Relevant bibliographies by topics / Unidirectional scattering

Academic literature on the topic 'Unidirectional scattering'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Unidirectional scattering"

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Chen, Jianfeng, Jianbo Pan, Yidong Zheng, Wenyao Liang, and Zhi-Yuan Li. "Unidirectional electromagnetic windmill scattering in a magnetized gyromagnetic cylinder." Chinese Optics Letters 20, no. 5 (2022): 053901. http://dx.doi.org/10.3788/col202220.053901.

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Loran, Farhang, and Ali Mostafazadeh. "Unidirectional invisibility and non-reciprocal transmission in two and three dimensions." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2191 (July 2016): 20160250. http://dx.doi.org/10.1098/rspa.2016.0250.

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We explore the phenomenon of unidirectional invisibility in two dimensions, examine its optical realizations and discuss its three-dimensional generalization. In particular, we construct an infinite class of unidirectionally invisible optical potentials that describe the scattering of normally incident transverse electric waves by an infinite planar slab with refractive-index modulations along both the normal directions to the electric field. A by-product of this investigation is a demonstration of non-reciprocal transmission in two dimensions. To elucidate this phenomenon, we state and prove a general reciprocity theorem that applies to quantum scattering theory of real and complex potentials in two and three dimensions.
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Xue, Fengxia, Haihua Fan, Qiaofeng Dai, Haiying Liu, and Sheng Lan. "Broadband unidirectional scattering in the transverse direction and angular radiation realized by using a silicon hollow nanodisk under a radially polarized beam." Journal of Physics D: Applied Physics 55, no. 9 (November 26, 2021): 095111. http://dx.doi.org/10.1088/1361-6463/ac394c.

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Abstract In recent years, directional scattering has been one of the most active research hotspots in the field of nanophotonics. Herein, we study the directional scattering properties of a silicon hollow nanodisk (SHND) illuminated by a tightly focused radially polarized beam. The induced strong longitudinal total electric dipole interferes with transverse magnetic dipole to achieve a highly-efficient transverse unidirectional scattering when the SHND is located at a specific position in the focal plane. Moreover, the manipulated unidirectional scattering in the transverse direction can be realized in the broad wavelength range from 581 nm to 656 nm. In addition, the unidirectional angular radiation towards all directions can be realized by adjusting the position of the SHND. Our research results are helpful for the design of nanophotonic devices that can manipulate the angular radiation direction, and have potential applications in sensing, optical communications, solar cells and other fields.
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Zhang Ming, 张明, 吕靖薇 Lü Jingwei, 杨琳 Yang Lin, 许文静 Xu Wenjing, 王建鑫 Wang Jianxin, 刘超 Liu Chao, and 牟海维 Mou Haiwei. "Unidirectional Scattering Properties of Silicon Nanocross Dimer." Laser & Optoelectronics Progress 56, no. 8 (2019): 081601. http://dx.doi.org/10.3788/lop56.081601.

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Mostafazadeh, Ali. "Adiabatic approximation, semiclassical scattering, and unidirectional invisibility." Journal of Physics A: Mathematical and Theoretical 47, no. 12 (March 6, 2014): 125301. http://dx.doi.org/10.1088/1751-8113/47/12/125301.

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Reena, Yogita Kalra, Ajeet Kumar, and R. K. Sinha. "Tunable unidirectional scattering of ellipsoidal single nanoparticle." Journal of Applied Physics 119, no. 24 (June 28, 2016): 243102. http://dx.doi.org/10.1063/1.4954675.

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Rocco, Davide, Michele Midrio, and Costantino De Angelis. "Polarization Independent Unidirectional Scattering With Turnstile Nanoantennas." IEEE Photonics Journal 12, no. 6 (December 2020): 1–8. http://dx.doi.org/10.1109/jphot.2020.3030306.

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Yong Wang, Yong Wang, Xianghao Zeng Xianghao Zeng, Erchan Yang Erchan Yang, Yonghua Lu Yonghua Lu, Douguo Zhang Douguo Zhang, and and Pei Wang and Pei Wang. "Tailoring magnetic and electric resonances with dielectric nanocubes for broadband and high-efficiency unidirectional scattering." Chinese Optics Letters 14, no. 1 (2016): 011601–11604. http://dx.doi.org/10.3788/col201614.011601.

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Shibanuma, Toshihiko, Pablo Albella, and Stefan A. Maier. "Unidirectional light scattering with high efficiency at optical frequencies based on low-loss dielectric nanoantennas." Nanoscale 8, no. 29 (2016): 14184–92. http://dx.doi.org/10.1039/c6nr04335f.

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Sun, Song, Dacheng Wang, Zheng Feng, and Wei Tan. "Highly efficient unidirectional forward scattering induced by resonant interference in a metal–dielectric heterodimer." Nanoscale 12, no. 43 (2020): 22289–97. http://dx.doi.org/10.1039/d0nr07010f.

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Dissertations / Theses on the topic "Unidirectional scattering"

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Liu, Wenlung. "Multiple Wave Scattering and Calculated Effective Stiffness and Wave Properties in Unidirectional Fiber-Reinforced Composites." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30646.

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Analytic methods of elastic wave scattering in fiber-reinforced composite materials are investigated in this study to calculate the effective static stiffness (axial shear modulus, m) and wave properties (axially shear wave speed, B and attenuation, Y) in composites. For simplicity only out-of-plane shear waves are modeled propagating in a plane transverse to the fiber axis. Statistical averaging of a spatially random distribution of fibers is performed and a simultaneous system of linear equations are obtained from which the effective global wave numbers are numerically calculated. The wave numbers, K=Re(K)+iIm(K), are complex numbers where the real parts are used to compute the effective axial shear static stiffness and wave speed; the imaginary parts are used to compute the effective axial shear wave attenuation in composites. Three major parts of this study are presented. The first part is the discussion of multiple scattering phenomena in a successive-events scattering approach. The successive-events scattering approach is proven to be mathematically exact by comparing the results obtained by the many-bodies-single-event approach. Scattering cross-section is computed and comparison of the first five scattering orders is made. Furthermore, the ubiquitous quasi-crystalline approximation theorem is given a justifiable foundation in the fiber-matrix composite context. The second part is to calculate m, B and Y for fiber-reinforced composites with interfacial layers between fibers and matrix. The material properties of the layers are assumed to be either linearly or exponentially distributed between the fibers and matrix. A concise formula is obtained where parameters can be computed using a computationally easy-to-program determinant of a square matrix. The numerical computations show, among other things, that the smoother (more divisional layers), or thinner, the interfacial region the less damped are the composite materials. Additionally composites with exponential order distribution of the interfacial region are more damped than the linear distribution ones. The third part is to calculate m, B and Y for fiber-reinforced composites with interfacial cracks. The procedures and computational techniques are similar to those in the second part except that the singularity near the crack tip needs the Chebychev function as a series expansion to be adopted in the computation. Both the interfacial layers and interfacial crack cases are analyzed in the low frequency range. The analytic results show that waves in both cases are attenuated and non-dispersive in the low frequency range. The composites with interfacial layers are transversely isotropic, while composites with interfacial cracks are generally transversely anisotropic.
Ph. D.
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Liu, Wei. "Light manipulation by plasmonic nanostructures." Phd thesis, 2013. http://hdl.handle.net/1885/10308.

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This thesis studies various effects based on the excitation of surfaces plasmons in various plasmonic nanostructures. We start the thesis with a general introduction of the field of plasmonics in Chapter 1. In this chapter we discuss both propagating surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs), how they are related to each other through the Bohr condition, the features of subwavelength confinement and near-field enhancement, and wave guidance through coupled LSPs. Then after the discussion of the achievements and challenges in this field (Section 1.3) we will outline the basic structure of the thesis at the end of this chapter (Section 1.4). In Chapter 2 we demonstrate a new mechanism to achieve complete spectral gap without periodicity along propagation direction based on the coupling of backward and forward modes supported by plasmonic nanostructures. We study the backward modes in single cylindrical plasmonic structures (Section 2.2) and focus on the two simplest cases: nanowires and nanocavities. Afterwards, we demonstrate how to achieve spectral gaps in coupled plasmonic nanocavities (Section 2.3). A polarization-dependent spectral gap is achieved firstly in two coupled nanocavities which support forward and backward modes respectively (Section 2.3.1). At the end we demonstrate a complete spectral gap, which is induced by the symmetry of a four-coupled-nanocavity system (Section 2.3.2). In Chapter 3 we study beam shaping in plasmonic potentials. Based on the similarity between Schrodinger equation for matter waves and paraxial wave equation for photons, we introduce the concept of plasmonic potentials and demonstrate how to obtain different kinds of potentials for SPPs in various modulated metal-dielectric-metal (MDM) structures. We investigate firstly the parabolic potentials in quadratically modulated MDM and the beam manipulations in such potentials, including polychromatic nanofocusing in full parabolic potentials (Section 3.2.1), plasmonic analogue of quantum paddle balls in half parabolic potentials (Section 3.2.2), and adiabatic nanofocusing in tapered parabolic potentials (Section 3.2.3). In the following section (Section 3.3) we show the existence of linear plasmonic potentials in wedged MDM and efficient steering of the Airy beams in such potentials (Section 3.3.2) after a brief introduction on Airy beams in free space (Section 3.3.1). In Chapter 4 we study scattering engineering by magneto-dielectric core-shell nanostructures. The introduction part (Section 4.1) gives a brief overview on the scattering of solely electric dipole (ED) or magnetic dipole (MD), and how the coexistence and interference of the ED and the MD can bring extra flexibility for scattering shaping. Afterwards, we discuss the scattering shaping by core-shell nanostructures through the interferences of electric and artificial magnetic dipoles (Section 4.2), including two examples of broadband unidirectional scattering by core-shell nanospheres (Section 4.2.1) and efficient scattering pattern shaping of core-shell nanowires (Section 4.2.2). At the end of this chapter we demonstrate polarization independent Fano resonances in arrays of core-shell nanospheres (Section 4.3.2). At the end of this thesis (Chapter 5) we summarize the results and draw the conclusions. We also discuss the challenges and possible future developments of the field of plasmonics.
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Conference papers on the topic "Unidirectional scattering"

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Mantri, Richa, Reena, and Ajeet Kumar. "Unidirectional Scattering by All-dielectric Cuboidal Nanoparticle." In Frontiers in Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jw3a.44.

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Giglioli de Oliveira, Daniel Marcus, Vanessa Vieira Gonçalves, and Auteliano Antunes dos Santos Junior. "Scattering of ultrasonic waves in unidirectional composites." In 7th International Symposium on Solid Mechanics. ABCM, 2019. http://dx.doi.org/10.26678/abcm.mecsol2019.msl19-0003.

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Sun, Song, Dacheng Wang, Zheng Feng, and Wei Tan. "Enabling Efficient Unidirectional Forward Scattering via Metal-dielectric Heterodimer." In 2021 International Applied Computational Electromagnetics Society (ACES-China) Symposium. IEEE, 2021. http://dx.doi.org/10.23919/aces-china52398.2021.9581503.

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Reddy, A. R., and S. K. Lahiri. "Scattering Parameters of Electrically Loaded S.A.W. Group Type Unidirectional Transducers." In 39th Annual Symposium on Frequency Control. IEEE, 1985. http://dx.doi.org/10.1109/freq.1985.200892.

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Verellen, Niels, Dries Vercruysse, Yannick Sonnefraud, Xuezhi Zheng, Giuliana Di Martino, Guy A. E. Vandenbosch, Liesbet Lagae, Victor V. Moshchalkov, Stefan A. Maier, and Pol Van Dorpe. "Unidirectional Scattering and Emission of Light Mediated by a Single-Element Nanoantenna." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/cleo_at.2014.jw2a.100.

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Budak, Vladimir P., Kirill V. Klimenko, and Dmitry A. Klyuykov. "Calculation of Light Field Created by Point Unidirectional Source in 3‐Dimensional Scattering Media." In CURRENT PROBLEMS IN ATMOSPHERIC RADIATION (IRS 2008): Proceedings of the International Radiation Symposium (IRC/IAMAS). American Institute of Physics, 2009. http://dx.doi.org/10.1063/1.3116959.

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Hervin, Flora, and Paul Fromme. "Modelling Anisotropy Influence on Guided Wave Scattering at Composite Delaminations." In 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/qnde2021-74591.

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Abstract Carbon fibre reinforced composite laminates are widely used in aerospace structures but are prone to barely visible impact damage (BVID). Depending on impact severity, delaminations can form below the surface of the laminate, reducing the load bearing capacity. Efficient structural health monitoring (SHM) of composite panels can be achieved using guided waves propagating along the structure. Propagation and scattering of the A0 Lamb wave mode in a quasi-isotropic composite laminate was modelled using full three-dimensional (3D) Finite Element (FE) simulations. Individual ply layers were modelled using homogeneous unidirectional composite material properties to accurately capture the anisotropy effects. FE predictions for scattering and energy trapping at delaminations were compared to experimental measurements. Noncontact, full-wavefield guided wave measurements were obtained using a laser vibrometer. Good agreement was found between experiments and FE predictions. The effect of delamination shape and depth was investigated through a numerical parameter study. The angular dependency of the amplitude of the scattered wave was calculated. The influence of ply layer anisotropy on wave propagation in an undamaged laminate was investigated numerically. The sensitivity of guided waves for the detection of delaminations due to barely visible impact damage (BVID) in composite panels has been verified.
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Mahapatra, D. Roy, S. Gopalakrishnan, and T. S. Sankar. "Scattering and Transmission of Mixed-Mode Waves in Delaminated Thick Composite Beams." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21543.

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Abstract A spectral finite element model is developed to study scattering and transmission of axial-flexural-torsional coupled waves in multi-sitedelaminated thick composite beams. The analysis may find its suitability and superiority to capture the high frequency dynamics of laminated composite structure in vibrating environment and for health monitoring in combination with non-destructive test data. Spectral finite element considering first order shear deformation is used to model the delaminated segments along the span of the beam, as well as the delaminated ply-groups in thickness direction. This spectral element is derived from exact solution to the 3D governing wave equations in Fourier domain. As aresult, the thin sublaminates and beam segments do not lock. Spatial discretization is carried out in a similar way as in conventional finite element method. The major differences from conventional finite element method are (1) the transformation of all the fields from temporal to frequency domain is carried out using Fast Fourier Transform (FFT) algorithm, (2) the global system is solved at each frequency step (3) fine meshing at the delamination tip to capture the crack-tip singularity (as in conventional finite element discretization) is not required (4) the overall system size becomes many order smaller than that in conventional finite element methods. The study essentially includes unsymmetry induced due to ply orientations and due to multiple delamination across beam thickness. A case study is presented to show the effect of wave transmission and scattering by a single through delamination in unidirectional composite beam.
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Zang, J., R. Gibson, P. H. Taylor, R. Eatock Taylor, and C. Swan. "Non-Linear Wave Diffraction Around a Moored Ship." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51589.

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The objective of this research, part of the FP5 REBASDO Programme, is to examine the effects of directional wave spreading on the nonlinear hydrodynamic loads and the wave run-up around the bow of a floating vessel (FPSO) in random seas. In this work, the non-linear wave scattering problem is solved by employing a quadratic boundary element method. An existing scheme (DIFFRACT developed in Oxford) has been extended to deal with uni-directional and directional bi-chromatic input wave systems, calculating second-order wave diffraction under regular waves and focused wave groups. The second order wave interaction with a floating vessel in a unidirectional focused wave group is presented in this paper. Comparison of numerical results and the experimental measurements conducted at Imperial College shows excellent agreement. The second-order free surface components at the bow of the ship are very significant, and cannot be neglected if one requires accurate prediction of the wave-structure interaction; otherwise a major underestimation of the wave impact on the structure could occur.
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Shultz, Tyler, Manuel Rauch, and Ellen Kuhl. "Collagen Orientation in the Anterior Mitral Valve Leaflet." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53191.

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The Mitral Valve (MV) serves to ensure unidirectional blood flow from the pulmonary to systemic circulation. When the MV fails to function correctly, backflow from the left ventricle to left atrium occurs during heart contraction. This condition is called Mitral Valve Regurgitation (MVR) and is estimated to affect 2 to 2.5 million people in the United States alone [1]. Surgical techniques exist to repair MVR, and each affects the structure of the valve in a different way [2]. As the main load-bearing structure in the leaflets, collagen fibers have a tremendous impact on how the leaflets are able to support pressure loads, and their orientation has great functional implications. The goal of this study is therefore to investigate the microstructure of mitral valve tissue. Since collagen makes up approximately 60% of the dry weight of the leaflet [3], we focused our study on this macromolecule. In a complementary in-vivo study, we computed mitral leaflet strains in radial and circumferential direction using a continuum mechanical approach based on the 4D coordinates of 23 radiopaque markers sewn onto the anterior MV leaflet [4]. Results shown in Figure 1. As clearly seen from the figure, strains exhibit pronounced anisotropy. We expect that comparison of the collagen orientation in the leaflet with the these strain profiles will enhance our knowledge of the role of collagen in MV mechanics and the effect that potential surgical interventions may have on MV functionality. While collagen orientation has been determined using Small Angle Light Scattering [5], Polarized Light Microscopy [5], and X-ray Diffraction [6], histological methods to characterize the collagen orientation over the entire leaflet have not been reported. Therefore, we will study the orientation of collagen throughout the anterior ovine MV leaflet using tissue histology.
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