Abstract
In this paper, a flat and incident angle independence absorbing material is proposed and numerically verified in the optical spectrum. A homogeneous and anisotropic dielectric slab as a non-reflecting layer is first reviewed, and a feasible realization strategy of the slab is then given by using layered isotropic materials. When the loss components of the constitutive materials are not zero, the slab will work as an angle insensitive absorbing layer, and the absorption rate augments with increase of the losses. As the numerical verifications, the field distributions of a metallic cylinder and a triangular metallic object individually covered by the designed absorbing layer are demonstrated. The simulation results show that the designed absorbing layer can efficiently absorb the incident waves with the property of incident angle independence at the operation frequency. This homogeneous slab can be used in one and two dimensional situations for the realization of an invisibility cloak, a carpet cloak and even a skin cloak, if it is used to conformally cover target objects.
Highlights
To 96% at the designed operation frequency
In Ref. 9, Mei and co-authors presented a nonmagnetic EM transparent wall (EMTW) with the property of incident-angleindependence based on the principle of total transmission and phase compensation
At the predesigned optical frequency for arbitrary incident angles smaller than 60◦, the propagated waves are initially guided into the slab with minor reflection below 20 dB and gradually attenuated during their propagation, and the absorption is more than 80% in the same angular range
Summary
With the condition of impedance matching, all the incident EM waves that are effectively guided into the material without reflection have the possibility to be efficiently absorbed inside the lossy material. In this regard, various flat non-reflecting coatings like the EM transparent wall (EMTW) previously proposed are ideal candidates for constructing EM absorbers.[9,10] In Ref. 9, Mei and co-authors presented a nonmagnetic EMTW with the property of incident-angleindependence based on the principle of total transmission and phase compensation. Phase compensation, which does not affect the absorption performance, can be eliminated from the original design, leading to a much simpler design From this point, in this letter, we proposed a conformal absorbing carpet using a homogeneous and anisotropic slab. In order to verify the design further, a metallic cylinder in vacuum and a triangular object on the ground is covered by the designed absorbing carpet, and the corresponding simulation results show that the proposed carpet can greatly reduce the backward scattering
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