Search results for: Shian Zhang

Items from 1 to 20 out of 25 results

article

Predictors of anti‐VEGF efficacy in chronic central serous chorioretinopathy based on intraocular cytokine levels and pigment epithelium detachment subtypes

Jianbo Mao, Caiyun Zhang, Shian Zhang, Chenyi Liu, more

Acta Ophthalmologica > 100 > 7 > e1385 - e1394

Purpose The aim of this study was to compare intraocular cytokines among different types of pigment epithelial detachments (PEDs) in patients with chronic central serous chorioretinopathy (CSC) and to investigate the association of cytokine levels and PED types with response to anti‐vascular endothelial growth factor (VEGF) therapy. Methods We included 88 patients with chronic CSC and 30 controls...

article

Prediction of anti‐VEGF efficacy in diabetic macular oedema using intraocular cytokines and macular optical coherence tomography

Jianbo Mao, Shian Zhang, Zicheng Zheng, Xinyi Deng, more

Acta Ophthalmologica > 100 > 4 > e891 - e898

Purpose In eyes with diabetic macular oedema (DME), aqueous humour (AH) cytokine levels before and after anti‐vascular endothelial growth factor (VEGF) treatment were compared and correlated with optical coherence tomography structural parameters. Methods This prospective study included 56 control patients with cataracts and 83 patients with DME manifesting as diffuse retinal thickening (DRT),...

article

Selective excitation of one among the three peaks of tip‐enhanced Raman spectroscopy by a shaped ultrafast laser pulse

Yingjie Xia, Hua Zhao, Shian Zhang, Donghai Feng, more

Journal of Raman Spectroscopy > 51 > 3 > 461 - 475

There are generally several neighboring Raman peaks that are excited simultaneously in tip‐enhanced Raman spectroscopy (TERS). A method to selectively excite a specific Raman peak and simultaneously depress the others is required for suppressing noise and improving detection sensitivity and accuracy. In this study, we demonstrate a scheme for selective excitation of one Raman peak among three excited...

article

Selective Excitation on Tip-Enhanced Raman Spectroscopy by Pulse Shaping Femtosecond Laser

Yingjie Xia, Hua Zhao, Chunjie Zheng, Shian Zhang, more

Plasmonics > 2019 > 14 > 2 > 523-531

In this paper, we propose a scheme for achieving ultrafast coherent control of the selective excitation among three excited states in stimulated Raman scattering process on a tip-enhanced Raman spectroscopy (TERS). The center frequencies of the pump and Stokes laser pulses are 14,000 cm⁻¹ and 12,500 cm⁻¹, and their spectral bandwidths are both 700 cm⁻¹. By properly modulating the spectral phase distribution...

article

Corrosion Performance of Carbon Steel in CO₂ Aqueous Environment Containing Silty Sand with Different Sizes

Songle Lu, Wei Liu, Shian Zhang, Xiaolong Qi, more

Acta Metallurgica Sinica (English Letters) > 2017 > 30 > 11 > 1055-1066

Corrosion performance of carbon steel in CO₂ aqueous environment containing silty sand with different sizes was investigated by immersion tests and electrochemical measurements. Silty sand could form an adsorption layer on steel surface in initial period, and the sand adsorption layer was turned into a mixture film of silty sand with corrosion product in last period. The adsorption layer in 325 mesh...

article

A Solution‐Processed Ultrafast Optical Switch Based on a Nanostructured Epsilon‐Near‐Zero Medium

Qiangbing Guo, Yudong Cui, Yunhua Yao, Yuting Ye, more

Advanced Materials > 29 > 27 > n/a - n/a

All the optical properties of materials are derived from dielectric function. In spectral region where the dielectric permittivity approaches zero, known as epsilon‐near‐zero (ENZ) region, the propagating light within the material attains a very high phase velocity, and meanwhile the material exhibits strong optical nonlinearity. The interplay between the linear and nonlinear optical response in these...

article

Fano Resonance of Nanocrescent for the Detection of Single Molecules and Single Nanoparticles

Chunjie Zheng, Tianqing Jia, Hua Zhao, Yingjie Xia, more

Plasmonics > 2018 > 13 > 4 > 1121-1127

This paper reports a theoretical study on the Fano resonance of a 3D nanocrescent and its application in single molecular detection. The resonance wavelength changes with the crescent radius, gap width and thickness. The Fano resonance is attributed to the interference between the quadrupolar mode supported by the horizontal crescent and the quadrupolar mode supported by the nanotip oscillating along...

article

Dissociative photoionization of 1,2-dichloroethane in intense near-infrared femtosecond laser field

Jian Zhang, Yan Yang, Zhipeng Li, Shian Zhang, more

Chemical Physics Letters > 2017 > 667 > C > 238-243

We experimentally demonstrate the dissociative photoionization of 1,2-C₂H₄Cl₂ molecules in femtosecond laser field by time-of-flight mass spectrum and dc-slice imaging technology. Our results show the low kinetic energy components are from the dissociative ionization process of singly charged molecular ions, and the positive charge assignment are greatly influenced by the appearance energy of the...

article

Theoretical study of excited states of DNA base dimers and tetramers using optimally tuned range‐separated density functional theory

Haitao Sun, Shian Zhang, Cheng Zhong, Zhenrong Sun

Journal of Computational Chemistry > 37 > 7 > 684 - 693

Excited states of various DNA base dimers and tetramers including Watson‐Crick H‐bonding and stacking interactions have been investigated by time‐dependent density functional theory using nonempirically tuned range‐separated exchange (RSE) functionals. Significant improvements are found in the prediction of excitation energies and oscillator strengths, with results comparable to those of high‐level...

article

Improving upconversion luminescence efficiency in Er³⁺-doped NaYF₄ nanocrystals by two-color laser field

Yunhua Yao, Cheng Xu, Ye Zheng, Chengshuai Yang, more

Journal of Materials Science > 2016 > 51 > 11 > 5460-5468

Improving upconversion luminescence efficiency of lanthanide-doped nanocrystals is always a hot topic for scientists because of its very important application in photonics, photovoltaics, biological imaging, security printing, and therapeutics. Two-color laser field has shown to be a well-established strategy to further improve the upconversion luminescence efficiency. Here, we first propose a two-color...

article

Enhancing field-free molecular alignment by a polynomial phase modulation

Yunxia Huang, Shuwu Xu, Yunhua Yao, Tianqing Jia, more

The European Physical Journal D > 2016 > 70 > 1 > 1-5

A feasible scheme is proposed to enhance the molecular alignment by shaping the femtosecond laser pulse with a polynomial phase modulation that involves the second and third order dispersions. It is shown that the field-free molecular alignment can be obtained adiabatically during the interaction with the shaped femtosecond laser pulse, and can be reproduced at full rotational periods with the same...

article

Concerted elimination of Br2+ resulting from the Coulomb explosion of 1,2-dibromoethane in an intense femtosecond laser field

Hua Wu, Yan Yang, Shengzhi Sun, Jian Zhang, more

Chemical Physics Letters > 2014 > 607 > C > 70-74

Concerted elimination pathway leading to Br₂⁺ and C₂H₄⁺ from 1,2-dibromoethane molecule has been investigated in 800nm femtosecond laser field by dc-slice imaging technology. The kinetic energy release and angular distributions of Br₂⁺ and C₂H₄⁺ demonstrate that Br₂⁺ results from the two-body Coulomb explosion of the doubly charged parent ion. Ab initio calculations show that the doubly charged precursor...

article

Manipulation of terahertz pulse generation in ZnTe crystal by shaping femtosecond laser pulses with a square phase modulation

Chenhui Lu, Shian Zhang, Tianqing Jia, Jianrong Qiu, more

Optics Communications > 2014 > 310 > Complete > 90-93

We theoretically demonstrate that the terahertz pulse generation via optical rectification in ZnTe crystal can be effectively controlled by making use of the shaped femtosecond laser pulses with a square phase modulation. We show that, by precisely controlling these parameters characterizing the square phase modulation, the terahertz spectrum is periodically modulated and the terahertz pulses are...

article

Manipulation of cross-linked micro/nanopatterns on ZnO by adjusting the femtosecond-laser polarizations of four-beam interference

Xin Jia, Tianqing Jia, Shian Zhang, Zhenrong Sun, more

Applied Physics A > 2014 > 114 > 4 > 1333-1338

We report the fabrication of cross-linked micro/nanopatterns on ZnO by adjusting the femtosecond-laser polarizations of four-beam interference. The micro/nanopatterns are composed of two types of patterns with vertically oriented and horizontally oriented ripples, respectively. The relative locations, ablation depths and the nanoripple distributions of the two patterns can be manipulated by adjusting...

article

Infrared femtosecond laser-induced great enhancement of ultraviolet luminescence of ZnO two-dimensional nanostructures

Jia Pan, Tianqing Jia, Xin Jia, Donghai Feng, more

Applied Physics A > 2014 > 117 > 4 > 1923-1932

Two-dimensional (2D) complex nanostructures on the surface of ZnO crystal are fabricated by the interference of three 800 nm fs laser beams. The 2D nanostructures exhibit a great enhancement of UV emission excited by infrared fs laser with central wavelengths ranging from 1,200 nm to 2,000 nm. We propose that the defect states in the band gap of 2D nanostructures induced by 800 nm fs laser ablation...

article

Ejection of triatomic molecular ion H3+ from methyl chloride in an intense femtosecond laser field

Shengzhi Sun, Yan Yang, Jian Zhang, Hua Wu, more

Chemical Physics Letters > 2013 > 581 > Complete > 16-20

Ejection of H3+ and ³⁵ Cl ⁺ from CH ₃ Cl molecule is investigated and the Coulomb explosion channels are confirmed by their kinetic energy release and angular distributions. The fragment anisotropy of H3+ ejection can be attributed to the dynamic alignment of CH ₃ ³⁵ Cl ²⁺ induced by femtosecond laser field, the non-zero H3+ ejection angle with respect to...

article

Fabrication of complex nanostructures on ZnO crystals by the interference of three femtosecond laser beams

Kan Zhou, Pingxin Xiong, Xin Jia, Shian Zhang, more

Optics and Lasers in Engineering > 2012 > 50 > 2 > 297-302

By adjusting the laser polarization combinations, fluences and pulse numbers, we fabricated several types of two-dimensional (2D) complex nanostructures on the surface of c-cut ZnO single crystal by the interference of three femtosecond laser beams with central wavelength of 800nm, pulse duration of 50fs and pulse repetition frequency of 1kHz. The hexagonal 2D nanostructures with a period of 600nm...

article

Generation and amplification of dual-color femtosecond pulses by a noncollinear optical parametric up-conversion process

Jinyu Sun, Shian Zhang, Tianqing Jia, Zugeng Wang, more

Optics Communications > 2011 > 284 > 19 > 4745-4748

Noncollinear optical parametric up-conversion generation and amplification are realized in a thick β-barium borate (BBO) crystal, and a couple of visible femtosecond up-conversion laser pulses can be achieved by a femtosecond pulse at 800nm as the pump sources. The theoretical and experimental results indicate that there exist phase-matching conditions for dual-color noncollinear parametric up-conversion...

article

Single-photon fluorescence enhancement in IR144 by phase-modulated femtosecond pulses

Hui Zhang, Shian Zhang, Chenhui Lu, Tianqing Jia, more

Chemical Physics Letters > 2011 > 503 > 1-3 > 176-179

In this Letter, we experimentally show that the single-photon fluorescence in IR144 solution can be enhanced by manipulating the laser spectral phase. We theoretically and experimentally validate that the single-photon fluorescence enhancement should be attributed to the non-resonant two-photon absorption from the state S ₁ →S ₂ . Finally, our proposed mechanism is further confirmed...

article

A hierarchical key management scheme for secure group communications in mobile ad hoc networks

Nen-Chung Wang, Shian-Zhang Fang

The Journal of Systems & Software > 2007 > 80 > 10 > 1667-1677

A mobile ad hoc network (MANET) is a kind of wireless communication infrastructure that does not have base stations or routers. Each node acts as a router and is responsible for dynamically discovering other nodes it can directly communicate with. However, when a message without encryption is sent out through a general tunnel, it may be maliciously attacked. In this paper, we propose a hierarchical...

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INFONA - science communication portal

Search results for: Shian Zhang

Predictors of anti‐VEGF efficacy in chronic central serous chorioretinopathy based on intraocular cytokine levels and pigment epithelium detachment subtypes

Prediction of anti‐VEGF efficacy in diabetic macular oedema using intraocular cytokines and macular optical coherence tomography

Selective excitation of one among the three peaks of tip‐enhanced Raman spectroscopy by a shaped ultrafast laser pulse

Selective Excitation on Tip-Enhanced Raman Spectroscopy by Pulse Shaping Femtosecond Laser

Corrosion Performance of Carbon Steel in CO₂ Aqueous Environment Containing Silty Sand with Different Sizes

A Solution‐Processed Ultrafast Optical Switch Based on a Nanostructured Epsilon‐Near‐Zero Medium

Fano Resonance of Nanocrescent for the Detection of Single Molecules and Single Nanoparticles

Dissociative photoionization of 1,2-dichloroethane in intense near-infrared femtosecond laser field

Theoretical study of excited states of DNA base dimers and tetramers using optimally tuned range‐separated density functional theory

Improving upconversion luminescence efficiency in Er³⁺-doped NaYF₄ nanocrystals by two-color laser field

Enhancing field-free molecular alignment by a polynomial phase modulation

Concerted elimination of Br2+ resulting from the Coulomb explosion of 1,2-dibromoethane in an intense femtosecond laser field

Manipulation of terahertz pulse generation in ZnTe crystal by shaping femtosecond laser pulses with a square phase modulation

Manipulation of cross-linked micro/nanopatterns on ZnO by adjusting the femtosecond-laser polarizations of four-beam interference

Infrared femtosecond laser-induced great enhancement of ultraviolet luminescence of ZnO two-dimensional nanostructures

Ejection of triatomic molecular ion H3+ from methyl chloride in an intense femtosecond laser field

Fabrication of complex nanostructures on ZnO crystals by the interference of three femtosecond laser beams

Generation and amplification of dual-color femtosecond pulses by a noncollinear optical parametric up-conversion process

Single-photon fluorescence enhancement in IR144 by phase-modulated femtosecond pulses

A hierarchical key management scheme for secure group communications in mobile ad hoc networks

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