A frequency-tunable cloak with semiconducting constituents

A frequency-tunable cloak with semiconducting constituents has been proposed by modifying the dielectric constant by externally controlling the free-carrier density. We have theoretically studied that the cloaking frequency of a single-layer shell consisting of intrinsic InSb can be tuned by varying...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2010-05, Vol.43 (17), p.175404-175404
Main Authors: Li, Peining, Liu, Youwen, Meng, Yunji, Zhu, Mingjun
Format: Article
Language:English
Subjects:
Applied classical electromagnetism
Constituents
Density
Dielectric constant
Diffraction and scattering
Electromagnetic wave propagation, radiowave propagation
Electromagnetism
electron and ion optics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Germanium
Indium antimonides
Mathematical analysis
Optics
Physics
Semiconductors
Shells
Wave optics
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Summary:A frequency-tunable cloak with semiconducting constituents has been proposed by modifying the dielectric constant by externally controlling the free-carrier density. We have theoretically studied that the cloaking frequency of a single-layer shell consisting of intrinsic InSb can be tuned by varying the temperature based on the Mie scattering theory. The calculated results show that this tunable cloak has a large bandwidth of over 0.3 THz, a tunability of cloaking frequency of 17 GHz K-1 with temperature and a dramatic reduction in the total scattering cross section of 90% at cloaking frequencies. It is also possible to realize a tunable cloak of extrinsic semiconductor Ge by changing the impurity density with current injection.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/43/17/175404