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A vectorial model for the nonlinear gradient force exerted on metallic Rayleigh nanoparticles

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Chinese Optics Letters 2024年第2期22卷 207-213页

作者：朱政张聿全闵长俊 Aurèle J.LAdam H.Paul Urbach 袁小聪 Research Center for humanoid Sensing Research Institute of Intelligent SensingZhejiang LabHangzhou 311100China Nanophotonics Research Center Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China Optics Research Group ImPhys DepartmentFaculty of Applied SciencesDelft University of TechnologyDelft 2628 CJThe Netherlands

Optical tweezers have proved to be a powerful tool with a wide range of *** gradient force plays a vital role in the stable optical trapping of *** scalar method is convenient and effective for analyzing the gradient force in traditional optical ***,when the third-order nonlinear effect of the nano-object is stimulated,the scalar method cannot adequately present the optical response of the metal nanoparticle to the external optical ***,we propose a theoretical model to interpret the nonlinear gradient force using the vector *** combining the optical Kerr effect,the polarizability vector of the metallic nanoparticle is derived.A quantitative analysis is obtained for the gradient force as well as for the optical potential *** vector method yields better agreement with reported experimental *** suggest that this method could lead to a deeper understanding of the physics relevant to nonlinear optical trapping and binding phenomena.

关键词： gradient forces nonlinear effect metallic nanoparticles

Phosphate-Bismuthate Glass and Fiber with Heavy Doping of Silver Nanoparticles(Invited)

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激光与光电子学进展 2024年第3期61卷 168-177页

作者： Chen Fuguang Jiang Bofan Chen Zhi Ma Siyuan Huang Yupeng Zhang Hang Ma Zhijun Research Center for humanoid Sensing Zhejiang LabHangzhou 311121ZhejiangChina State Key Laboratory of Luminescent Materials and Devices School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyang 621900SichuanChina

Glass with heavy doping of noble metal nanoparticles is expected to exhibit high optical *** this study,the effects of glass composition,structure,and heat treatment on the formation of silver nanoparticles(Ag NPs)in phosphate-bismuthate(PB)glass are *** optimizing the chemical composition and preparation parameters,strong localized surface plasmon resonance is achieved in the PB glass with a silver mass fraction of more than 13%,which is 20 and 6 times higher than that in bismuthate and phosphate glasses reported previously,*** high solubility of the phosphate component and the self-reduction effect of the bismuthate component jointly contributed to the stability and high content of Ag NPs in the PB glass.Z-scan measurements show that such heavy doping PB glass has a reverse saturable absorption coefficient of-14×10^(-12)m·W^(-1)and a saturable absorption coefficient of 4.94×10^(-12)m·W^(-1)at 800 ***,the heavy doping PB glass exhibits excellent thermal stability,making it promising for the fabrication of nonlinear optical *** addition,with a heavily silver-doped PB glass rod as the core and a commercial silicate glass tube as the cladding,a composite glass fiber with high Ag-NP doping is successfully fabricated using a“molten-core”fiber drawing method.

关键词： phosphate-bismuthate glass silver nanoparticle optical nonlinearity molten-core fiber drawing

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

Optical spiral vortex from azimuthally increasing/decreasing exponential phase gradients

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Chinese Optics Letters 2023年第11期21卷 123-127页

作者：介珮桦谢振威袁小聪 Nanophotonics Research Centre Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China Research Center for humanoid Sensing Zhejiang LaboratoryHangzhou 311100China

A new type of power-exponent-phase vortex-like beams with both quadratic and cubic azimuthal phase gradients is investigated in this *** intensity and orbital angular momentum(OAM)density distributions are noticeably different when the phase gradient increases or decreases along the azimuth angle,while the orthogonality and total OAM remain *** characteristics of the optical field undergo a significant change when the phase shifts from linear to nonlinear,with the variation of the power index having little impact on the beam characteristics under nonlinear phase *** characteristics provide new ideas for applications such as particle manipulation,optical communications,and OAM encryption.

关键词： optical vortex orbital angular momentum optical spiral azimuthally varying phase gradient

Nonlinear optical trapping effect with reverse saturable absorption

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Advanced Photonics 2023年第4期5卷 66-73页

作者： Zheng Zhu Yuquan Zhang Shuoshuo Zhang Aurele J.L.Adam Changjun Min Hendrik Paul Urbach Xiaocong Yuan Shenzhen University Institute of Microscale Optoelectronics and State Key Laboratory of Radio Frequency Heterogeneous IntegrationNanophotonics Research CenterShenzhenChina Research Institute of Intelligent Sensing Research Center for Humanoid SensingZhejiang LabHangzhouChina Delft University of Technology Optics Research GroupDelftThe Netherlands

Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With thegradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise insequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps,however, the underlying physical mechanism is mainly confined within the SA regime because thresholdvalues required to excite the RSA regime are extremely high. Herein, we demonstrate, both in theory andexperiment, nonlinear optical tweezing within the RSA regime, proving that a fascinating composite trappingstate is achievable at ultrahigh intensities through an optical force reversal induced through nonlinearabsorption. Integrated results help in perfecting the nonlinear optical trapping system, thereby providingbeneficial guidance for wider applications of nonlinear optics.

关键词： nonlinear optical tweezers optical force reverse saturable absorption

Controller design based on viscoelasticity dynamics model and experiment for flexible drive unit

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Journal of Central South University 2014年第12期21卷 4468-4477页

作者：吴伟国侯月阳 humanoid and Gorilla Robot & Its Intelligent Motion Control Lab Harbin Institute of Technology

In order to ensure that the system has the advantage of light weight and vibration absorption, the steel rope is used as a flexible transmission part. A flexible drive unit(FDU) is developed, whose features are guided by steel rope, increasing force by the movable pulley group, modular, convenient and flexible. Dynamics model for controller is deduced based on the constitutive equation of viscoelasticity. Controller is designed for position control and is based on the viscoelasticity dynamics model compensation control strategy proposed. The control system is based on the TURBO PMAC multi-axis motion control *** loading experiments and velocity experiments results show that the FDU can reach 2 Hz with no load and the max speed of 30(°)/s. The FDU has the capability of the load torque 11.2 N·m and the speed of 24(°)/s simultaneously, and the frequency response is 1.3 Hz. The FDU can be used to be the pitch joint of hip for biped robot whose walking speed is 0.144 km/h theoretically.

关键词：弹性动力学模型控制器设计驱动单元实验粘弹性动力学多轴运动控制卡最大速度控制系统

Highly efficient,tunable,ultrabroadband NIR photoemission from Bi-doped nitridated germanate glasses toward all-band amplification in optical communication

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Chinese Optics Letters 2023年第5期21卷 63-69页

作者：陈福广陈智邱建荣张帅马志军 Research Center for humanoid Sensing Zhejiang LabHangzhou 311121China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Chinese Medical University Hangzhou 311100China

Bismuth(Bi)-doped near-infared(NIR)glass that can cover the entire optical communication window(850,1310,and1550 nm)has become the subject of extensive research for developing photonic devices,particularly,tunable fiber lasers and ultrabroadband optical ***,the realization of highly efficient NIR luminescence from Bi-doped glass is still full of ***,due to the co-existence of multiple Bi NIR centers in the glass,the origin of newly generated Bi NIR emission peaks at~930 and~1520 nm is still ***,we report a new Bi-doped nitridated germanate glass with tunable ultrabroadband NIR emission(850–1700 nm)and high external quantum efficiency(EQE)of~50%.A series of studies,including spectral analysis,nuclear magnetic resonance(NMR),and others,provide powerful evidence for the mechanism of luminescence enhancement and tunability,and make reasonable inferences about the origin of the new emission bands at~930 and~1520 *** believe that the results discussed above would enrich our understanding about multiple Bi NIR emission behaviors and contribute to the design and fabrication of highly efficient Bi-doped ultrabroadband wavelength-tunable optical glass fiber amplifiers and lasers in the future.

关键词： bismuth germanate glass near-infrared luminescence

On-chip sorting of orbital angular momentum beams using Bloch surface wave structures

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Photonics Research 2023年第11期11卷 1959-1974页

作者： NANNAN LI QI ZOU YIZHI LAN YAQI WANG JUN ZHANG MICHAEL SOMEKH CHANGJUN MIN FU FENG XIAOCONG YUAN Nanophotonics Research Center Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China Research Center for humanoid Sensing Zhejiang LabHangzhou 311100China Faculty of Engineering University of NottinghamNottingham NG72RDUK

Owing to their unique optical properties and new degrees of freedom,orbital angular momentum(OAM)beams have been applied in various *** of the topological charges(TCs)of OAM beams is the key step for their ***,on-chip sorting of OAM beams with large TCs still remains a *** this paper,Bloch surface wave(BSW)structures with five semi-ring shaped nanoslits are modeled.A spatial separation of 135 nm on the chip is obtained between two neighboring OAM *** beams with TCs up to 35 can be successfully sorted by the BSW structures,which is much larger than that using metallic structures(only seven).BSW structures exhibit better OAM sorting performances than metallic *** systematically show how the lower attenuation of BSW structures leads to far superior separation ability compared to surface plasmons propagating on metallic *** addition,sorting of two OAM beams with different TCs simultaneously can be achieved in this *** results reveal that BSW structures should be an excellent solution for OAM sorting with large TCs,which is beneficial for applications in integrated on-chip devices and optical communications.

关键词： sorting momentum Bloch

A new member of the structured light family:optical spatiotemporal vortices

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Light(Science & Applications) 2023年第10期12卷 2003-2005页

作者： Fu Feng Xiaocong Yuan Research Center for humanoid Sensing Zhejiang LabHangzhou 311100China Nanophotonics Research Centre Shenzhen UniversityShenzhen 518060China

The burgeoning growth of structured light has opened up new possibilities for harnessing the spatiotemporal coupling effects in *** spatiotemporal vortices,as a subset of spatiotemporal light,have emerged as a focal point of recent research,owing to their distinctive characteristics and vast range for *** unique structured light will endow photons with a new degree of freedom,promising to revolutionize researchers’understanding of *** thorough research on optical spatiotemporal vortices will establish a solid foundation for the development of innovative physical mechanisms and advanced applications in photonics.

关键词： light subset optical