CST – Computer Simulation Technology

Route towards cylindrical cloaking at visible frequencies using an optimization algorithm
Andreas Rottler, Benjamin Krüger, Detlef Heitmann, Daniela Pfannkuche, Stefan Mendach
Volume: 86, Issue: 24, 19 December 2012
245120 - 245120-6
cylindrical cloaking, optimization algorithm
We derive a model based on theMaxwell-Garnett effective-medium theory that describes a cylindrical cloaking shell composed of metal rods which are radially aligned in a dielectric host medium.We propose and demonstrate a minimization algorithm that calculates for given material parameters the optimal geometrical parameters of the cloaking shell such that its effective optical parameters fit the best to the required permittivity distribution for cylindrical cloaking. By means of sophisticated full-wave simulations we find that a cylindrical cloak with good performance using silver as the metal can be designed with our algorithm for wavelengths in the red part of the visible spectrum (623 nm < ? < 773 nm). We also present a full-wave simulation of such a cloak at an exemplary wavelength of ? = 729 nm (¯h? = 1.7 eV) which indicates that our model is useful to find design rules of cloaks with good cloaking performance. Our calculations investigate a structure that is easy to fabricate using standard preparation techniques and therefore pave the way to a realization of guiding light around an object at visible frequencies, thus rendering it invisible.

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