Baile Zhang
Nanyang Technological University
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Publication
Featured researches published by Baile Zhang.
Physical Review Letters | 2011
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
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
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
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
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
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
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
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
Xiangxiang Cheng; Hongsheng Chen; Xianmin Zhang; Baile Zhang; Bae-Ian Wu
g_{1,2}^n
Physical Review Letters | 2010
Hila Hashemi; Baile Zhang; John D. Joannopoulos; Steven G. Johnson
at three kinematics in the deep inelastic region, with