Power scattering and absorption mediated by cloak/anti-cloak interactions: A transformation-optics route towards invisible sensors

Abstract

The suggestive idea of "cloaking" an electromagnetic sensor, i.e., strongly reducing its visibility (scattering) while maintaining its field-sensing (absorption) capabilities, has recently been proposed in the literature, based on scattering-cancellation, Fano-resonance, or transformation-optics approaches. In this paper, we explore an alternative, transformation-optics-based route, which relies on the recently-introduced concept of "anti-cloaking." More specifically, our proposed approach relies on a suitable tailoring of the competing cloaking and anti-cloaking mechanisms, interacting in a two-dimensional cylindrical scenario. Via analytical and parametric studies, we illustrate the underlying phenomenology, identify the critical design parameters, and address the relevant optimality and tradeoff issues, taking also into account the effect of material losses. Our results confirm the envisaged potentials of the proposed transformation-optics approach as an attractive alternative route to sensor cloaking.

21 pages, 10 figures

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• Physical Bounds on Absorption and Scattering for Cloaked Sensors
• Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid
• Furtive Quantum Sensing Using Matter-Wave Cloaks
• Analytical study of spherical cloak/anti-cloak interactions
• On the active manipulation of quasistatic fields and its applications
• On the active manipulation of EM fields in open waveguides