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Zhu Zheng

Bio: Zhu Zheng is an academic researcher from Nanjing University. The author has contributed to research in topics: Polarization (waves) & Polarization rotator. The author has an hindex of 3, co-authored 4 publications receiving 218 citations.

Papers
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Journal ArticleDOI
Zhu Zheng1, Baifu Zhang1, Hao Chen1, Jianping Ding1, Hui-Tian Wang1 
TL;DR: Experiment on optical tweezers demonstrates that the focused Airy beams can create multiple traps for two-dimensional confining particles, and the stable traps exist in the vicinity of the main intensity lobes in the focused beams.
Abstract: Airy beams are attractive owing to their two intriguing properties—self-bending and nondiffraction—that are particularly helpful for optical manipulation of particles. We perform theoretical and experimental investigations into the focusing property of Airy beams and provide insight into the trapping ability of tightly focused Airy beams. Experiment on optical tweezers demonstrates that the focused Airy beams can create multiple traps for two-dimensional confining particles, and the stable traps exist in the vicinity of the main intensity lobes in the focused beams. The trapping pattern can be varied with changes in the cross section of the focused beam. The focused Airy beam offers a novel way of optically manipulating microparticles.

161 citations

Journal ArticleDOI
TL;DR: The zero-order unidirectional transmission is achieved in dual-metal grating structures composed of two gratings with different structures in the absence of anisotropy and nonlinearity based on the unique property and by modulating the structural parameters.
Abstract: We predict the unidirectional optical transmission in dual-metal grating structures composed of two gratings with different structures in the absence of anisotropy and nonlinearity. The zero-order unidirectional transmission is achieved. Based on the unique property and by modulating the structural parameters, the transmittance approaches to 0% and 60% in the two opposite directions, respectively.

60 citations

Journal ArticleDOI
Hao Chen1, Zhu Zheng1, Baifu Zhang1, Jianping Ding1, Hui-Tian Wang1 
TL;DR: This work proposes a method of polarization shaping in the focal region with the polarization modulation of incident light by using an iterative optimization based on a vectorial diffraction calculation with the help of the fast Fourier transform, which provides a novel way to control the vectorial feature of the focal volume with thehelp of polarization tailoring.
Abstract: We proposed a method of polarization shaping in the focal region with the polarization modulation of incident light. By using an iterative optimization based on a vectorial diffraction calculation with the help of the fast Fourier transform, we can tailor the polarization structure in the focal plane. This provides a novel way to control the vectorial feature of the focal volume with the help of polarization tailoring, which is different from the method using wavefront shaping. The capability of polarization-only modulation on the incident light is demonstrated by optical experiments.

28 citations

Journal ArticleDOI
TL;DR: In this paper, transmission properties in configurations composed of two single metal gratings with different thicknesses were studied and a simplified model was proposed to comprehend the underlying physics of this special phenomenon.
Abstract: We study transmission properties in configurations composed of two single metal gratings with different thicknesses. Choosing the perfect electric conductor excludes the influence of intrinsic material dispersion on transmission behaviors; and as such, we aim to reveal the contribution of geometric dispersion to electromagnetic transmission. Transmission suppression line, instead of a transmission suppression point, is discovered, denoting the curve of the wavelength versus the interval or the lateral displacement between the two single gratings when the transmission suppression appears. A simplified model is proposed to comprehend the underlying physics of this special phenomenon.

2 citations


Cited by
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Journal ArticleDOI
20 May 2019
TL;DR: A number of families of accelerating optical waves have been identified in the paraxial and non-paraxial domains in space and/or time, with different methods developed to control at will their trajectory, amplitude, and beam width as mentioned in this paper.
Abstract: Over the last dozen years, the area of accelerating waves has made considerable advances not only in terms of fundamentals and experimental demonstrations, but also in connection to a wide range of applications. Starting from the prototypical Airy beam that was proposed and observed in 2007, new families of accelerating waves have been identified in the paraxial and nonparaxial domains in space and/or time, with different methods developed to control at will their trajectory, amplitude, and beam width. Accelerating optical waves exhibit a number of highly desirable attributes. They move along a curved or accelerating trajectory while being resilient to perturbations (self-healing) and are diffraction-free. It is because of these particular features that accelerating waves have been utilized in a variety of applications in the areas of filamentation, beam focusing, particle manipulation, biomedical imaging, plasmons, and material processing, among others.

275 citations

Journal ArticleDOI
Hao Chen1, Jingjing Hao1, Baifu Zhang1, Ji Xu1, Jianping Ding1, Hui-Tian Wang1 
TL;DR: This work presents an idea to generate an arbitrary space-variant vector beam with structured polarization and phase distributions, synthesized from the left- and right-hand polarized light, each carrying different phase distributions.
Abstract: We present an idea to generate an arbitrary space-variant vector beam with structured polarization and phase distributions. The vector beams are synthesized from the left- and right-hand polarized light, each carrying different phase distributions. Both the phase and the state of polarization of vector beams can be tailored independently and dynamically by a spatial light modulator.

194 citations

Journal ArticleDOI
TL;DR: It is shown that high-contrast asymmetric transmission of visible light can be provided by a planar device of wavelength-scale thickness incorporating a pair of nonsymmetric subwavelength gratings and a passive hyperbolic metamaterial engineered to display a transmission window centred at a lateral spatial frequency substantially exceeding the diffraction limit.
Abstract: Optical devices with asymmetric transmission are desirable for many applications, but fabrication difficulties impede visible frequency operation. Xu and Lezec overcome this by combining nonsymmetric subwavelength gratings with a hyperbolic metamaterial to realize efficient asymmetric transmission.

128 citations

Book ChapterDOI
01 Jan 2012
TL;DR: Self-accelerating Airy beams as mentioned in this paper have attracted a great deal of interest due to their unique properties and many proposed applications in areas such as optical micromanipulation, plasma guidance, vacuum electron acceleration and routing surface plasmon polaritons.
Abstract: Recently, a specific type of nondiffracting beams named self-accelerating Airy beams has attracted a great deal of interest due to their unique properties and many proposed applications in areas such as optical micromanipulation, plasma guidance, vacuum electron acceleration, and routing surface plasmon polaritons. In contradistinction with Bessel beams, Airy beams do not rely on simple conical superposition of plane waves, and they possess the properties of self-acceleration in addition to nondiffraction and self-healing. For the past few years, tremendous research work has been devoted to the study of Airy beams, from theoretical predictions to experimental observations, from linear control to nonlinear self-trapping, and from fundamental aspects to demonstrations of potential applications. In this chapter, we provide an overview on generation and control of Airy beams and recent developments in the area.

109 citations

Book ChapterDOI
23 Aug 2012
TL;DR: This chapter reviews trends and applications of SLMs with focus on liquid crystal on silicon (LCOS) technology and phase modulators based on 2D pistonlike mirror arrays or ribbonlike 1D gratings.
Abstract: Spatial light modulator (SLM) is a general term describing devices that are used to modulate amplitude, phase, or polarization of light waves in space and time. Current SLM–based systems use either optical MEMS (microelectromechanical system, [1]) or LCD technology [2]. In this chapter, we review trends and applications of SLMs with focus on liquid crystal on silicon (LCOS) technology. Most developments of liquid crystal (LC) microdisplays are driven by consumer electronics industry for rear–projection TVs, front projectors, and picoprojectors. Also,MEMS technologies such as digitalmicromirror device (DMD, [3]) and grating light valve (GLV, [4]) are driven by these industries, except for membrane mirrors. Some industrial applications have forced MEMS development for scanning, printing technologies, and automotive applications [5]. But the major R&D-related driving force for new SLM technologies is the defense industry. Technological advances in lithography are the basis for MEMS developments. Phase modulators based on 2D pistonlike mirror arrays [6, 7] or ribbonlike 1D gratings [8] show high performance in frame rate. Unfortunately, the availability of these technologies is limited because they are developed either company-internal or within defence projects. The major advantages of MEMS are frame rate, spectral range, and an efficient use of nonpolarized light. Phase modulators and other optical implementations are still niche markets for the MEMS industry. Even now, customized MEMS developments are quite challenging and expensive. LC panels still have an advantage out of their projection applications in terms of resolution and minimal pixel size for 2D displays. Only LC-based technology is able to modulate intensity, phase, and/or polarization because of polarization rotation and/or electrically controlled birefringence (ECB). LCOS technology [9] was developed for frontand rear(RPTV) projection systems competing with AMLCD (active matrix LCD) and DMD. The reflective arrangement due to silicon backplane allows putting a high number of pixels in a small panel, keeping the fill factor ratio high even for micrometer-sized pixels.

100 citations