Journal
OPTICS EXPRESS
Volume 21, Issue 21, Pages 25565-25572Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.025565
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Funding
- Major National Development Project of Scientific Instrument and Equipment [2011YQ150021, 2012YQ150092]
- Key Scientific and Technological Project of Science and Technology Commission of Shanghai Municipality [12142200100, 12JC1407100]
- National Natural Science Foundation of China [61307126, 11174207, 61138001, 61007059, 61205094]
- Leading Academic Discipline Project of Shanghai Municipal Government [S30502]
- Scientific Research Innovation Project of Shanghai Municipal Education Commission [14YZ093]
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Based on composite optical transformation, we propose a rotatable illusion media with positive permittivity and permeability to manipulate terahertz waves, and a new way to realize singular parameter-independent cloaks when the incident wave with a certain width propagates from specific incident directions. The fundamental mechanism of this kind of cloak is that the illusion media can be able to avoid the incident wave interacting with the objects. Comparing with traditional transformation-coordinate-based cloaks such as cylindrical-shaped cloaks, our cloaks are independent of singular material parameters. Furthermore, this type of rotatable illusion media can be applied to design tunable miniaturized high-directivity antenna (a small antenna array covered with the rotatable illusion media appears like a large one and meanwhile, the radiation directions of the small antenna array is tunable via this rotatable illusion media). Full wave simulations are performed to confirm these points. (C) 2013 Optical Society of America
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