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Dive into the research topics where Baile Zhang is active.

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Featured researches published by Baile Zhang.


Physical Review Letters | 2011

Macroscopic invisibility cloak for visible light.

Baile Zhang; Yuan Luo; Xiaogang Liu; George Barbastathis

Invisibility cloaks, a subject that usually occurs in science fiction and myths, have attracted wide interest recently because of their possible realization. The biggest challenge to true invisibility is known to be the cloaking of a macroscopic object in the broad range of wavelengths visible to the human eye. Here we experimentally solve this problem by incorporating the principle of transformation optics into a conventional optical lens fabrication with low-cost materials and simple manufacturing techniques. A transparent cloak made of two pieces of calcite is created. This cloak is able to conceal a macroscopic object with a maximum height of 2 mm, larger than 3500 free-space-wavelength, inside a transparent liquid environment. Its working bandwidth encompassing red, green, and blue light is also demonstrated.


Physical Review Letters | 2008

Extraordinary surface voltage effect in the invisibility cloak with an active device inside.

Baile Zhang; Hongsheng Chen; Bae-Ian Wu; Jin Au Kong

The electromagnetic field solution for a spherical invisibility cloak with an active device inside is established. Extraordinary electric and magnetic surface voltages are induced at the inner boundary of a spherical cloak, which prevent electromagnetic waves from going out. The phase and handness of polarized waves obliquely incident on such boundaries are kept in the reflected waves. The surface voltages due to an electric dipole inside the concealed region are found equal to the auxiliary scalar potentials at the inner boundary, which consequently gain physical counterparts in this case.


Nature Communications | 2013

Ray-optics cloaking devices for large objects in incoherent natural light

Hongsheng Chen; Bin Zheng; Lian Shen; Xianmin Zhang; N.I. Zheludev; Baile Zhang

A cloak that can hide living creatures from sight is a common feature of mythology but still remains unrealized as a practical device. To preserve the wave phase, the previous cloaking solution proposed by Pendry and colleagues required transformation of the electromagnetic space around the hidden object in such a way that the rays bending around the object inside the cloak region have to travel faster than those passing it by. This difficult phase preservation requirement is the main obstacle for building a broadband polarization-insensitive cloak for large objects. Here we propose a simplified version of Pendry’s cloak by abolishing the requirement for phase preservation, as it is irrelevant for observation using incoherent natural light with human eyes, which are phase and polarization insensitive. This allows for a cloak design on large scales using commonly available materials. We successfully demonstrate the cloaking of living creatures, a cat and a fish, from the eye.


Physical Review Letters | 2010

Lateral shift makes a ground-plane cloak detectable.

Baile Zhang; Tucker R. Chan; Bae-Ian Wu

We examine the effectiveness of the ground-plane invisibility cloak generated from quasiconformal mapping of electromagnetic space. This cloak without anisotropy will generally lead to a lateral shift of the scattered wave, whose value is comparable to the height of the cloaked object, making the object detectable. This can be explained by the fact that the corresponding virtual space is thinner and wider than it should be. Ray tracing on a concrete model shows that, for a bump with a maximum height of 0.2 units to be hidden, the lateral shift of a ray with 45° incidence is around 0.15 units.


Physical Review Letters | 2012

Experimental demonstration of a free-space cylindrical cloak without superluminal propagation

Su Xu; Xiangxiang Cheng; Sheng Xi; Runren Zhang; Herbert O. Moser; Zhi Shen; Yang Xu; Zhengliang Huang; Xianmin Zhang; Faxin Yu; Baile Zhang; Hongsheng Chen

We experimentally demonstrated an alternative approach of invisibility cloaking that can combine technical advantages of all current major cloaking strategies in a unified manner and thus can solve bottlenecks of individual strategies. A broadband cylindrical invisibility cloak in free space is designed based on scattering cancellation (the approach of previous plasmonic cloaking), and implemented with anisotropic metamaterials (a fundamental property of singular-transformation cloaks). Particularly, nonsuperluminal propagation of electromagnetic waves, a superior advantage of non-Euclidian-transformation cloaks constructed with complex branch cuts, is inherited in this design, and thus is the reason of its relatively broad bandwidth. This demonstration provides the possibility for future practical implementation of cloaking devices at large scales in free space.


Physical Review C | 2004

Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region

X. Zheng; K. A. Aniol; D.S. Armstrong; T. Averett; W. Bertozzi; S. Binet; E. Burtin; Emmanuel Busato; C. Butuceanu; J. R. Calarco; A. Camsonne; G. D. Cates; Z. Chai; J. P. Chen; Seonho Choi; E. Chudakov; F. Cusanno; R. De Leo; A. Deur; S. Dieterich; D. Dutta; J.M. Finn; S. Frullani; H. Gao; J. Gao; F. Garibaldi; S. Gilad; R. Gilman; J. Gomez; J. O. Hansen

We report on measurements of the neutron spin asymmetries


Journal of Materials Chemistry C | 2013

Ab initio study of electronic and optical behavior of two-dimensional silicon carbide

Xiao Lin; Shisheng Lin; Yang Xu; Ayaz Ali Hakro; Tawfique Hasan; Baile Zhang; Bin Yu; Jikui Luo; Erping Li; Hongsheng Chen

A_{1,2}^n


Physical Review Letters | 2004

Precision Measurement of the Neutron Spin Asymmetry A1 n and Spin-Flavor Decomposition in the Valence Quark Region

X. Zheng; K. A. Aniol; D.S. Armstrong; T. Averett; W. Bertozzi; S. Binet; E. Burtin; E. Busato; C. Butuceanu; J. R. Calarco; A. Camsonne; G.D. Cates; Z. Chai; Jian-Ping Chen; Seonho Choi; E. Chudakov; F. Cusanno; R. De Leo; A. Deur; S. Dieterich; D. Dutta; J.M. Finn; S. Frullani; H. Gao; J. Gao; F. Garibaldi; S. Gilad; R. Gilman; J. Gomez; J. O. Hansen

and polarized structure functions


Progress in Electromagnetics Research-pier | 2010

CLOAKING A PERFECTLY CONDUCTING SPHERE WITH ROTATIONALLY UNIAXIAL NIHILITY MEDIA IN MONOSTATIC RADAR SYSTEM

Xiangxiang Cheng; Hongsheng Chen; Xianmin Zhang; Baile Zhang; Bae-Ian Wu

g_{1,2}^n


Physical Review Letters | 2010

Delay-Bandwidth and Delay-Loss Limitations for Cloaking of Large Objects

Hila Hashemi; Baile Zhang; John D. Joannopoulos; Steven G. Johnson

at three kinematics in the deep inelastic region, with

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Fei Gao

Nanyang Technological University

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Zhen Gao

Nanyang Technological University

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Xiao Lin

Nanyang Technological University

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Hongyi Xu

Nanyang Technological University

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Zhaoju Yang

Nanyang Technological University

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Youming Zhang

Nanyang Technological University

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Bae-Ian Wu

Massachusetts Institute of Technology

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George Barbastathis

Massachusetts Institute of Technology

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X. Shi

Nanyang Technological University

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