Physics – Optics
Scientific paper
2007-11-12
Phys. Rev. Lett. 100, 063903 (2008)
Physics
Optics
submitted to the journal on Sep 10 2007, abstract changed to make it more accessible, keywords added
Scientific paper
10.1103/PhysRevLett.100.063903
Transformation optics offers an unconventional approach to the control of electromagnetic fields. A transformation optical structure is designed by first applying a form-invariant coordinate transform to Maxwell's equations, in which part of free space is distorted in some desired manner. The coordinate transformation is then applied to the permittivity and permeability tensors to yield the specification for a complex medium with desired functionality. The transformation optical structures proposed to date, such as electromagnetic "invisibility" cloaks and concentrators, are inherently reflectionless and leave the transmitted wave undisturbed. Here we expand the class of transformation optical structures by introducing finite, embedded coordinate transformations, which allow the electromagnetic waves to be steered or focused. We apply the method to the design of several devices, including a parallel beam shifter and a beam splitter, both of which exhibit unusual electromagnetic behavior as confirmed by 2D full-wave simulations. The devices are designed to be reflectionless, in accordance with a straightforward topological criterion.
Cummer Steven A.
Pendry John B.
Rahm Marco
Schurig David
Smith David R.
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