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  1. AU="Sheng, Xin-Qing"
  2. AU="Marrink, Siewert J"
  3. AU="Boland, Fiona"
  4. AU="Semcesen, Liana N"
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  8. AU="Xueting Feng"
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  1. Article ; Online: Scattering center models of backscattering waves by dielectric spheroid objects.

    Guo, Kun-Yi / Han, Xiao-Zhe / Sheng, Xin-Qing

    Optics express

    2018  Volume 26, Issue 4, Page(s) 5060–5074

    Abstract: Scattering center models provide a simple and effective way of describing the complex electromagnetic scattering phenomena of targets and have been successfully applied in radar applications. However, the existing models are limited to conducting objects. ...

    Abstract Scattering center models provide a simple and effective way of describing the complex electromagnetic scattering phenomena of targets and have been successfully applied in radar applications. However, the existing models are limited to conducting objects. Numerical results show that scattering centers of dielectric objects are far more complex than conducting objects and most of them are distributed beyond the object. For the lossless and low-loss media, the major scattering contributions to total fields are surface waves and multiple internal reflections rather than the direct reflection. Concise scattering center models for backscattering from dielectric spheroid objects are proposed in this work, which can characterize the backscattered waves by scattering centers with sparse and physical parameters. Good agreement has been demonstrated between the high resolution range profiles simulated by this model with those obtained by Mie series and the full wave numerical method.
    Language English
    Publishing date 2018-02-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.26.005060
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effective media properties of hyperuniform disordered composite materials.

    Wu, Bi-Yi / Sheng, Xin-Qing / Hao, Yang

    PloS one

    2017  Volume 12, Issue 10, Page(s) e0185921

    Abstract: The design challenge of new functional composite materials consisting of multiphase materials has attracted an increasing interest in recent years. In particular, understanding the role of distributions of ordered and disordered particles in a host media ...

    Abstract The design challenge of new functional composite materials consisting of multiphase materials has attracted an increasing interest in recent years. In particular, understanding the role of distributions of ordered and disordered particles in a host media is scientifically and technologically important for designing novel materials and devices with superior spectral and angular properties. In this work, the effective medium property of disordered composite materials consisting of hyperuniformly distributed hard particles at different filling fractions is investigated. To accurately extract effective permittivity of a disordered composite material, a full-wave finite element method and the transmission line theory are used. Numerical results show that the theory of hyperuniformity can be conveniently used to design disordered composite materials with good accuracy compared with those materials with randomly dispersed particles. Furthermore, we demonstrate that a Luneburg lens based on the proposed hyperuniform media has superior radiation properties in comparison with previously reported metamaterial designs and it may open up a new avenue in electromagnetic materials-by-design.
    MeSH term(s) Electromagnetic Radiation ; Manufactured Materials ; Models, Theoretical
    Language English
    Publishing date 2017
    Publishing country United States
    Document type Journal Article
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0185921
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Full-wave modeling of broadband near field scanning microwave microscopy.

    Wu, Bi-Yi / Sheng, Xin-Qing / Fabregas, Rene / Hao, Yang

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 16064

    Abstract: A three-dimensional finite element numerical modeling for the scanning microwave microscopy (SMM) setup is applied to study the full-wave quantification of the local material properties of samples. The modeling takes into account the radiation and ... ...

    Abstract A three-dimensional finite element numerical modeling for the scanning microwave microscopy (SMM) setup is applied to study the full-wave quantification of the local material properties of samples. The modeling takes into account the radiation and scattering losses of the nano-sized probe neglected in previous models based on low-frequency assumptions. The scanning techniques of approach curves and constant height are implemented. In addition, we conclude that the SMM has the potential for use as a broadband dielectric spectroscopy operating at higher frequencies up to THz. The results demonstrate the accuracy of previous models. We draw conclusions in light of the experimental results.
    Language English
    Publishing date 2017-11-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-13937-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Prediction of radiation pressure force exerted on moving particles by the two-level skeletonization.

    Pan, Xiao-Min / Gou, Ming-Jiang / Sheng, Xin-Qing

    Optics express

    2014  Volume 22, Issue 8, Page(s) 10032–10045

    Abstract: A fast full-wave method for computing radiation pressure force (RPF) exerted by shaped light beams on moving particles is presented. The problem of evaluating RPF exerted on a moving particle by a single excitation beam is converted into that of ... ...

    Abstract A fast full-wave method for computing radiation pressure force (RPF) exerted by shaped light beams on moving particles is presented. The problem of evaluating RPF exerted on a moving particle by a single excitation beam is converted into that of computing RPF's exerted on a static particle by multiple beams. The discretization of different beams leads to distinct right hand sides (RHS's) for the matrix system. To avoid solving each RHS by the brute-force manner, the algorithm conducts low-rank decomposition on the excitation matrix consisting of all RHS's to figure out the so-called skeleton light beams by interpolative decomposition (ID). The peak memory requirement of the skeletonization is a bottle-neck if the particle is large. A two-level skeletonization scheme is proposed to solve this problem. Some numerical experiments on arbitrarily shaped homogeneous particles are performed to illustrate the performance and capability of the developed method.
    Language English
    Publishing date 2014-04-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.22.010032
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Prediction of metallic nano-optical trapping forces by finite element-boundary integral method.

    Pan, Xiao-Min / Xu, Kai-Jiang / Yang, Ming-Lin / Sheng, Xin-Qing

    Optics express

    2015  Volume 23, Issue 5, Page(s) 6130–6144

    Abstract: The hybrid of finite element and boundary integral (FE-BI) method is employed to predict nano-optical trapping forces of arbitrarily shaped metallic nanostructures. A preconditioning strategy is proposed to improve the convergence of the iterative ... ...

    Abstract The hybrid of finite element and boundary integral (FE-BI) method is employed to predict nano-optical trapping forces of arbitrarily shaped metallic nanostructures. A preconditioning strategy is proposed to improve the convergence of the iterative solution. Skeletonization is employed to speed up the design and optimization where iteration has to be repeated for each beam configuration. The radiation pressure force (RPF) is computed by vector flux of the Maxwell's stress tensor. Numerical simulations are performed to validate the developed method in analyzing the plasmonic effects as well as the optical trapping forces. It is shown that the proposed method is capable of predicting the trapping forces of complex metallic nanostructures accurately and efficiently.
    Language English
    Publishing date 2015-03-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.23.006130
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Accurate modeling of high order spatial dispersion of wire medium.

    Song, Wei / Yang, Zhun / Sheng, Xin-Qing / Hao, Yang

    Optics express

    2013  Volume 21, Issue 24, Page(s) 29836–29846

    Abstract: The wire medium consisting of an array of parallel thin metallic wires was previously studied by using an effective medium with spatial dispersion. In this paper, the validity of conventional effective model was examined analytically and numerically by ... ...

    Abstract The wire medium consisting of an array of parallel thin metallic wires was previously studied by using an effective medium with spatial dispersion. In this paper, the validity of conventional effective model was examined analytically and numerically by studying a canonical structure of the wire medium. It is noted that the conventional model fails for high transversal spatial harmonics, which consequently results in discrepancy in the scattering between the effective model and the physical structure. In this study, we propose a new effective model to include higher order spatial dispersions: instead of the second-order expansion, the proposed dispersion equation is based on the fourth-order expansion of the dispersion equation of the photonic states. Compared with the 3D full-wave simulation results of the wire medium, the proposed model has demonstrated significant improvement in numerical accuracy in characterizing the EM behavior in this type of metamaterials.
    Language English
    Publishing date 2013-12-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.21.029836
    Database MEDical Literature Analysis and Retrieval System OnLINE

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