Abstract

The power emitted by a dipole at the interface between an indefinite (hyperbolic) medium and an isotropic medium is analyzed. The theoretical estimation is performed by using a transmission line method for time-harmonic fields in layered isotropic materials. The indefinite medium can be constructed in different ways; here we analyze, as an example, the case of alternating two subwavelength layers of isotropic materials. We compute the power spectrum of transverse electric and magnetic (TE and TM) waves and show that the power emitted by the dipole is mainly coupled into the indefinite medium underneath, opening up several application scenarios, such as innovative carpet cloaking implementations and super absorbers.

Highlights

  • An indefinite medium (IM) is an anisotropic medium characterized by permittivity and/or permeability tensors that provide with a different response, according to the polarization of the field, resulting in a hyperbolic-like dispersion diagram [1].One of the recent usages of indefinite (hyperbolic) medium (IM) shows that such media allow for subwavelength focusing of the field, useful for lensing applications [2,3,4,5]

  • We focus on determining the power spectrum of TE/TM waves of a dipole at the interface between an IM and an isotropic medium, aiming at showing that most of the emitted power is coupled inside the IM

  • We use the transmission line (TL) formalism to compute the power emitted by an elementary dipole just above or at the interface between free space and IM

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Summary

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Hiding and Absorbing the Power Emitted by a Dipole at the Interface of an Indefinite Medium. Abstract—The power emitted by a dipole at the interface between an indefinite (hyperbolic) medium and an isotropic medium is analyzed. The theoretical estimation is performed by using a transmission line method for time-harmonic fields in layered isotropic materials. The indefinite medium can be constructed in different ways; here we analyze, as an example, the case of alternating two subwavelength layers of isotropic materials. We compute the power spectrum of transverse electric and magnetic (TE and TM) waves and show that the power emitted by the dipole is mainly coupled into the indefinite medium underneath, opening up several application scenarios, such as innovative carpet cloaking implementations and super absorbers

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