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学者姓名:杨树明

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Plasmonic interference modulation for broadband nanofocusing EI SCIE
期刊论文 | 2021 , 10 (16) , 4113-4123 | NANOPHOTONICS
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Abstract :

Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500-800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies. without

Keyword :

asymmetric slits broadband nanofocusing plasmonic modulation po-larization rotation circumference interference

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GB/T 7714 Li, Shaobo , Yang, Shuming , Wang, Fei et al. Plasmonic interference modulation for broadband nanofocusing [J]. | NANOPHOTONICS , 2021 , 10 (16) : 4113-4123 .
MLA Li, Shaobo et al. "Plasmonic interference modulation for broadband nanofocusing" . | NANOPHOTONICS 10 . 16 (2021) : 4113-4123 .
APA Li, Shaobo , Yang, Shuming , Wang, Fei , Liu, Qiang , Cheng, Biyao , Rosenwaks, Yossi . Plasmonic interference modulation for broadband nanofocusing . | NANOPHOTONICS , 2021 , 10 (16) , 4113-4123 .
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Multi-band enhanced graphene photodetector based on localized surface plasmon EI SCIE
期刊论文 | 2021 , 322 | Sensors and Actuators, A: Physical
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Abstract :

In this paper, a graphene photodetector modified with both gold nanoparticles and silver nanoparticles was discussed. The performance of the photodetector was improved by the common electrode structure prepared by transferring graphene on the top of the device. The gold nanoparticles and silver nanoparticles prepared via the annealing process can excite localized surface plasmon under illumination, and the photoresponse of the photodetector in the wavelength range of 400−470 nm and 510−620 nm. The responsivity increased by up to 2.8 times. As the photosensitive material, graphene on the top participated in photoelectric response, improving the performance of the photodetector in the wavelength range of 400−850 nm, and realized 1.4–1.5 times performance improvement in the wide-band range. Through the above improvements, the responsivity of the photodetector under 400−470 nm and 510−620 nm illumination increased by 2–4 times; the specific detectivity under 450 nm illumination increased by 2.7 times, and the external quantum efficiency increased by 400 %. Therefore, the photodetector can achieve enhancement in its multi-band selective response and improvement in its optical detection performance in a wide-band range. © 2021 Elsevier B.V.

Keyword :

Surface plasmon resonance Silver nanoparticles Surface plasmons Photodetectors Metal nanoparticles Graphene Gold nanoparticles Fiber optic sensors Photons

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GB/T 7714 Suo, Hao , Yang, Shuming , Ji, Peirui et al. Multi-band enhanced graphene photodetector based on localized surface plasmon [J]. | Sensors and Actuators, A: Physical , 2021 , 322 .
MLA Suo, Hao et al. "Multi-band enhanced graphene photodetector based on localized surface plasmon" . | Sensors and Actuators, A: Physical 322 (2021) .
APA Suo, Hao , Yang, Shuming , Ji, Peirui , Wang, Yiming . Multi-band enhanced graphene photodetector based on localized surface plasmon . | Sensors and Actuators, A: Physical , 2021 , 322 .
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A Robust Optical Flow Tracking Method Based On Prediction Model for Visual-Inertial Odometry EI SCIE
期刊论文 | 2021 , 6 (3) , 5581-5588 | IEEE ROBOTICS AND AUTOMATION LETTERS
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Abstract :

Indirect method is widely used in the field of visual SLAM at present, and it can be divided into feature matching method and optical flow tracking method according to whether matching descriptors are needed in the tracking process. Compared to feature matching method, optical flow does not need to spend too much time on calculating and matching feature points, but it is easy to be affected by illumination changes and fast motion. In recent years, the visual-inertial fusion method improves the localization accuracy and robustness on the condition that the illumination is poor or image blur caused by fast motion. A robust optical flow tracking method based on prediction model for visual-inertial odometry is proposed in this letter. A new optical flow and brightness correction method based on a linear illumination model is used to deal with the large changes of illumination. We also proposed an initial optical flow prediction method with the pre-integration of IMU and reprojection model between image frames to make the optical flow more robust. The results of optical flow are also used to judge the image quality of specific areas to make sure the extracted feature points are more stable and suitable for tracking. Finally, the method is proved that can outperform other state-of-the-art VIO methods in experiments on the public benchmark even without loop closure.

Keyword :

localization illumination changes optical flow Visual-Inertial SLAM

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GB/T 7714 Zhu, Shengnan , Yang, Shuming , Hu, Pengyu et al. A Robust Optical Flow Tracking Method Based On Prediction Model for Visual-Inertial Odometry [J]. | IEEE ROBOTICS AND AUTOMATION LETTERS , 2021 , 6 (3) : 5581-5588 .
MLA Zhu, Shengnan et al. "A Robust Optical Flow Tracking Method Based On Prediction Model for Visual-Inertial Odometry" . | IEEE ROBOTICS AND AUTOMATION LETTERS 6 . 3 (2021) : 5581-5588 .
APA Zhu, Shengnan , Yang, Shuming , Hu, Pengyu , Qu, Xing . A Robust Optical Flow Tracking Method Based On Prediction Model for Visual-Inertial Odometry . | IEEE ROBOTICS AND AUTOMATION LETTERS , 2021 , 6 (3) , 5581-5588 .
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Axial intensity distribution of a micro-Fresnel zone plate at an arbitrary numerical aperture EI SCIE
期刊论文 | 2021 , 29 (8) , 12093-12109 | OPTICS EXPRESS
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The axial focus number (the number of focal spots along the axial direction) and focus intensity of a micro-Fresnel zone plate (FZP) are analyzed from deep ultraviolet to infrared using the Fourier decomposition, the vectorial angular spectrum (VAS) theory, and the three-dimensional finite-difference time-domain (FDTD) method. For a low-numerical aperture (NA) micro-FZP (NA<0.1), there are multiple axial high-order foci, and the intensity of each focus decreases slowly. However, the intensity of each high-order focus decreases rapidly with NA increasing. For a relatively high-NA micro-FZP (NA>0.3), the axial high-order foci are suppressed and there is one single focus. A fast, precise, and cost-efficient additive manufacturing method, i.e. two-photon polymerization, is used to fabricate high-NA phase-type micro-FZPs. The experiment has validated the phenomenon of linear negative focal shift of a high-NA micro-FZP. This property can be particularly applied in precise measurement of micro-displacement, film thickness, micro/nano step height, and wavelength. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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GB/T 7714 Liu, Qiang , Liu, Tao , Yang, Shuming et al. Axial intensity distribution of a micro-Fresnel zone plate at an arbitrary numerical aperture [J]. | OPTICS EXPRESS , 2021 , 29 (8) : 12093-12109 .
MLA Liu, Qiang et al. "Axial intensity distribution of a micro-Fresnel zone plate at an arbitrary numerical aperture" . | OPTICS EXPRESS 29 . 8 (2021) : 12093-12109 .
APA Liu, Qiang , Liu, Tao , Yang, Shuming , Li, Guoqing , Li, Shaobo , He, Tao . Axial intensity distribution of a micro-Fresnel zone plate at an arbitrary numerical aperture . | OPTICS EXPRESS , 2021 , 29 (8) , 12093-12109 .
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Accurate and dynamic 3D shape measurement with digital image correlation-assisted phase shifting EI SCIE
期刊论文 | 2021 , 32 (7) | MEASUREMENT SCIENCE AND TECHNOLOGY
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Abstract :

Phase-shifting profilometry (PSP) has been widely used in structured-light (SL) systems for three-dimensional (3D) shape measurements, but the speed of the PSP technique is limited by increased phase-shifting patterns. This paper proposes an accurate and dynamic 3D shape measurement method by projecting only four patterns, including three-step phase-shifting patterns and one speckle pattern. Three-step phase-shifting images are used to obtain the initial unwrapped phase map with phase ambiguity. Based on the principle of digital image correlation and multi-view geometry, the absolute phase can be recovered reliably without requiring any embedded features or pre-defined information of the object. To improve the measurement accuracy, the projector coordinate is used as the measuring coordinate to establish a novel stereo SL system model. By solving a least square solution using the triple-view information, accurate 3D surface data can be reconstructed. The experimental results indicate that the proposed method can perform high-speed and accurate 3D shape measurements with an accuracy of 10.64 mu m, which is superior to conventional methods and has certain instructive significance for 3D profilometry and measurement engineering.

Keyword :

3D shape measurement structured-light phase shifting profilometry stereo vision digital image correlation

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GB/T 7714 Hu, Pengyu , Yang, Shuming , Zheng, Fenghe et al. Accurate and dynamic 3D shape measurement with digital image correlation-assisted phase shifting [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2021 , 32 (7) .
MLA Hu, Pengyu et al. "Accurate and dynamic 3D shape measurement with digital image correlation-assisted phase shifting" . | MEASUREMENT SCIENCE AND TECHNOLOGY 32 . 7 (2021) .
APA Hu, Pengyu , Yang, Shuming , Zheng, Fenghe , Yuan, Ye , Wang, Teng , Li, Shusheng et al. Accurate and dynamic 3D shape measurement with digital image correlation-assisted phase shifting . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2021 , 32 (7) .
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Controlled growth of a single carbon nanotube on an AFM probe SCIE PubMed CSCD
期刊论文 | 2021 , 7 (1) | MICROSYSTEMS & NANOENGINEERING
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Carbon nanotubes (CNTs) can be used as atomic force microscopy (AFM) tips for high-resolution scanning due to their small diameter, high aspect ratio and outstanding wear resistance. However, previous approaches for fabricating CNT probes are complex and poorly controlled. In this paper, we introduce a simple method to selectively fabricate a single CNT on an AFM tip by controlling the trigger threshold to adjust the amount of growth solution attached to the tip. The yield rate is over 93%. The resulting CNT probes are suitable in length, without the need for a subsequent cutting process. We used the CNT probe to scan the complex nanostructure with a high aspect ratio, thereby solving the long-lasting problem of mapping complex nanostructures.

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GB/T 7714 Cheng, Biyao , Yang, Shuming , Li, Wei et al. Controlled growth of a single carbon nanotube on an AFM probe [J]. | MICROSYSTEMS & NANOENGINEERING , 2021 , 7 (1) .
MLA Cheng, Biyao et al. "Controlled growth of a single carbon nanotube on an AFM probe" . | MICROSYSTEMS & NANOENGINEERING 7 . 1 (2021) .
APA Cheng, Biyao , Yang, Shuming , Li, Wei , Li, Shi , Shafique, Shareen , Wu, Dong et al. Controlled growth of a single carbon nanotube on an AFM probe . | MICROSYSTEMS & NANOENGINEERING , 2021 , 7 (1) .
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High-speed and accurate 3D shape measurement using DIC-assisted phase matching and triple-scanning EI SCIE
期刊论文 | 2021 , 147 | OPTICS AND LASERS IN ENGINEERING
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Structured-light (SL) three-dimensional (3D) shape measurements technique has been extensively studied and applied in various fields, but the real-time capability of SL system is limited by the number of projected SL patterns. This paper presents a digital image correlation (DIC) assisted phase matching and triple-scanning method for high-speed and accurate 3D shape measurements based on the combined projection of three-step phase-shifting patterns and one speckle pattern. Benefiting from the triple-view geometric constraints and DIC technique, stereo correspondence and absolute fringe order of each valid pixel in the left wrapped phase map can be explored without requiring spatial phase unwrapping process or any priori information, the initial disparity map and absolute phase map can be generated. Subsequently, an efficient disparity refinement scheme based on connectivity area segmentation and neighbor disparity check is applied to the initial disparity map and absolute phase map to compensate the pixels with wrong disparities. Several efficient strategies are developed in the pipeline of data processing to speed up the algorithm. To improve the measurement accuracy, stereo SL model is proposed to make adequate use of triple-view information to calculate 3D coordinates using the disparity map and absolute phase map, and the measurement error has been reduced by 33% compared with the conventional methods. The experimental results demonstrate that the proposed method can perform high-speed and accurate 3D shape measurements for arbitrary surfaces and dynamic scenes.

Keyword :

Structured-light 3D shape measurement Digital image correlation High-speed Triple-scanning

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GB/T 7714 Hu, Pengyu , Yang, Shuming , Zhang, Guofeng et al. High-speed and accurate 3D shape measurement using DIC-assisted phase matching and triple-scanning [J]. | OPTICS AND LASERS IN ENGINEERING , 2021 , 147 .
MLA Hu, Pengyu et al. "High-speed and accurate 3D shape measurement using DIC-assisted phase matching and triple-scanning" . | OPTICS AND LASERS IN ENGINEERING 147 (2021) .
APA Hu, Pengyu , Yang, Shuming , Zhang, Guofeng , Deng, Huiwen . High-speed and accurate 3D shape measurement using DIC-assisted phase matching and triple-scanning . | OPTICS AND LASERS IN ENGINEERING , 2021 , 147 .
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Multi-scale numerical analysis and experimental verification for nano-cutting EI SCIE
期刊论文 | 2021 , 71 , 260-268 | JOURNAL OF MANUFACTURING PROCESSES
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Abstract :

The development of numerical models applicable to ultra-precision machining presents serious challenges. Molecular dynamics methods can effectively capture nano-cutting operations at the micro-nanoscale but fail to accurately capture the realistically large-scale deformations involved in material removal, while it can be addressed by finite element methods but lacks the precision required for modeling nanoscale behaviors. The present study addresses this issue by developing a multi-scale numerical modeling method, the optimized Quasicontinuum (QC) method. Compared with the original QC method, the optimized QC method adds the material removal function, avoids unreasonable lattice excessive distortion and large-area, deep dislocation slip. The optimized QC method can more truly simulate the large deformation and material removal phenomenon of cutting, and greatly improve the calculation speed. The influence of cutting parameters such as cutting depth, tool rake angle and rounded tool cutting edge radius on cutting force is studied. The change of cutting depth has the most significant influence on cutting force, while the influence of tool rake angle and rounded tool cutting edge radius are relatively small. Therefore, the effect of cutting depth on cutting force is studied through the experiment of single crystal copper nano-cutting to verify the effectiveness of multi-scale method. The experimental results show that it is proportional to the simulation results.

Keyword :

Ultra-precision Multi-level modeling Nano-cutting Optimization

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GB/T 7714 Yang, Shuming , Cheng, Biyao , McGeough, Joseph A. et al. Multi-scale numerical analysis and experimental verification for nano-cutting [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2021 , 71 : 260-268 .
MLA Yang, Shuming et al. "Multi-scale numerical analysis and experimental verification for nano-cutting" . | JOURNAL OF MANUFACTURING PROCESSES 71 (2021) : 260-268 .
APA Yang, Shuming , Cheng, Biyao , McGeough, Joseph A. , Woldu, Yonas Tesfaye , Yang, Xiaokai . Multi-scale numerical analysis and experimental verification for nano-cutting . | JOURNAL OF MANUFACTURING PROCESSES , 2021 , 71 , 260-268 .
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Fiber optic white light interferometer for areal surface measurement EI SCIE Scopus
期刊论文 | 2020 , 31 (2) | MEASUREMENT SCIENCE AND TECHNOLOGY | IF: 2.046
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

White light interferometers (WLI) are extremely powerful tools in the context of areal surface topography instrumentation. With lateral scanning mechanisms, larger objects with trans-scale structures are also measurable. However, the existing commercial WLIs are usually only applicable for off-line measurements in the laboratory. This paper presents a flexible WLI, in which the light source and the vertical scanning mechanism are separated from the interference probe using fiber-optic components. As a result, the interference probe is more compact, and portable for on-machine measurement. Meanwhile, a comprehensive algorithm that combines the improved gravity center method and phase-shifting technique is proposed for signal processing, which can balance computation time and noise robustness. The simulation results show the effectiveness by comparing with the traditional white light scanning interferometry methods. A 1000?nm step height standard was used as a test specimen to evaluate the proposed system and algorithm. The experimental data show that the measurement results are basically in good agreement with the calibrated value.

Keyword :

flexible probe fiber optics white light interferometry

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GB/T 7714 Zhang, Guofeng , Yang, Shuming , Fluegge, Jens et al. Fiber optic white light interferometer for areal surface measurement [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2020 , 31 (2) .
MLA Zhang, Guofeng et al. "Fiber optic white light interferometer for areal surface measurement" . | MEASUREMENT SCIENCE AND TECHNOLOGY 31 . 2 (2020) .
APA Zhang, Guofeng , Yang, Shuming , Fluegge, Jens , Bosse, Harald . Fiber optic white light interferometer for areal surface measurement . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2020 , 31 (2) .
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Nanofocusing of a novel plasmonic fiber tip coupling with nanograting resonance EI SCIE
期刊论文 | 2020 , 53 (21) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
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The nanofocusing of plasmonic tips which can realize localized electric field enhancement beyond the diffraction limit is highly desired for light-matter interaction and super-resolution imaging research. A novel plasmonic fiber tip made of a metal-coated fiber tip coupling with nanograting resonance is theoretically and numerically presented using the finite difference time domain method. The nanofocusing of metal-coated fiber tip is investigated under the internal excitation of the radial vector beam and the evolution of internal optical radial vector mode to surface plasmon polaritons (SPPs) mode is calculated under the excitation wavelength of 632.8 nm. The circular nanogratings are designed on the metallic sidewalls of the plasmonic fiber tip, and the resonance enhancement mechanism is studied with the interference of different propagation modes. It is found that the positions of the circular slits are determined by the interference of SPP modes and the interference of internal optical mode and external SPP mode. The nanogratings are nonperiodic, and with the decrease of the effective refractive index of the optical mode, the pitch length between two slits gets bigger. The results show that the novel plasmonic fiber tip coupling with nanograting resonance can achieve one order of magnitude higher in light intensity compared with the existing plasmonic tips without compromise on spatial resolution and signal-to-noise ratio.

Keyword :

plasmonic fiber tip electric field enhancement nanofocusing surface plasmon polaritons

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GB/T 7714 Li, Shaobo , Yang, Shuming . Nanofocusing of a novel plasmonic fiber tip coupling with nanograting resonance [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (21) .
MLA Li, Shaobo et al. "Nanofocusing of a novel plasmonic fiber tip coupling with nanograting resonance" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 21 (2020) .
APA Li, Shaobo , Yang, Shuming . Nanofocusing of a novel plasmonic fiber tip coupling with nanograting resonance . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (21) .
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