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| 1 | Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis显示文摘Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning.However,a precise and repeatable location of a specific pulsation regime is extremely challenging.Here,by using fast spectral analysis based on a time-stretched dispersion Fourier transform as the spectral discrimination criterion,along with an intelligent polarization search algorithm,for the first time,we achieved real-time control of the spectral width and shape of mode-locked femtosecond pulses;the spectral width can be tuned from 10 to 40 nm with a resolution of ~1.47 nm,and the spectral shape can be programmed to be hyperbolic secant or triangular.Furthermore,we reveal the complex,repeatable transition dynamics of the spectrum broadening of femtosecond pulses,including five middle phases,which provides deep insight into ultrashort pulse formation that cannot be observed with traditional mode-locked lasers. | Guoqing Pu Lilin Yi Li Zhang Chao Luo Zhaohui Li Weisheng Hu | 2020 | Light(Science & Applications)2020，9，1： | 16 |
| 2 | A hybrid model for numerical wave forecasting and its implementation-Ⅰ.The wind wave model显示文摘The authors make an endeavor to explain why a new hybrid wave model is here proposed when several such models have already been in operation and the so- called third generation wave modej is proving attractive. This part of the paper is devoted to the wind wave model. Both deep and shallow water models have been developed, the former being actually a special case of the latter when water depth is great. The deep water model is exceptionally simple in form. Significant wave height is the only prognostic variable. In comparison with the usual methods to compute the energy input and dissipations empirically or by 'tuning', the proposed model has the merit that the effects of all source terms are combined into one term which is computed through empirical growth relations for significant waves, these relations being, relatively speaking, easier and more reliable to obtain than those for the source terms in the spectral energy balance equation. The discrete part of the model and the implementation of the | Wen Shengchang (S.C. Wen)1, Zhang Dacuo, Chen Bohai and Guo Peifang Institute of Physical Oceanography, Ocean University of Qingdao (Formerly, Shandong College of Oceanography), Qingdao, China | 1989 | Acta Oceanologica Sinica1989，8，1： | 14 |
| 3 | Spectral tomographic imaging with aplanatic metalens显示文摘Tomography is an informative imaging modality that is usually implemented by mechanical scanning,owing to the limited depth-of-field(DOF)in conventional systems.However,recent imaging systems are working towards more compact and stable architectures;therefore,developing nonmotion tomography is highly desirable.Here,we propose a metalens-based spectral imaging system with an aplanatic GaN metalens(NA=0.78),in which large chromatic dispersion is used to access spectral focus tuning and optical zooming in the visible spectrum.After the function of wavelength-switched tomography was confirmed on cascaded samples,this aplanatic metalens is utilized to image microscopic frog egg cells and shows excellent tomographic images with distinct DOF features of the cell membrane and nucleus.Our approach makes good use of the large diffractive dispersion of the metalens and develops a new imaging technique that advances recent informative optical devices. | Chen Chen Wange Song Jia-Wern Chen Jung-Hsi Wang Yu Han Chen Beibei Xu Mu-Ku Chen Hanmeng Li Bin Fang Ji Chen Hsin Yu Kuo Shuming Wang Din Ping Tsai Shining Zhu Tao Li | 2019 | Light(Science & Applications)2019，8，1： | 12 |
| 4 | Self-adaptive PID controller of microwave drying rotary device tuning on-line by genetic algorithms显示文摘The control design, based on self-adaptive PID with genetic algorithms(GA) tuning on-line was investigated, for the temperature control of industrial microwave drying rotary device with the multi-layer(IMDRDWM) and with multivariable nonlinear interaction of microwave and materials. The conventional PID control strategy incorporated with optimization GA was put forward to maintain the optimum drying temperature in order to keep the moisture content below 1%, whose adaptation ability included the cost function of optimization GA according to the output change. Simulations on five different industrial process models and practical temperature process control system for selenium-enriched slag drying intensively by using IMDRDWM were carried out systematically, indicating the reliability and effectiveness of control design. The parameters of proposed control design are all on-line implemented without iterative predictive calculations, and the closed-loop system stability is guaranteed, which makes the developed scheme simpler in its synthesis and application, providing the practical guidelines for the control implementation and the parameter design. | 杨彪 梁贵安 彭金辉 郭胜惠 李玮 张世敏 李英伟 白松 | 2013 | Journal of Central South University2013，20，10： | 6 |
| 5 | Zeeman-Birefringence He-Ne Dual Frequency Lasers显示文摘We demonstrate an approach to obtain the frequency differences from 1 MHz to hundreds of MHz including 3-40 MHz, which was a blank range of the frequency difference in the traditional dual frequency lasers. We employ an intra-cavity stress-birefringence element in an He-Ne laser, and at the same time apply a transverse magnetic field to the laser. The intra-cavity stress birefringence element, which is the window plate or the mirror substrate applied by a force, is used to split a frequency into two;i.e. to make a single-frequency laser outputting two frequencies. Moreover, the transverse magnetic field is used to decrease greatly the mode competition between the two frequencies so that they are able to oscillate simultaneously. The minimum value of magnetic field for efficiently eliminating the mode competition to ensure the two frequencies working together is studied experimentally. The power tuning performance of the two frequencies (o-light and e-light) is investigated. | 金玉叶 张书练 李岩 郭继华 李加强 | 2001 | Chinese Physics Letters2001，18，4： | 6 |
| 6 | On the Misunderstanding of the Ziegler-Nichols's Formulae Usage显示文摘In the Ziegler-Nichols' s method of reaction curve,the proportional gain should be calculated as an inverse relation of the plant steady-state gain. One of the reasons behind this is to avoid an excessively high loop gain, which can jeopardize many required characteristics of the closed loop. However, many reports, scientific papers and books have been neglecting such gain compensation in the tuning formulae.This brief presents a comprehensive discussion about such uncompensated tuning rules. The main paper finding is that either the stability margin or the disturbance rejection is reduced in this case. A theoretical analysis is performed to obtain the main result. Moreover, a consistent simulation study is also performed to show the impact of the lack of compensation on performance. | Alexandro Garro Brito | 2019 | IEEE/CAA Journal of Automatica Sinica2019，6，1： | 5 |
| 7 | Nearly-Noncritical Phase Matching in MgO:LiNbO_(3) Optical Parametric Oscillators显示文摘We have proposed and demonstrated a nearly-noncritical phase-matched (NCPM) optical parametric oscillation (OPO) in an MgO:LiNbO_(3) crystal with 5 mol% MgO by temperature tuning. By giving up perfect NCPM, the practical tuning range for the OPO is increased by two times. For the crystal, the operated temperature decreases with the phase-matching angle at degeneracy. With a cutting angle of 82° instead of the noncritical case of 90°, the tuning range was increased. In order to obtain a sufficiently high output pulse energy for both signal and idler throughout the entire tuning range, five sets of mirrors were used for the resonator. The tuning range of the OPO was 800-1700 nm with temperatures tuning from 83°C to 224.2°C. The output energy was about 6.45 mJ with a conversion efficiency of nearly 13%. The bandwidth of the output was 1.0-L1 nm. | 姚建铨 于意仲 王鹏 王涛 张百钢 丁欣 陈进 H.J.Peng H.S.Kwok | 2001 | Chinese Physics Letters2001，18，9： | 5 |
| 8 | High-contrast,fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser显示文摘Coherent Raman scattering(CRS)microscopy is widely recognized as a powerful tool for tackling biomedical problems based on its chemically specific label-free contrast,high spatial and spectral resolution,and high sensitivity.However,the clinical translation of CRS imaging technologies has long been hindered by traditional solid-state lasers with environmentally sensitive operations and large footprints.Ultrafast fibre lasers can potentially overcome these shortcomings but have not yet been fully exploited for CRS imaging,as previous implementations have suffered from high intensity noise,a narrow tuning range and low power,resulting in low image qualities and slow imaging speeds.Here,we present a novel high-power self-synchronized two-colour pulsed fibre laser that achieves excellent performance in terms of intensity stability(improved by 50 dB),timing jitter(24.3 fs),average power fluctuation(<0.5%),modulation depth(>20 dB)and pulse width variation(<1.8%)over an extended wavenumber range(2700-3550 cm^(−1)).The versatility of the laser source enables,for the first time,high-contrast,fast CRS imaging without complicated noise reduction via balanced detection schemes.These capabilities are demonstrated in this work by imaging a wide range of species such as living human cells and mouse arterial tissues and performing multimodal nonlinear imaging of mouse tail,kidney and brain tissue sections by utilizing second-harmonic generation and twophoton excited fluorescence,which provides multiple optical contrast mechanisms simultaneously and maximizes the gathered information content for biological visualization and medical diagnosis.This work also establishes a general scenario for remodelling existing lasers into synchronized two-colour lasers and thus promotes a wider popularization and application of CRS imaging technologies. | Cihang Kong Christian Pilger Henning Hachmeister Xiaoming Wei Tom H.Cheung Cora S.W.Lai Nikki P.Lee Kevin K.Tsia Kenneth K.Y.Wong Thomas Huser | 2020 | Light(Science & Applications)2020，9，1： | 5 |
| 9 | Electro-Optically Switchable Optical True Delay Lines of Meter-Scale Lengths Fabricated on Lithium Niobate on Insulator Using Photolithography Assisted Chemo-Mechanical Etching显示文摘Optical true delay lines(OTDLs)of low propagation losses,small footprints and high tuning speeds and efficiencies are of critical importance for various photonic applications.Here,we report fabrication of electro-optically switchable OTDLs on lithium niobate on insulator using photolithography assisted chemo-mechanical etching.Our device consists of several low-loss optical waveguides of different lengths which are consecutively connected by electro-optical switches to generate different amounts of time delay.The fabricated OTLDs show an ultra-low propagation loss of^0.03dB/cm for waveguide lengths well above 100 cm. | 周俊霞 高仁宏 林锦添 汪旻 储蔚 李文博 尹狄峰 邓莉 方致伟 张健皓 伍荣波 程亚 | 2020 | Chinese Physics Letters2020，37，8： | 5 |
| 10 | A Real Time Self-Tuning Motion Controller for Mobile Robot Systems显示文摘This paper proposes an intelligent controller for motion control of robotic systems to obtain high precision tracking without the need for a real-time trial and error method.In addition, a new self-tuning algorithm has been developed based on both the ant colony algorithm and a fuzzy system for real-time tuning of controller parameters. Simulations and experiments using a real robot have been addressed to demonstrate the success of the proposed controller and validate the theoretical analysis. Obtained results confirm that the proposed controller ensures robust performance in the presence of disturbances and parametric uncertainties without the need for adjustment of control law parameters by a trial and error method. | Mohamed Boukens Abdelkrim Boukabou Mohammed Chadli | 2019 | IEEE/CAA Journal of Automatica Sinica2019，6，1： | 5 |
| 11 | Spontaneously coherent orbital coupling of counterrotating exciton polaritons in annular perovskite microcavities显示文摘Exciton-polariton condensation is regarded as a spontaneous macroscopic quantum phenomenon with phase ordering and collective coherence.By engineering artificial annular potential landscapes in halide perovskite semiconductor microcavities,we experimentally and theoretically demonstrate the room-temperature spontaneous formation of a coherent superposition of exciton-polariton orbital states with symmetric petal-shaped patterns in real space,resulting from symmetry breaking due to the anisotropic effective potential of the birefringent perovskite crystals.The lobe numbers of such petal-shaped polariton condensates can be precisely controlled by tuning the annular potential geometry.These petal-shaped condensates form in multiple orbital states,carrying locked alternating nphase shifts and vortex-anti vortex superposition cores,arising from the coupling of counterrotating exciton-polaritons in the confined circular waveguide.Our geometrically patterned microcavity exhibits promise for realizing room-temperature topological polaritonic devices and optical polaritonic switches based on periodic annular potentials. | Jun Wang Huawen Xu Rui Su Yutian Peng Jinqi Wu Timothy C.H.Liew Qihua Xiong | 2021 | Light(Science & Applications)2021，10，3： | 4 |
| 12 | Optical beam steering by using tunable,narrow-linewidth butt-coupled hybrid lasers in a silicon nitride photonics platform显示文摘Chip-scale,tunable narrow-linewidth hybrid integrated diode lasers based on quantum-dot RSOAs at 1.3μm are demonstrated through butt-coupling to a silicon nitride photonic integrated circuit.The hybrid laser linewidth is around 85 k Hz,and the tuning range is around 47 nm.Then,a fully integrated beam steerer is demonstrated by combining the tunable diode laser with a waveguide surface grating.Our system can provide beam steering of 4.1°in one direction by tuning the wavelength of the hybrid laser.Besides,a wavelength-tunable triple-band hybrid laser system working at^1,~1.3,and^1.55μm bands is demonstrated for wide-angle beam steering in a single chip. | YEYU ZHU SIWEI ZENG LIN ZHU | 2020 | Photonics Research2020，8，3： | 4 |
| 13 | Edge enhancement through scattering media enabled by optical wavefront shaping显示文摘Edge enhancement is a fundamental and important topic in imaging and image processing,as perception of edge is one of the keys to identify and comprehend the contents of an image.Edge enhancement can be performed in many ways,through hardware or computation.Existing methods,however,have been limited in free space or clear media for optical applications;in scattering media such as biological tissue,light is multiple scattered,and information is scrambled to a form of seemingly random speckles.Although desired,it is challenging to accom-plish edge enhancement in the presence of multiple scattering.In this work,we introduce an implementation of optical wavefront shaping to achieve efficient edge enhancement through scattering media by a two-step operation.The first step is to acquire a hologram after the scattering medium,where information of the edge region is accurately encoded,while that of the nonedge region is intentionally encoded with inadequate accuracy.The second step is to decode the edge information by time reversing the scattered light.The capability is demonstrated experimentally,and,further,the performance,as measured by the edge enhancement index(EI)and enhancement-to-noise ratio(ENR),can be controlled easily through tuning the beam ratio.EI and ENR can be reinforced by^8.5 and^263 folds,respectively.To the best of our knowledge,this is the first demonstration that edge information of a spatial pattern can be extracted through strong turbidity,which can potentially enrich the comprehension of actual images obtained from a complex environment. | ZIHAO LI ZHIPENG Yu HUI HUI HUANHAO LI TIANTING ZHONG HONGLIN LU PUXIANG LA | 2020 | Photonics Research2020，8，6： | 4 |
| 14 | Pristine PN junction toward atomic layer devices显示文摘In semiconductor manufacturing,PN junction is formed by introducing dopants to activate neighboring electron and hole conductance.To avoid structural distortion and failure,it generally requires the foreign dopants localize in the designated micro-areas.This,however,is challenging due to an inevitable interdiffusion process.Here we report a brand-new junction architecture,called'layer PN junction',that might break through such limit and help redefine the semiconductor device architecture.Different from all existing semiconductors,we find that a variety of van der Waals materials are doping themselves from n-to p-type conductance with an increasing/decreasing layer-number.It means the capability of constructing homogeneous PN junctions in monolayers'dimension/precision,with record high rectification-ratio(>10^(5))and low cut-off current(<1 pA).More importantly,it spawns intriguing functionalities,like gate-switchable-rectification and noise-signal decoupled avalanching.Findings disclosed here might open up a path to develop novel nanodevice applications,where the geometrical size becomes the only critical factor in tuning charge-carrier distribution and thus functionality. | Hui Xia Man Luo Wenjing Wang Hailu Wang Tianxin Li Zhen Wang Hangyu Xu Yue Chen Yong Zhou Fang Wang Runzhang Xie Peng Wang Weida Hu Wei Lu | 2022 | Light(Science & Applications)2022，11，7： | 4 |
| 15 | Epsilon-near-zero photonics:infinite potentials显示文摘With its unique and exclusive linear and nonlinear optical characteristics,epsilon-near-zero(ENZ)photonics has drawn a tremendous amount of attention in the recent decade in the fields of nanophotonics,nonlinear optics,plasmonics,light-matter interactions,material science,applied optical science,etc.The extraordinary optical properties,relatively high tuning flexibility,and CMOS compatibility of ENZ materials make them popular and competitive candidates for nanophotonic devices and on-chip integration in all-optical and electro-optical platforms.With exclusive features and high performance,ENZ photonics can play a big role in optical communications and optical data processing.In this review,we give a focused discussion on recent advances of the theoretical and experimental studies on ENZ photonics,especially in the regime of nonlinear ENZ nanophotonics and its applications.First,we overview the basics of the ENZ concepts,mechanisms,and nonlinear ENZ nanophotonics.Then the new advancements in theoretical and experimental optical physics are reviewed.For nanophotonic applications,the recent decades saw rapid developments in various kinds of different ENZ-based devices and systems,which are discussed and analyzed in detail.Finally,we give our perspectives on where future endeavors can be made. | JIAYE WU ZE TAO XIE YANHUA SHA H.Y.FU QIAN LI | 2021 | Photonics Research2021，9，8： | 4 |
| 16 | Program-controlled single soliton microcomb source显示文摘Soliton microcombs(SMCs)are spontaneously formed in a coherently pumped high-quality microresonator,which provides a new tool for use as an on-chip frequency comb for applications of high-precision metrology and spectroscopy.However,generation of SMCs seriously relies on advanced experimental techniques from professional scientists.Here,we experimentally demonstrate a program-controlled single SMC source where the intracavity thermal effect is timely balanced using an auxiliary laser during single SMC generation.The microcomb power is adopted as the criteria for microcomb states discrimination and a forward and backward thermal tuning technique is employed for the deterministic single SMC generation.Further,based on a closed-loop control system,the repetition rate stability of the SMC source improved more than 20 times and the pump frequency can be continuously tuned by simply changing the operation temperature.The reliability of the SMC source is verified by consecutive 200 generation trials and maintaining over 10 h.We believe the proposed SMC source will have significant promising influences in future SMC-based application development. | XINYU WANG PENG XIE WEIQIANG WANG YANG WANG ZHIZHOU LU LEIRAN WANG SAI TCHU BRENT ELITTLE WEI ZHAO WENFU ZHANG | 2021 | Photonics Research2021，9，1： | 4 |
| 17 | Continuous roll-to-roll patterning of three-dimensional periodic nanostructures显示文摘In this work,we introduce a roll-to-roll system that can continuously print three-dimensional(3D)periodic nanostructures over large areas.This approach is based on Langmuir-Blodgett assembly of colloidal nanospheres,which diffract normal incident light to create a complex intensity pattern for near-field nanolithography.The geometry of the 3D nanostructure is defined by the Talbot effect and can be precisely designed by tuning the ratio of the nanosphere diameter to the exposure wavelength.Using this system,we have demonstrated patterning of 3D photonic crystals with a 500 nm period on a 50×200 mm^(2) flexible substrate,with a system throughput of 3mm/s.The patterning yield is quantitatively analyzed by an automated electron beam inspection method,demonstrating long-term repeatability of an up to 88% yield over a 4-month period.The inspection method can also be employed to examine pattern uniformity,achieving an average yield of up to 78.6% over full substrate areas.The proposed patterning method is highly versatile and scalable as a nanomanufacturing platform and can find application in nanophotonics,nanoarchitected materials,and multifunctional nanostructures. | I-Te Chen Elizabeth Schappell Xiaolong Zhang Chih-Hao Chang | 2020 | Microsystems & Nanoengineering2020，6，1： | 4 |
| 18 | Widely tunable,heterogeneously integrated quantum-dot O-band lasers on silicon显示文摘Heterogeneously integrated lasers in the O-band are a key component in realizring low-power optical interconnects for data centers and high-performance computing.Quantum-dot-based materials have been particularly appealing for light generation due to their ultralow lasing thresholds,small linewidth enhancement factor,and low sensitivity to reflections.Here,we present widely tunable quantum-dot lasers heterogencously integrated on silicon-on-insulator substrate.The tuning mechanism is based on Vernier dual-ring geometry,and a 47nm tuning range with 52 dB side-mode suppression ratio is observed.These parameters show an increase to 52nm and 58 dB,respectively,when an additional wavelength filter in the form of a Mach-Zehnder interferometer is added to the cavity.The Lorentzian linewidth of the lasers is measured as low as 5.3 kHz. | ADITYA MALIK JOEL GUO MINH A.TRAN GEZA KURCZVEIL DI LIAN JOHN EBOWERS | 2020 | Photonics Research2020，8，10： | 4 |
| 19 | Explaining the influence of dopant concentration and excitation power density on the luminescence and brightness of β-NaYF4:Yb^3+,Er^3+ nanoparticles:Measurements and simulations显示文摘We assessed the influence of Yb^3+ and Er34 dopant concentration on the relative spectral distribution, quantum yield (Фuc), and decay kinetics of the upconversion luminescence (UCL) and particle brightness (BUC) for similarly sized (33 nm) oleate-capped p-NaYF4:Yb3t,Er^3+ upconversion (UC) nanoparticles (UCNPs) in toluene at broadly varied excitation power densities (F). This included an Yb^3+ series where the Yb^3+ concentration was varied between 11%—21% for a constant Er^3+ concentration of 3%, and an Er^3+ series, where the Er^3+ concentration was varied between 1%-4% for a constant Yb^3+ concentration of 14%. The results were fitted with a coupled rate equation model utilizing the UCL data and decay kinetics of the green and red Er34 emission and the Yb34 luminescence at 980 nm. An increasing Yb34 concentration favors a pronounced triphotonic population of 4F9/2 at high P by an enhanced back energy transfer (BET) from the 4G11/2 level. Simultaneously, the Yb^3+-controlled UCNPs absorption cross section overcompensates for the reduction in Фuc with increasing Yb^3+ concentration at high P, resulting in an increase in Sue. Additionally, our results show that an increase in Yb34 and a decrease in Er^3+ concentration enhance the color tuning range by P. These findings will pave the road to a deeper understanding of the energy transfer processes and their contribution to efficient UCL, as well as still debated trends in green-to-red intensity ratios of UCNPs at different P. | Martin Kaiser Christian Wurth Marco Kraft Tero Soukka Ute Resch-Genger | 2019 | Nano Research2019，12，8： | 3 |
| 20 | Manipulation of blue TADF top-emission OLEDs by the first-order optical cavity design:toward a highly pure blue emission and balanced charge transport显示文摘The broad luminescence spectrum of a thermally activated delayed fluorescence(TADF)organic light-emitting diode(OLED)is a critical issue to overcome for its application in high-color-purity displays.Herein,a novel device structure that utilizes the first-order microcavity optical mode with a high radiance intensity is demonstrated to solve this problem by considering the charge transport properties through the analysis of hole-only and electron-only devices.In addition,by tuning the optical interference near the semitransparent top cathode layers consisting of thin silver and organic capping layers,light extraction is increased by nearly 2 times compared to the device without a capping layer.Consequently,the optimized blue TADF top-emission OLED exhibits much lower full width at half-maximum,higher maximum current efficiency,and external quantum efficiency compared to the device before optimization.This approach is expected to provide a simple but effective way to further enhance the spectral purity of the conventional TADF-based OLEDs. | WANQI REN KYUNG ROCK SON TAE HOON PARK VIGNESH MURUGADOSS TAE GEUN KIM | 2021 | Photonics Research2021，9，8： | 3 |
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