2019
2019
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Record 409 of
Title:X-ray transmittance characteristics and potential communication in re-enter plasma sheath
Author(s):Li, Yao(1,2); Su, Tong(2); Sheng, Lizhi(2); Qiang, Pengfei(2); Xu, Neng(2); Zhao, Baosheng(2)Source: Optik Volume: 197 Issue: DOI: 10.1016/j.ijleo.2019.06.017 Published: November 2019Abstract:X-ray communication has a broad application prospect since it was introduced by NASA in 2007. Combination with modern digital X-ray source, X-ray communication shows a promising prospect in the further spatial communication, especially on harsh condition. In this paper, to begin with, transmission co-efficiency of X-ray signal penetrate in plasma sheath were analysised theoretically and experimentally. Simulation results indicate that X-ray signal was not influenced by the re-enter plasma sheath. Then a glow discharge plasma source was used to analysis the transmission characteristics. When the plasma electron density ranges from 6 × 1016/m3 to 1.2 × 1016/m3, the thickness of plasma medium is 18 cm, transmission co-efficiency of X-ray signal increases with the rise of photon energy and flux. For example, a 2.4Mcps X-ray flux with 20 kV anode voltage can achieve more than 95% transmission co-efficiency. Finally, a Monte Carlo simulation was used to analysis the feasibility of X-ray communication in re-enter condition, which indicates 1.3Mbps transmitting speed could be achieved in the re-enter condition theoretically. These results pointed out that X-ray communication can mitigate the effects of plasma sheath and open a novel way to solve this problem. ? 2019 Elsevier GmbHAccession Number: 20193407337377 -
Record 410 of
Title:High birefringence, low loss, and flattened dispersion photonic crystal fiber for terahertz application
Author(s):Wang, Dou-Dou(1); Mu, Chang-Long(1); Kong, De-Peng(2); Guo, Chen-Yu(1)Source: Chinese Physics B Volume: 28 Issue: 11 DOI: 10.1088/1674-1056/ab44af Published: 2019Abstract:A type of photonic crystal fiber based on Kagome lattice cladding and slot air holes in a rectangular core is investigated. Full vector finite element method is used to evaluate the modal and propagation properties of the designed fiber. High birefringence of 0.089 and low effective material loss of 0.055 cm-1 are obtained at 1 THz. The y-polarized fundamental mode of the designed fiber shows a flattened and near-zero dispersion of 0 0.45 ps ? THz-1 ? cm-1 within a broad frequency range (0.5 THz-1.5 THz). Our results provide the theory basis for applications of the designed fiber in terahertz polarization maintaining systems. ? 2019 Chinese Physical Society and IOP Publishing Ltd.Accession Number: 20200808185983 -
Record 411 of
Title:Compressed Blind Deconvolution and Denoising for Complementary Beam Subtraction Light-Sheet Fluorescence Microscopy
Author(s):Bai, Chen(1); Liu, Chao(1); Jia, Hao(1); Peng, Tong(1); Min, Junwei(1); Lei, Ming(1); Yu, Xianghua(1); Yao, Baoli(1)Source: IEEE Transactions on Biomedical Engineering Volume: 66 Issue: 10 DOI: 10.1109/TBME.2019.2899583 Published: October 2019Abstract:The side-lobes of a Bessel beam (BB) create a severe out-of-focus background in scanning light-sheet fluorescence microscopy, thereby extremely limiting the axial resolution. The complementary beam subtraction (CBS) method can significantly reduce the out-of-focus background by double scanning a BB and its complementary beam. However, the blurring and noise caused by the system instability during the double scanning and subtraction operations degrade the image quality significantly. Therefore, we propose a compressed blind deconvolution and denoising (CBDD) method that solves this problem. Methods: We use a unified formulation that comprehensively takes advantage of multiple compressed sensing reconstructions and blind sparse representation. Results: The simulations and experiments were performed using the microbeads and model organisms to verify the effectiveness of the proposed method. Compared with the CBS light-sheet method, the proposed CBDD algorithm achieved the gain improvement in the axial and lateral resolution of about 1.81 and 2.22 times, respectively, while the average signal-to-noise ratio (SNR) was increased by about 3 dB. Conclusion: Accordingly, the proposed method can suppress the noise level, enhance the SNR, and recover the degraded resolution simultaneously. Significance: The obtained results demonstrate the proposed CBDD algorithm is well suited to improve the imaging performance of the CBS light-sheet fluorescence microscopy. ? 1964-2012 IEEE.Accession Number: 20200207984400 -
Record 412 of
Title:Nonlinear multimodal interference for ytterbium-doped all-fiber mode-locking noise-like pulse generation
Author(s):Lv, Zhiguo(1); Yang, Zhi(1); Song, Dongdong(1); Li, Feng(1); Yang, Xiaojun(1); Yang, Yang(1); Wang, Yishan(1); Li, Qianglong(1); Zhao, Wei(1)Source: Applied Physics Express Volume: 12 Issue: 2 DOI: 10.7567/1882-0786/aaf417 Published: February 2019Abstract:This work demonstrates the generation of the noise-like pulse (NLP) in an all-normal-dispersion passively mode-locked ytterbium-doped ring laser cavity with nonlinear multimodal interference as an equivalent all-fiber saturable absorber, for the first time to the best of our knowledge. Depending on the appropriate optimization of the intra-cavity birefringence and reasonable control of the curving curvature of the multimode fiber, self-started NLP operation can be built and maintained within a wide pump range. Additionally, the effect of the multimode fiber length on the NLP mode-locking performance and the generation of the high power NLP have also been experimentally studied. ? 2019 The Japan Society of Applied Physics.Accession Number: 20191006590140 -
Record 413 of
Title:Secondary electron emission characteristics of Al2O3 coatings prepared by atomic layer deposition
Author(s):Guo, Junjiang(1,2,3); Wang, Dan(4); Xu, Yantao(1,3); Zhu, Xiangping(1,3); Wen, Kaile(3,5); Miao, Guanghui(6); Cao, Weiwei(1,3); Si, JinHai(2); Lu, Min(1); Guo, Haitao(1)Source: AIP Advances Volume: 9 Issue: 9 DOI: 10.1063/1.5113671 Published: September 1, 2019Abstract:Secondary electron emission (SEE) plays a crucial role in the gain performance of devices, such as electron multipliers and microchannel plates (MCPs). Gain performance could be improved by increasing the secondary electron yield (SEY) of device surface. Al2O3 coating is an ideal material for SEE, benefiting from its high SEY. The Al2O3 coating deposited on inner device walls by atomic layer deposition (ALD) can improve the gain performance of devices. In this study, the SEE characteristics of Al2O3 coatings were investigated experimentally. A series of Al2O3 coatings with thicknesses of 1-30 nm were prepared on Si substrate through the ALD method. Then, the SEY of the coatings were quantified as a function of primary electron energy in the range of 100～1500 eV. Furthermore, an equation describing the true SEY as a function of thickness was established by applying theory of Dionne's SEE model. This work presents potential approach for controlling the SEE level of Al2O3 coatings through thickness adjustment and is crucial for comprehending the SEE of composite materials. ? 2019 Author(s).Accession Number: 20193807440396 -
Record 414 of
Title:Simultaneous optical trapping and imaging in axial plane
Author(s):Lei, Ming(1,2); Liang, Yansheng(1,2)Source: Optics InfoBase Conference Papers Volume: Part F168-BODA 2019 Issue: DOI: 10.1364/BODA.2019.JW3A.1 Published: 2019Abstract:We developed an axial-plane Gerchberg-Saxton iterative algorithm to generate the customizable curved beams in the axial plane. We also developed an optical trapping setup and demonstrated simultaneous trapping and imaging in axial plane. ? 2019 OSA - The Optical Society. All rights reserved.Accession Number: 20203609138678 -
Record 415 of
Title:Separation of optical angular momentum flux
Author(s):Yan, Shaohui(1); Li, Manman(1); Yao, Baoli(1)Source: Journal of Optics (United Kingdom) Volume: 21 Issue: 3 DOI: 10.1088/2040-8986/ab02d5 Published: February 18, 2019Abstract:We present an approach to separating the angular momentum (AM) flux of monochromatic light into its spin and orbital parts based on a symmetrized AM tensor {M}. When considering the AM flux for a light beam through its cross section and that for an outgoing wave through a spherical surface in the far-field zone, the separation gives the desired results: the spin/orbital AM flux equals the integral of spin/orbital AM density times some weighting factor accounting for energy flux.When applied to Bessel beams, the obtained spin and orbital AM fluxes are exactly the same as those given by the paper (2014 New J. Phys. 16 093037) based on the canonical AM tensor separation. Furthermore, from the spin AM flux integral, the divergence-free spin AM tensor {S} can be identified. We define the orbital AM tensor to be the difference between the total AM tensor {M} and {S} Since {M} is divergence-free, the integral for either spin and orbital AM flux, can be made on any closed surface. ? 2019 IOP Publishing Ltd.Accession Number: 20191506772872 -
Record 416 of
Title:Observation of dissipative soliton bound states in a nonlinear multimodal interference based all-fiber all-normal-dispersion mode-locking laser
Author(s):Lv, Zhiguo(1); Yang, Zhi(1); Song, DongDong(1); Li, Feng(1); Yang, Yang(1); Yang, Xiaojun(1); Wang, Yishan(1); Li, Qianglong(1); Zhao, Wei(1)Source: Optics and Laser Technology Volume: 119 Issue: DOI: 10.1016/j.optlastec.2019.105626 Published: November 2019Abstract:This work, for the first time, demonstrates the generation of the bound soliton states in a nonlinear multimodal interference (NL-MMI) based ytterbium-doped all-normal-dispersion dissipative soliton mode-locking laser. Further, up to the third harmonic mode-locked bound soliton states with rotating phase difference can be generated under the appropriate optimization of the laser cavity parameters. Furthermore, the evolution dynamics and compressibility of the harmonic mode-locked bound soliton states have also been respectively investigated in order to reveal the temporal distribution characteristics of the highly chirped bound soliton states and inter-pulse separation after dispersion compensation. ? 2019 Elsevier LtdAccession Number: 20192507075788 -
Record 417 of
Title:Microtapered long period gratings: Non-destructive fabrication, highly sensitive torsion sensing, and tunable broadband filtering
Author(s):Liu, Jihong(1); Cheng, Minhui(1); Kong, Xudong(2); Han, Dongdong(1); Dong, Jun(1); Luo, Wenfeng(1); Ren, K.(1)Source: Infrared Physics and Technology Volume: 102 Issue: DOI: 10.1016/j.infrared.2019.103000 Published: November 2019Abstract:A promising technology for non-destructive fabricating microtapered long period fiber gratings (MT-LPFGs) is demonstrated by periodically slight tapering single-mode fiber. Owing to the optimized microtapering technique, high-quality LPFGs with dip attenuations of about 40 dB, insertion loss ? 2019 Elsevier B.V.Accession Number: 20193207280819 -
Record 418 of
Title:High-throughput and fast-speed Fourier ptychographic microscopy: A review
Author(s):Pan, An(1,2); Yao, Baoli(1,3)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 48 Issue: 6 DOI: 10.3788/IRLA201948.0603012 Published: June 25, 2019Abstract:Fourier ptychographic microscopy (FPM) is a promising label-free computational imaging technique with high resolution, wide field-of-view (FOV) and quantitative phase recovery. Due to its flexible setup, promising high-contrast performance without mechanical scanning and interferometric measurements, FPM has wide applications in the digital pathology, observation and dynamic imaging of label-free cells in vitro. In this review, the principle, research status and the latest advances were introduced in several aspects of FPM such as the system calibration methods, high-throughput imaging and high-speed imaging. The current problems and future trends were also presented. ? 2019, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.Accession Number: 20193407357498 -
Record 419 of
Title:White-Light Image Reconstruction via Seeded Modulation Instability
Author(s):Zhang, Yongbin(1,2); Liu, Hongjun(1,3); Huang, Nan(1); Wang, Zhaolu(1)Source: Physical Review Applied Volume: 12 Issue: 5 DOI: 10.1103/PhysRevApplied.12.054005 Published: November 4, 2019Abstract:Nonlinear imaging preserves more detailed information by exploiting the presence and interaction of many photons in nonlinear optics. Despite significant progress, nonlinear methods for white-light image recovery are still lacking. We report the white-light image reconstruction via seeded modulation instability, which is called dynamical stochastic resonance. The underlying signals are illuminated with white light emitted from a light-emitting diode and are reinforced by coupling with scattering noise in a noninstantaneous self-focusing medium. Our experimental results show that this nonlinear approach is effective in improving the contrast and visibility of completely blurred white-light images by guiding noise rather than by filtering noise. The signals of the entire temporal spectrum collectively seed a potential in the medium. In turn, the potential leads to the enhancement of signal modes by concentrating scattering noise. A theoretical growth rate is derived and the numerical simulations are presented to match the experimental observation. We also demonstrate that the underlying signals can be preferably reproduced by asynchronously probing the seeded potential with another white-light beam. Our work reveals an alternative scheme for white-light image detection. ? 2019 American Physical Society.Accession Number: 20194707717387 -
Record 420 of
Title:High-performance mid-infrared frequency upconversion in lithium niobate waveguide patterned with metasurfaces
Author(s):Chi, Jiao(1,3); Liu, Hongjun(1,2); Huang, Nan(1); Wang, Zhaolu(1)Source: Journal of Physics D: Applied Physics Volume: 52 Issue: 3 DOI: 10.1088/1361-6463/aaebe7 Published: January 16, 2019Abstract:Mid-infrared detectors which converter the detected mid-infrared light to the near infrared (NIR) or even visible are of significant interest in free-space communication. We demonstrate a high-performance frequency upconversion from 3.4 μm to 1.064 μm pumped by 1.55 μm in gradient metasurface-assisted thin-film lithium niobate waveguide. Based on this new structure of nonlinear waveguide, the phase-matching condition can be free in on-chip frequency conversion and the power of idler can be 24.5 times as high as that of no metasurface waveguide. The efficient upconversion is realized within a wide signal wavelength range from 3.25 μm to 3.50 μm. This study is helpful for obtaining the precise and integrated mid-infrared detectors. ? 2018 IOP Publishing Ltd.Accession Number: 20184706113727