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Generating a nanoscale blade-like optical field in a coupled nanofiber pair

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Photonics Research 2024年第1期12卷 154-162页

作者： YUXIN YANG JIAXIN GAO HAO WU ZHANKE ZHOU LIU YANG XIN GUO PAN WANG limin tong Interdisciplinary Center for Quantum Information New Cornerstone Science LaboratoryState Key Laboratory of Extreme Photonics and InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

An optical field with sub-nm confinement is essential for exploring atomic-or molecular-level light-matter *** such fields demonstrated so far have typically point-like cross-sections,an optical field having a higher-dimensional cross-section may offer higher flexibility and/or efficiency in ***,we propose generating a nanoscale blade-like optical field in a coupled nanofiber pair(CNP)with a 1-nm-width central *** on a strong mode coupling-enabled slit waveguide mode,a sub-nm-thickness blade-like optical field can be generated with a cross-section down to~0.28 nm×38 nm at 1550 nm wavelength(i.e.,a thickness of~λ_(0)∕5000)and a peak-to-background intensity ratio(PBR)higher than 20 d *** slit waveguide mode of the CNP can be launched from one of the two nanofibers that are connected to a standard optical fiber via an adiabatical fiber taper,in which a fundamental waveguide mode of the fiber can be converted into a high-purity slit mode with high efficiency(>98%)within a CNP length of less than 10μm at 1550 nm *** wavelengthdependent behaviors and group velocity dispersion in mode converting processes are also investigated,showing that such a CNP-based design is also suitable for broadband and ultrafast pulsed *** results may open up new opportunities for studying light-matter interaction down to the sub-nm scale,as well as for exploring ultra-high-resolution optical technology ranging from super-resolution nanoscopy to chemical bond manipulation.

关键词： fiber waveguide optical

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Electric tuning of plasmonic resonances in ultrathin gold nanoribbon arrays

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Photonics Research 2024年第08期12卷 1750-1759页

作者： ZHENXIN WANG ALEXEY V.KRASAVIN CHENXINYU PAN JUNSHENG ZHENG ZHIYONG LI XIN GUO ANATOLY V.ZAYATS limin tong PAN WANG State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University Department of Physics and London Centre for Nanotechnology King's College London Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging Intelligent Optics & Photonics Research Center Jiaxing Research Institute Zhejiang University

Ultrathin plasmonic nanostructures offer an unparalleled opportunity for the study of light–matter interactions at the nanoscale and realization of compact nanophotonic devices. In this study, we introduce an ultrathin gold nanoribbon array and demonstrate an electric approach to actively tuning its plasmonic resonance, which leveraging the extreme light confinement capability in the ultrathin plasmonic nanostructure and a robust nanoscale electro-optical effect in indium tin oxide. Optimizing the design(to a total thickness as small as 12 nm for a 2-nmthick gold nanoribbon array), we numerically demonstrate a spectral shift in the plasmonic resonance up to 36 nm along with an approximately 16% change in the transmission at a gate voltage below 1.7 V at the wavelength of1.47 μm. This work presents progress towards electric tuning of plasmonic resonances in ultrathin metallic nanostructures for various applications including surface-enhanced spectroscopy, spontaneous emission enhancement,and optical modulation.

关键词： Chemical sensors Diffraction limit Electrooptical effects Indium tin oxide Light matter interactions Nanostructures

Optical micro/nanofiber enabled tactile sensors and soft actuators:A review

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Opto-Electronic Science 2024年第8期 17-34页

作者： Lei Zhang Yuqi Zhen limin tong State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University

As a combination of fiber optics and nanotechnology, optical micro/nanofiber(MNF) is considered as an important multifunctional building block for fabricating various miniaturized photonic devices. With the rapid progress in flexible optoelectronics, MNF has been emerging as a promising candidate for assembling tactile sensors and soft actuators owing to its unique optical and mechanical properties. This review discusses the advances in MNF enabled tactile sensors and soft actuators, specifically, focusing on the latest research results over the past 5 years and the applications in health monitoring, human-machine interfaces, and robotics. Future prospects and challenges in developing flexible MNF devices are also presented.

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Precise mode control of laser-written waveguides for broadband,low-dispersion 3D integrated optics

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Light(Science & Applications) 2024年第6期13卷 1186-1195页

作者： Yuying Wang Lijing Zhong Kuen Yao Lau Xuhu Han Yi Yang Jiacheng Hu Sergei Firstov Zhi Chen Zhijun Ma limin tong Kin Seng Chiang Dezhi Tan Jianrong Qiu College of Optical Science and Engineering Zhejiang University310027HangzhouChina Institute of Light+X Science and Technology College of Information Science and EngineeringNingbo University315211NingboChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University215006SuzhouChina Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center38 Vavilov str.Moscow119333Russia Zhejiang Lab 311121HangzhouChina College of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and Technology650093KunmingYunnanChina Department of Electrical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina School of Materials Science and Engineering Zhejiang University310027HangzhouChina

Three-dimensional(3D)glass chips are promising waveguide platforms for building hybrid 3D photonic circuits due to their 3D topological capabilities,large transparent windows,and low coupling *** present,the key challenge in scaling down a benchtop optical system to a glass chip is the lack of precise methods for controlling the mode field and optical coupling of 3D waveguide ***,we propose an overlap-controlled multi-scan(OCMS)method based on laser-direct lithography that allows customizing the refractive index profile of 3D waveguides with high spatial precision in a variety of *** the basis of this method,we achieve variable mode-field distribution,robust and broadband coupling,and thereby demonstrate dispersionless LP21-mode conversion of supercontinuum pulses with the largest deviation of<0.1 dB in coupling ratios on 210 nm *** approach provides a route to achieve ultra-broadband and low-dispersion coupling in 3D photonic circuits,with overwhelming advantages over conventional planar waveguide-optic platforms for on-chip transmission and manipulation of ultrashort laser pulses and broadband supercontinuum.

关键词： waveguide mode dispersion

Optical microfiber or nanofiber:a miniature fiber-optic platform for nanophotonics

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Photonics Insights 2024年第1期3卷 27-74页

作者： Jianbin Zhang Hubiao Fang Pan Wang Wei Fang Lei Zhang Xin Guo limin tong Interdisciplinary Center for Quantum Information New Cornerstone Science LaboratoryState Key Laboratory of Extreme Photonics and InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhouChina Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxingChina Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanChina

An optical micro/nanofiber(MNF)is a quasi-one-dimensional free-standing optical waveguide with a diameter close to or less than the vacuum wavelength of *** the tiny geometry with highrefractive-index contrast between the core and the surrounding,the MNF exhibits favorable optical properties such as tight optical confinement,strong evanescent field,and large-diameter-dependent waveguide ***,as a quasi-one-dimensional structure with extraordinarily high geometric and structural uniformity,the MNF also has low optical loss and high mechanical strength,making it favorable for manipulating light on the micro/nanoscale with high *** the past two decades,optical MNFs,typically being operated in single mode,have been emerging as a miniaturized fiber-optic platform for both scientific research and technological *** this paper,we aim to provide a comprehensive overview of the representative advances in optical MNFs in recent *** from the basic structures and fabrication techniques of the optical MNFs,we highlight linear and nonlinear optical and mechanical properties of the ***,we introduce typical applications of optical MNFs from nearfield optics,passive optical components,optical sensors,and optomechanics to fiber lasers and atom ***,we give a brief summary of the current status of MNF optics and technology,and provide an outlook into future challenges and opportunities.

关键词： micro/nanofibers fabrication optical properties mechanical properties optical applications

A bioinspired flexible optical sensor for force and orientation sensing

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Opto-Electronic Advances 2023年第5期6卷 4-6页

作者： Lei Zhang limin tong State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Research Center for Humanoid Sensing Zhejiang LabHangzhou 311121China

Flexible optical sensors have been an emerging paradigm for applications in robotics,healthcare,and human–machine interfaces due to their high sensitivity,fast response,and anti-electromagnetic ***,Marques reports a bioinspired multifunctional flexible optical sensor(BioMFOS),achieving a forces sensitivity of 13.28μN,and a spatial resolution of 0.02 *** BioMFOS has a small dimension(around 2 cm)and a light weight(0.8 g),making it suitable for wearable application and clothing *** proof-of-concept demonstrations,monitoring of finger position,trunk movements,and respiration rate are realized,implying their prominent applications in remote healthcare,intelligent robots,assistance devices teleoperation,and human-machine interfaces.

关键词： optical proof sensor

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Brief introduction to optical microfibers and nanofibers

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Frontiers of Optoelectronics 2010年第1期3卷 54-60页

作者： limin tong State Key Laboratory of Modern Optical Instrumentation Department of Optical EngineeringZhejiang University

When its diameter goes close to or below the wavelength of the guided light, an optical microfiber/nanofiber(MNF) exhibits favorable properties such as tight optical confinement, strong near-field interaction, and excellent mechanical strength, which offers plenty of choices for combining a variety of functionalized materials ranging from semiconductors and metals to laser dyes;opens up plenty of opportunities for developing microphotonic or nanophotonic devices; and inspires new opportunities for near-field optics, nonlinear optics, and quantum optics.

关键词： microfiber nanofiber optical property

Micro/Nanofiber Optical Sensors

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Photonic Sensors 2011年第1期1卷 31-42页

作者： Lei ZHANG Jingyi LOU limin tong State Key Lab of Modern Optical Instrumentation Zhejiang UniversityHangzhou 310027China Zhejiang University of Science and Technology Hangzhou 310023China

As a low-dimensional optical fiber with diameter close to or below the wavelength of light,optical micro/nanofiber(MNF)offers a number of favorable properties for optical sensing,which have been exploited in a variety of sensing applications,including physical,chemical,and biological *** this paper we review the principles and applications of silica,glass,and polymer optical micro/nanofibers for physical and chemical sensing.

关键词： Optical microfiber optical nanofiber tapered fiber physical sensor chemical sensor review

Functionalized polymer nanofibers: a versatile platform for manipulating light at the nanoscale

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Light(Science & Applications) 2013年第1期2卷 48-57页

作者： Pan Wang Yipei Wang limin tong State Key Laboratory of Modern Optical Instrumentation Department of Optical EngineeringZhejiang UniversityHangzhou 310027China

As an organic optical fiber with a diameter comparable to or less than the wavelength of light,polymer nanofibers have been attracting increasing attention as a platform for manipulating light at the nanoscale.A variety of applications for polymer optical nanofibers,including waveguides,light sources and sensors,have been reported in recent *** this article,the recent progress in the field of polymer optical nanofibers is reviewed in terms of their fabrication,characterization and *** particular,we focus on functionalized polymer nanofibers doped with functional materials,such as dye molecules,noble metal nanoparticles,quantum dots and rare earth ions,which greatly expand their capabilities of generating,propagating,converting and modulating light at the nanoscale.

关键词： functionalization polymer nanofibers waveguides