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6 May 2008 Infrared cloaking based on wire media
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Abstract
Novel approach to cloaking, which allows to realize directly the idea of wave guiding and to eliminate the reflection from the cloaked structure, is proposed. Cloaking structure is composed of metal wires guiding TEM modes around the object. In high conductive metal wires at microwave frequencies, the TEM modes are dispersionless and the energy propagates along the wires. A plane wave incident onto a wire medium (WM) under any angle, excites both TEM and TM modes, which have similar polarizations. The TEM modes provide full transmission through the cloaking structure if the total length of wires equals a number of half-wavelengths. The TM mode attenuates in WM at frequencies below the plasma frequency of WM and does not contribute to reflection if the WM is dense enough. The angle between WM and the propagation direction of the incoming wave is chosen so that the difference in paths of waves in WM and free space outside the cloak is a multiple of wavelengths in order to eliminate distortion of the phase front. In the infrared range quasi-TEM modes, supporting propagation of plasmons, play role of TEM modes. Parameters of WM are chosen so that the quasi-TEM modes have low dispersion and their phase velocity is slightly less than the speed of light. Results of HFSS simulations demonstrate considerable cloaking effect.
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Igor S. Nefedov, Dmitry Chicherin, and Ari J. Viitanen "Infrared cloaking based on wire media", Proc. SPIE 6987, Metamaterials III, 698728 (6 May 2008); https://doi.org/10.1117/12.786789
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