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Full-color flexible laser displays based on random laser arrays

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Science China Materials 2021年第11期64卷 2805-2812页

作者： Yue Hou Zhonghao Zhou Chunhuan Zhang Ji Tang Yuqing Fan Fa-Feng Xu Yong Sheng Zhao Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Flexible laser display is a critical component for an information output port in next-generation wearable *** far,the lack of appropriate display panels capable of providing sustained operation under rigorous mechanical conditions impedes the development of flexible laser displays with high *** to the multiple scattering feedback mechanism,random lasers render high mechanical flexibility to withstand deformation,thus making them promising candidates for flexible display ***,the inability to obtain pixelated random laser arrays with highly ordered emissive geometries hinders the application of flexible laser displays in the wearable ***,for the first time,we demonstrate a mass fabrication strategy of full-color random laser arrays for flexible display *** feedback closed loops can be easily fulfilled in the pixels by multiple scatterings to generate durative random *** to the sustained operation of random laser,the display performance was well-maintained under mechanical deformations,and as a result,a flexible laser display panel was *** finding will provide a guidance for the development of flexible laser displays and laser illumination devices.

关键词： perovskite nanocrystals random laser microlaser arrays flexible displays laser displays

A corona modulation device structure and mechanism based on perovskite quantum dots random laser pumped using an electron beam

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Frontiers of Optoelectronics 2020年第3期13卷 291-302页

作者： Yan ZHU Yining MU Fanqi TANG Peng DU Hang REN School of Science Changchun University of Science and TechnologyChangchun 130022China

Although laser pumping using electron beam(EB)has high transient power output and easy modulation based on perovskite quantum dot(PQD)film,its lasing emitting direction is the same as the pumped EB's ***,realizing the conventional direct device structure through the film lasing mechanism is extremely ***,using the random lasing principle,herein,we proposed a corona modulation device structure based on PQDs random laser pumped using an *** discussed and stimulated the optimized designed method of the device in terms of parameters of the electronic optical device and the utilization ratio of output power and its modulation extinction ratio,*** to the simulation results,this type of device structure can effectively satisfy the new random lasing mechanism in terms of high-speed and high-power modulation.

关键词： corona modulation perovskite quantum dot(PQD) random laser electron beam(EB)

Ultra-high speed random bit generation based on Rayleigh feedback assisted ytterbium-doped random fiber laser

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Science China(Technological Sciences) 2021年第6期64卷 1295-1301页

作者： WU Han XIONG Ji HAN Bing WANG ZiNan ZHANG WeiLi JIA XinHong LIANG HouKun College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China Key Lab of Optical Fiber Sensing&Communications University of Electronic Science&Technology of ChinaChengdu 611731China School of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China

In this paper, we propose an ultra-high speed random bit generator without the time-delay signature based on an ytterbium-doped random fiber laser(YRFL) with Rayleigh scattering feedback. The spectrum of the YRFL has a relatively broad bandwidth(0.35 nm) and the lasing temporal intensity shows random fluctuations without cavity induced time-delay signatures(TDS),which are essential for ultra-high speed random bit generation. The chaotic signal and its time-delayed signal sampling at40 Giga samples per second(GS/s) are converted to digital 8-bit signals. By selecting 5 least significant bits from each 8-bit digital signal and using bitwise exclusive-OR operation, we experimentally achieve 200 Gbps physical random bit generation based on ytterbium-doped random fiber laser with the verified randomness. The combination of broadband emission and free of TDS makes random fiber lasers new promising sources for high performance random bit generation in a simple and compact configuration, which has a great potential in cryptography and secure communication applications.

关键词： random fiber laser Rayleigh scattering random bit generation random laser

Picosecond gain-switched polymer fiber random lasers

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Chinese Optics Letters 2024年第4期22卷 20-25页

作者：杜文彧高森张小娟李思祺蒯雁王治强曹志刚徐峰刘宇徐林张俊喜谢康俞本立胡志家 Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of EducationSchool of Physics and Opto-electronics EngineeringAnhui UniversityHefei 230601China School of Instrument Science and Opto-electronics Engineering Laboratory of Optical Fibers and Micro-nano PhotonicsHefei University of TechnologyHefei 230009China School of Opto-electronic Engineering Zaozhuang UniversityZaozhuang 277160China

random lasers are a type of lasers that lack typical resonator structures,offering benefits such as easy integration,low cost,and low spatial *** features make them popular for speckle-free imaging and random number ***,due to their high threshold and phase instability,the production of picosecond random lasers has still been a *** this work,we have developed three dyes incorporating polymer optical fibers doped with various scattering nanoparticles to produce short-pulsed random fiber ***,stable picosecond random laser emission lasting600 ps is observed at a low pump energy of 50μJ,indicating the gain-switching *** inversion and gain undergo an abrupt surge as the intensity of the continuously pumped light nears the threshold *** the intensity of the continuously pumped light reaches a specific value,the number of inversion populations in the“scattering cavity”surpasses the threshold *** results based on a model that considers power-dependent gain saturation confirmed the above *** research helps expand the understanding of the dynamics behind random medium-stimulated emission in random lasers and opens up possibilities for mode locking in these systems.

关键词： random laser polymer optical fiber gain-switched laser picosecond pulse

High-peak-power random Yb-fiber laser with intracavity Raman-frequency comb generation

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High Power laser Science and Engineering 2023年第1期11卷 82-89页

作者： Xinxing Liu Wenhui Hao Zhihui Yang Yulong Tang Key Laboratory for laser Plasmas(MOE) School of Physics and AstronomyCollaborative Innovation Center of IFSAShanghai Jiao Tong UniversityShanghaiChina

The random fiber laser(RFL)has been an excellent platform for exploring novel optical dynamics and developing new functional optoelectronic ***,it is challenging for RFLs to regulate their emission into regular narrow pulses due to their intrinsic ***,through engineering the laser configuration(cavity Q value,gain distribution and nonlinearity),we demonstrate that narrow(~2.5 ns)pulses with record peak power as high as 64.3 kW are achieved from a self-Q-switched random ytterbium fiber *** on high intracavity intensity and efficient interplay of multiple nonlinear processes(stimulated Brillouin scattering,stimulated Raman scattering and four-wave mixing),an over-one-octave visible-near-infrared(NIR)Raman-frequency comb is generated from single-mode silica fibers for the first *** spectrally filtering the Raman peaks,wavelength-tunable pulses with durations of several hundreds of picoseconds are *** a high-peak-power random Q-switched fiber laser and wide frequency comb in the visible-NIR region can find applications in diverse areas,such as spectroscopy,biomedical imaging and quantum information.

关键词： high peak power Q-switched fiber laser Raman-frequency comb random laser visible-near-infrared

Programmable complex pumping field induced color-on-demand random lasing in fiber-integrated microbelts for speckle free imaging

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Science China(Information Sciences) 2023年第12期66卷 251-260页

作者： Xiaoyu SHI Kaiyue SHEN Yaoxing BIAN Wanting SONG Jun RUAN Zhaona WANG Tianrui ZHAI College of Physics and Optoelectronics Faculty of ScienceBeijing University of Technology Applied Optics Beijing Area Major Laboratory Department of PhysicsBeijing Normal University

Miniaturized lasers with on-demand color emission have immense potential in the development of integrated imaging sources. random lasers(RLs) with cavity-free structures and low spatial coherence are promising candidates for multicolor imaging sources. However, the wide tuning range and high tuning accuracy of continuous and reversible random lasing color with a defined emissive direction remain challenging. Here, random lasing with on-demand color emission and defined emissive direction is realized in fiber-integrated microbelts through programmable pumping. Individual RL microbelts as RL units doped with blue(B)-, green(G)-, and red(R)-emissive dyes and titanium dioxide nanoparticles are assembled on an optical fiber, resulting in high-performance B/G/R lasing. The optical fiber functions as a waveguide that guides the multicolor RL to ensure a defined directional emission. By manipulating the combination of the B/G/R RL units on the waveguide, distinctive lasing colors covering the entire visible spectrum are obtained, including white-colored random lasing. To realize dynamically controllable lasing for on-demand color emission, a pumping strategy with programmable excitation is proposed by shaping the pump beams into different beam arrays for precisely pumping the RL unit combination. We envision that fiber-integrated RL sources can be implemented in various imaging applications, such as biomedical diagnosis, multiplexed communication, and optical sensing.

关键词： random laser multi-color pump control fiber-integrated directional emission

Transverse localization of Tamm plasmon in metal-DBR structure with disordered layer

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Chinese Physics B 2018年第8期27卷 25-29页

作者： Deng-Ju He Wei-Li Zhang Rui Ma Shah-Shah Wang Xiao-Min Wu Yun-Jiang Rao Key Laboratory of Optical Fiber Sensing and Communications（Education Ministry of China）University of Electronic Science and Technology of China Chengdu 611731China

Transverse localization of the optical Tamm plasmon （OTP） is studied in a metal-distributed Bragg reflector （DBR） structure with a one-dimensional disordered layer embedded at the interface between the metal and the DBR. The embed- ded disordered layer induces multiple scattering and interference of light, forming the light localization in the transverse direction. This together with the formation of Tamm plasmonic modes at the metal-DBR interface （i.e., the confinement of light in the longitudinal direction）, gives birth to the so called transverse-localized Tamm plasmon. It is shown that for both transverse electric （TE） and transverse magnetic （TM） polarized light injection, the excited transverse-localized Tamm plas- mon broadens and splits the dispersion curve due to spatial incoherence in the transverse direction, thus proving the stronger light confinement especially in the TE polarized injection. By adding the gain medium, specific random lasing modes are observed. The proposed study could be an efficient way of trapping and locally enhancing light on a subwavelength scale, which is useful in applications of random lasers, optical sensing, and imaging.

关键词： optical Tamm plasmon light localization random laser distributed Bragg reflector

Hot spots enriched plasmonic nanostructure-induced random lasing of quantum dots thin film

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Chinese Physics B 2018年第4期27卷 497-502页

作者： Feng Shan Xiao-Yang Zhang Jing-Yuan Wu Tong Zhang Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and Engineering Southeast University Nanjing 210096 China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education and School of Instrument Science and Engineering Southeast University Nanjing 210096 China Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology Suzhou Research Institute of Southeast University Suzhou 215123 China

Here,a plasmon-enhanced random laser was achieved by incorporating gold nanostars（NS） into disordered polymer and Cd Se/Zn S quantum dots（QDs） gain medium films,in which the surface plasmon resonance of gold NS can greatly enhance the scattering cross section and bring a large gain *** random distribution of gold NS in the gain medium film formed a laser-mode *** a single-pulse pumping,the scattering center of gold NS-based random laser exhibits enhanced performance of a lasing threshold of 0.8 m J/cm^2 and a full width as narrow as 6 nm at half *** utilizing the local enhancement characteristic of the electric field at the sharp apexes of the gold NS,the emission intensity of the random laser was *** addition,the gold NS showed higher thermal stability than the silver nanoparticles,withstanding high temperature heating up to 200？*** results of metal nanostructures with enriched hot spots and excellent temperature stability have tremendous potential applications in the fields of biological identification,medical diagnostics,lighting,and display devices.

关键词： plasmon gain medium gold nanostars random laser

Flexible electrically pumped random lasing from ZnO nanowires based on metal–insulator–semiconductor structure

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Chinese Physics B 2017年第6期26卷 346-351页

作者：阙妙玲王贤迪彭轶瑶潘曹峰 Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences National Center for Nanoscience and Technology (NCNST) Beijing 100083 China

Flexible electrically pumped random laser（RL） based on ZnO nanowires is demonstrated for the first time to our knowledge. The ZnO nanowires each with a length of 5 μm and an average diameter of 180 nm are synthesized on flexible substrate（ITO/PET） by a simple hydrothermal method. No obvious visible defect-related-emission band is observed in the photoluminescence（PL） spectrum, indicating that the ZnO nanowires grown on the flexible ITO/PET substrate have few defects. In order to achieve electrically pumped random lasing with a lower threshold, the metal–insulator–semiconductor（MIS） structure of Au/SiO2/ZnO on ITO/PET substrate is fabricated by low temperature process. With sufficient forward bias, the as-fabricated flexible device exhibits random lasing, and a low threshold current of ～ 11.5 m A and high luminous intensity are obtained from the ZnO-based random laser. It is believed that this work offers a case study for developing the flexible electrically pumped random lasing from ZnO nanowires.

关键词： flexible random laser ZnO nanowires MIS structure