Homogenous isotropic invisible cloak based on geometrical optics

One-way invisible cloak using parity-time symmetric transformation optics.

We propose a one-way invisible cloak using transformation optics of parity-time (PT) symmetric optical materials. At the spontaneous PT-symmetry breaking point, light is scattered only for incidence along one direction since the phase-matching condition is unidirectionally satisfied, making the cloak one-way invisible. Moreover, optical scattering from the one-way cloak can be further engineere...

Metamaterial-Based Cylinders Used for Invisible Cloak Realization

Invisible cloak with easily-realizable metamaterials

A new elliptical invisible cloak is proposed using a coordinate transformation in the elliptical-cylindrical coordinate system, which crushes the cloaked object to a line segment instead of a point. The elliptical cloak is reduced to a nearly-circular cloak if the elliptical focus becomes very small. The advantage of the proposed invisible cloak is that none of the parameters is singular and th...

Fast Subsurface Sar Simulator Based on Geometrical Optics

In previous work [1], we investigated the design of a two frequency synthetic aperture radar interferometer for estimating the sand layer thickness and the bedrock topography in deserts and arid areas. This was shown to be very useful in many applications such as oil field explorations, environmental studies and archaeological surveys. In order to test the inversion algorithm for different comp...

A Fast Method for Linear Waves Based on Geometrical Optics

We develop a fast method for solving the one-dimensional wave equation based on geometrical optics. From geometrical optics (e.g., Fourier integral operator theory or WKB approximation) it is known that high-frequency waves split into forward and backward propagating parts, each propagating with the wave speed, with amplitude that is slowly changing depending on the medium coefficients, under t...