements, the obtained GeSi nanowires exhibit a single-crystal structure and a smooth Ge/SiO2 interface. Due to the linear relationship between the cross-section area and the initial pattern size under the self-limited oxidation condition, the cross-section size of GeSi nanowires can be precisely controlled. The Raman spectra reveal a high Ge fraction （up to 97%） and a biaxial strain of the GeSi nanowires. This top-down technique is promising for fabrication of high-performance GeSi nanowire based optoelectronic devices.

关键词： Controllable Fabrication of GeSi Nanowires in Diameter of About 10 nm Using the Top-Down Approach