Sat, 26 Jul 2008 00:41:02 BST CiteULike: norris Chan http://www.citeulike.org/user/norris/author/Chan CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/norris/article/2794980 <i>(9 May 2008)</i><br /><br />We show that the optical properties of an oblique layered system with two kinds of isotropic materials can be described using the concept of transformation media as long as the thickness of the layers is much smaller than the wavelength. Once the connection with transformation media is established, we then show that oblique layered system can serve as a universal element to build a variety of interesting functional optical components such as wave splitters, wave combiners, one-dimensional cloaking devices and reflectionless field rotators. Electromagnetic wave manipulation using layered systems Huanyang Chen CT Chan (9 May 2008) 2008-05-13T13:19:42-00:00 2008 cloaking http://www.citeulike.org/user/norris/article/2329458 <i>Physical Review E, Vol. 70, No. 5. (18 November 2004), 055602.</i><br /><br />We show here the existence of acoustic metamaterial; in which both the effective density and bulk modulus are simultaneously negative; in the true and strict sense of an effective medium. Our double-negative acoustic system is an acoustic analogue of Veselago’s medium in electromagnetism; and shares many unique consequences; such as negative refractive index. The double negativity in acoustics is derived from low-frequency resonances; as in the case of electromagnetism; but the negative density and modulus are derived from a single resonance structure as distinct from electromagnetism in which the negative permeability and negative permittivity originates from different resonance mechanisms. Double-negative acoustic metamaterial Jensen Li CT Chan doi:10.1103/PhysRevE.70.055602 Physical Review E, Vol. 70, No. 5. (18 November 2004), 055602. 2008-02-04T13:10:30-00:00 2004 Physical Review E 70 5 055602 American Physical Society metamaterial http://www.citeulike.org/user/norris/article/2291016 <i>Applied Physics Letters, Vol. 90, No. 24. (2007)</i><br /><br />  Transformation media that rotate electromagnetic fields Huanyang Chen CT Chan Applied Physics Letters, Vol. 90, No. 24. (2007) 2008-01-25T17:10:44-00:00 2007 Applied Physics Letters 90 24 AIP cloaking metamaterial http://www.citeulike.org/user/norris/article/2286703 <i>(24 Dec 2007)</i><br /><br />We obtained the group velocity expressions for both two dimensional and three dimensional cloaks from the dispersion relations. The group velocity and energy transport velocity distributions for a 3D ideal cloak are shown explicitly. Near the operation frequency, its magnitude is always smaller than the velocity of light. The group and energy transport velocities have rather peculiar distributions. The velocity along a line joining the origin of the cloak is a constant, while the velocities approach zero at the inner boundary of the cloak. A ray pointing right into the origin of the cloak will experience abrupt changes of velocities when it impinges on the inner surface of the cloak. The group and energy transport velocity distributions for ideal invisibility cloaks Huanyang Chen CT Chan (24 Dec 2007) 2008-01-25T02:30:52-00:00 2007 cloaking metamaterial http://www.citeulike.org/user/norris/article/2282306 <i>Applied Physics Letters, Vol. 91, No. 18. (2007)</i><br /><br />  Acoustic cloaking in three dimensions using acoustic metamaterials Huanyang Chen CT Chan Applied Physics Letters, Vol. 91, No. 18. (2007) 2008-01-23T22:50:04-00:00 2007 Applied Physics Letters 91 18 AIP metamaterial http://www.citeulike.org/user/norris/article/1172258 <i>Physical Review B (Condensed Matter and Materials Physics), Vol. 71, No. 1. (2005)</i><br /><br />A simple analytic model is presented to describe the low-frequency effective mass densities of three-component phononic crystals with local resonances. We show that the effective mass densities can turn negative close to the local resonances. Expressions for the effective mass densities are derived for both three-dimensional systems with coated spheres embedded in a host matrix, and two-dimensional systems with coated cylinders embedded in a host matrix. Analytic model of phononic crystals with local resonances Zhengyou Liu CT Chan Ping Sheng doi:10.1103/PhysRevB.71.014103 Physical Review B (Condensed Matter and Materials Physics), Vol. 71, No. 1. (2005) 2007-03-18T22:45:32-00:00 2005 Physical Review B (Condensed Matter and Materials Physics) 71 1 APS phonons