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Optical responses of metallic plasmonic arrays under the localized excitation

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Nano Research 2024年第3期17卷 1571-1577页

作者： Sen Yan Hao Ma Yi-Fan Bao Maofeng Cao Chuan Liu Kaifeng Zhang Xiaowei Wu Jianbo He Xiang Wang Bin Ren State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Research&Development group HitachiLtd.Yokohama 244-0817KanagawaJapan Department of Electronic Science and Engineering Kyoto UniversityKyoto 615-8510Japan

The metallic plasmonic array that can support both propagating surface plasmon polaritons(PSPPs)and localized surface plasmon resonance(LSPR)possesses rich optical properties and remarkable optical performance,making it a powerful platform for applications in photonics,chemistry,and *** practical applications,the excitation spot is usually smaller than the area of metal *** is thus imperative to address“how many array units are enough?”towards a rational design of plasmonic ***,we employed focused ion beam(FIB)to precisely fabricate a series of plasmonic array structures with increased unit *** utilizing photoluminescence(PL)and surface-enhanced Raman spectroscopy(SERS),we found that the array units outside the excitation spot still have a significant impact on the optical response within the *** with the numerical simulation,we found that the boundary of the finite array leads to the loss of PSPP outside the excitation point,which subsequently affects the coupling of PSPP and LSPR in the excitation spot,leading to variations in PL and SERS *** on the findings,we further tuned the LSPR mode of the metal arrays by electrodeposition to obtain strong near-field enhancement without any influence on the PSPP *** work advances the understanding of near-field and far-field optical behavior in finite-size array structures and provides guidance for designing highly-efficient photonic devices.

关键词： plasmonic periodic array finite-size effects dark field scattering surface-enhanced Raman spectroscopy(SERS)

Deep-learning-based methods for super-resolution fluorescence microscopy

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Journal of Innovative Optical Health Sciences 2023年第3期16卷 85-100页

作者： Jianhui Liao Junle Qu Yongqi Hao Jia Li Shenzhen Key Laboratory of photonics and Biophotonics Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060P.R.China NARI group Corporation(State Grid Electric Power Research Institute)NARI Technology Co. Ltd.Nanjing 211106P.R.China

The algorithm used for reconstruction or resolution enhancement is one of the factors affectingthe quality of super-resolution images obtained by fluorescence ***-learning-basedalgorithms have achieved stateof-the-art performance in super-resolution fluorescence micros-copy and are becoming increasingly *** firstly introduce commonly-used deep learningmodels,and then review the latest applications in terms of the net work architectures,the trainingdata and the loss ***,we discuss the challenges and limits when using deeplearning to analyze the fluorescence microscopic data,and suggest ways to improve the reliability and robustness of deep learning applications.

关键词： Super-resolution fuorescence microscopy deep learning convolutional neural net-work generative adversarial network image reconstruction

New control algorithm for automatic PMD compensation system

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Chinese Optics Letters 2012年第3期10卷 27-30页

作者：张锦南谷月袁学光田凤张晓光陶金晶 Institute of Information photonics and Optical Communications Beijing University of Posts and Telecommunications State Key Laboratory of Information photonics and Optical Communications Beijing University of Posts and Telecommunications Network Operation Supporting Center China Mobile Group Beijing Co.Ltd.

A new cross-tracking method is proposed to improve the convergent speed of the control algorithm in real-time polarization mode dispersion（PMD）compensation *** cross-tracking algorithm is compared with the previously used dithering particle swarm optimization（DPSO）and gradient particle swarm optimization（GPSO）algorithms,and it is proven to offer the best performance among the three *** transmission of a 43-Gb/s differential quadrature phase-shift keying（DQPSK）signal over a 1 200-km fiber span using a compensator based on digital signal processing（DSP）is demonstrated via the cross-tracking algorithm.

关键词： Algorithms Quadrature phase shift keying Signal processing Tracking (position)

Phonon imaging in 3D with a fibre probe

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Light(Science & Applications) 2021年第6期10卷 1007-1019页

作者： Salvatore La Cavera III Fernando Perez-Cota Richard JSmith Matt Clark Optics and photonics group Faculty of EngineeringUniversity of NottinghamUniversity ParkNottingham NG72RDUK

We show for the first time that a single ultrasonic imaging fibre is capable of simultaneously accessing 3D spatial information and mechanical properties from microscopic *** novel measurement system consists of two ultrafast lasers that excite and detect high-frequency ultrasound from a nano-transducer that was fabricated onto the tip of a single-mode optical fibre.A signal processing technique was also developed to extract nanometric in-depth spatial measurements from GHz frequency acoustic waves,while still allowing Brillouin spectroscopy in the frequency ***-free and non-contact imaging performance was demonstrated on various polymer *** singular device is equipped with optical lateral resolution,2.5μm,and a depth-profiling precision of 45 nm provided by *** endoscopic potential for this device is exhibited by extrapolating the single fibre to tens of thousands of fibres in an imaging *** a device catalyses future phonon endomicroscopy technology that brings the prospect of label-free in vivo histology within reach.

关键词： fibre equipped acoustics

Mode-locked fiber laser of 3.5 μm using a single-walled carbon nanotube saturable absorber mirror

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Chinese Optics Letters 2022年第1期20卷 79-84页

作者：韦金成李鹏於林鹏阮双琛李可意闫培光王佳晨王金章郭春雨刘文军华萍吕启涛 Shenzhen Key Laboratory of Laser Engineering Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education InstitutesGuangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China State Key Laboratory of Information photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Faculty of Engineering and Physical Sciences University of SouthamptonSouthampton SO 171BJUK Han’s Laser Technology Industry group Co. Ltd.Shenzhen 518057China

We report on a mid-infrared fiber laser that uses a single-walled carbon nanotube saturable absorber mirror to realize the mode-locking *** laser generates 3.5 μm ultra-short pulses from an erbium-doped fluoride fiber by utilizing a dual-wavelength pumping *** mode-locking is achieved at the 3.5 μm band with a repetition rate of 25.2 *** maximum average power acquired from the laser in the mode-locking regime is 25 *** experimental results indicate that the carbon nanotube is an effective saturable absorber for mode-locking in the mid-infrared spectral region.

关键词： mid-infrared laser fluoride fiber laser mode-locked laser saturable absorber

Four-state reference-frame-independent quantum key distribution using heralded pair-coherent sources with source flaws

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Optoelectronics Letters 2021年第10期17卷 636-640页

作者：冯宝赵子岩杨舜禹窦天琦李振华王吉鹏孙钟齐周芬韩雁鑫黄雨晴马海强 NARI group Corporation (State Grid Electric Power Research Institute)Nanjing 211106China NRGD Quantum Technology Co. Ltd.Nanjing 211106China School of Science and State Key Laboratory of Information photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

We propose a four-state reference-frame-independent quantum key distribution(RFI-QKD)protocol with the heralded pair-coherent source(HPCS).We investigate the performance of the proposed protocol and simulation results show that our protocol can achieve a high key generation rate in long-distance transmission,taking source flaws and statistical fluctuations into *** fewer states are used,this protocol not only has a higher key generation rate at the same transmission distance but also a longer transmission distance with the same secure communication compared with the original six-state RFI-QKD protocol using the weak coherent source(WCS).

关键词： coherent source state

Sub-50 fs pulses at 2050 nm from a picosecond Ho:YLF laser using a two-stage Kagome-fiber-based compressor

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photonics Research 2022年第3期10卷 637-645页

作者： Krishna Murari Giovanni Cirmi Hüseyin Cankaya Gregory J.Stein Benoit Debord Frederic Gerome Felix Ritzkosky Fetah Benabid Oliver Muecke Franz X.Kärtner Center for Free Electron Laser Science CFEL Deutsches Elektronen-Synchrotron DESY22607 HamburgGermany Max-Planck Institute for Structure and Dynamics of Matter(MPSD) 22761 HamburgGermany ELI-ALPS ELI-HU Non-Profit Ltd.Szeged H-6728Hungary The Hamburg Center for Ultrafast Imaging&Department of Physics University of Hamburg22761 HamburgGermany GPPMM group XLIM Research InstituteUMR 7252 CNRSUniversity of LimogesLimogesFrance show less

The high-energy few-cycle mid-infrared laser pulse beyond 2μm is of immense importance for attosecond science and strong-field ***,the limited gain bandwidth of laser crystals such as Ho:YLF and Ho:YAG allows the generation of picosecond(ps)long pulses and,hence,makes it challenging to generate few-cycle pulse at 2μm without utilizing an optical parametric chirped-pulse amplifier(OPCPA).Moreover,the exclusive use of the near-infrared wavelength has limited the generation of wavelengths beyond 4μm(OPCPA).Furthermore,high harmonic generation(HHG)conversion efficiency reduces dramatically when driven by a long-wavelength *** schemes such as multi-color HHG have been proposed to enhance the harmonic ***,it is highly desirable to generate few-cycle to femtosecond pulses from a 2μm laser for driving these ***,we utilize two-stage nonlinear spectral broadening and pulse compression based on the Kagome-type hollow-core photonic crystal fiber(HC-PCF)to compress few-ps pulses to sub-50 fs from a Ho:YLF amplifier at 2μm at 1 kHz repetition *** demonstrate both experimentally and numerically the compression of 3.3 ps at 140μJ pulses to 48 fs at 11μJ with focal intensity reaching 10^(13)W/cm^(***,this system can be used for driving HHG in solids at 2μ*** the first stage,the pulses are spectrally broadened in Kagome fiber and compressed in a silicon-based prism compressor to 285 fs at a pulse energy of 90μ*** the second stage,the 285 fs pulse is self-compressed in air-filled *** fine-tuning of the group delay dispersion(GDD)externally in a 3 mm window,a compressed pulse of 48 fs is *** leads to a 70-fold compression of the ps pulses at 2050 *** further used the sub-50 fs laser pulses to generate white light by focusing the pulse into a thin medium of YAG.

关键词： fiber amplifier compressor

Generation of single solitons tunable from 3 to3.8μm in cascaded Er^(3+)-doped and Dy^(3+)-doped fluoride fiber amplifiers

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photonics Research 2022年第9期10卷 2140-2146页

作者： LINPENG YU JINHUI LIANG SHITING HUANG JINZHANG WANG JIACHEN WANG XING LUO PEIGUANG YAN FANLONG DONG XING LIU QITAO LUE CHUNYU GUO SHUANGCHEN RUAN Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology UniversityShenzhen 518118China Han’s Laser Technology Industry group Co. Ltd.Shenzhen 518057China

High-power tunable femtosecond mid-infrared(MIR)pulses are of great interest for many scientific and industrial *** we demonstrate a compact fluoride-fiber-based system that generates single solitons tunable from 3 to 3.8μ*** system is composed of an Er:ZBLAN fiber oscillator and amplifier followed by a fusion-spliced Dy:ZBLAN fiber *** Er:ZBLAN fiber amplifier acts as a power booster as well as a frequency shifter to generate Raman solitons up to 3μ*** Dy:ZBLAN fiber amplifier transfers the energy from the residual 2.8μm radiation into the Raman solitons using an in-band pumping scheme,and further extends the wavelength up to 3.8μ*** residual pump radiation and secondary solitons accompanying the soliton self-frequency shift(SSFS)are recycled to amplify Raman solitons,consequently displaying a higher output power and pulse energy,a wider shifting range,and an excellent spectral *** 252 fs pulses at3.8μm with a record average power of 1.6 W and a pulse energy of 23 n J are *** work provides an effective way to develop high-power widely tunable ultrafast single-soliton MIR laser sources,and this method can facilitate the design of other SSFS-based laser systems for single-soliton generation.

关键词： fiber tunable amplifier

Carrier localization in InGaN by composition fluctuations: implication to the “green gap”

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photonics Research 2017年第2期5卷 7-12页

作者： SERGEY YU.KARPOV STR group-Soft-Impact Ltd.

A simple semi-empirical model for radiative and Auger recombination constants is suggested,accounting for hole localization by composition fluctuations in InGaN *** of fluctuation with the indium molar fraction in InGaN is found to be largely responsible for decreases in both the radiative and Auger recombination constants with emission *** model provides good fitting of the experimental spectral dependencies of the recombination constants,thus demonstrating implication of the carrier localization to light-emitting diode efficiency reduction in the"green gap."

关键词： InGaN implication to the Carrier localization in InGaN by composition fluctuations green gap