Wideband and multi-frequency infrared cloaking of spherical objects by using the graphene-based metasurface
| Autor: | Mohammad Danaeifar, Elnaz Shokati, Nosrat Granpayeh |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Permittivity
Materials science Materials Science (miscellaneous) Physics::Optics Cloaking 02 engineering and technology Dielectric Theories of cloaking 01 natural sciences Industrial and Manufacturing Engineering law.invention 010309 optics Optics law 0103 physical sciences Physics::Atomic and Molecular Clusters Business and International Management Wideband Transformation optics business.industry Graphene Cloak 021001 nanoscience & nanotechnology Optoelectronics 0210 nano-technology business |
| Zdroj: | Applied Optics. 56:3053 |
| ISSN: | 1539-4522 0003-6935 |
| DOI: | 10.1364/ao.56.003053 |
| Popis: | The ultrathin graphene metasurface is proposed as a mantle cloak to achieve wideband tunable scattering reduction around the spherical (three-dimensional) objects. The cloaking shell over the metallic or dielectric sphere is structured by a periodic array of graphene nanodisks that operate at infrared frequencies. By using the polarizability of the graphene nanodisks and equivalent conductivity method, the metasurface reactance is obtained. To achieve the cloaking shell for both dielectric and conducting spheres, the metasurface reactance as a function of nanodisks dimensions, graphene's Fermi energy, and permittivity of the surrounding areas can be tuned from the inductive to capacitive situation. Inhomogeneous metasurfaces including graphene nanodisks with different radii provide wideband invisibility due to extra resonances. We could significantly increase the 3-dB bandwidth more than the homogenous case by simpler realistic designs compared to the multi-layer structures. The analytical results are confirmed with full-wave numerical simulations. |
| Databáze: | OpenAIRE |
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