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Free-space carpet cloak using transformation optics and graphene
Optics Letters
|December 10, 2014
Summary
Researchers developed a novel free-space carpet cloak using layered graphene. This graphene-based cloak can render objects invisible at terahertz (THz) frequencies and its operating frequency is tunable.
Area of Science:
- Metamaterials and Nanophotonics
- Plasmonics and Graphene Applications
Background:
- Transformation optics cloaking requires materials with anisotropic and plasma-like properties, which are rare in nature.
- Graphene, a 2D material, exhibits natural anisotropic plasma-like behavior and high electron mobility, making it a promising candidate for cloaking applications.
Purpose of the Study:
- To theoretically propose and demonstrate a novel free-space carpet cloak utilizing periodically stacked layered graphene.
- To investigate the cloaking performance of the proposed graphene-based carpet cloak in the terahertz (THz) frequency range.
Main Methods:
- Theoretical proposal of a free-space carpet cloak structure using layered graphene.
- Electromagnetic simulations to evaluate the invisibility performance of the designed cloak.
Main Results:
- The proposed graphene-based carpet cloak successfully renders an object invisible in the THz frequencies.
- The cloak's working frequency is continuously tunable across a wide spectrum due to graphene's tunable conductivity.
Conclusions:
- Periodically stacking layered graphene offers a viable approach for designing effective free-space carpet cloaks.
- The tunability of graphene's conductivity provides a unique advantage for developing broadband and reconfigurable cloaking devices.
