Non-radiating and radiating configurations driven by left-handed metamaterials

Abstract

It is shown that a pair of identical emitters (e.g. wire dipole antennas) in the focal points of a disc, made of left-handed metamaterial (a "perfect" lens), form a non-radiating electromagnetic configuration. The emitters are fed with voltages of equal magnitude and pi-out-of-phase. Detailed finite-difference time-domain (FDTD) modeling shows that there are non-propagating electromagnetic fields generated - fields that remain confined within the region between the emitters and the lens. The energy balance of the system shows that the radiation resistance of the system is very low. This means that the input power is converted to heat in the volume of the lens and only a small fraction of it is radiated. The system performance shows that disturbing the configuration of the non-propagating electromagnetic fields with the presence of an externally introduced object stimulates radiation. This suggests possible detector applications. In-phase feeding voltages are also studied with the consequence that the radiation resistance of the antennae is increased.

27 pages, 7 figures, accepted for publication in JOSA B

References in corpus (4)

• Finite-size effects of a left-handed material slab on the image quality
• Subwavelength imaging by a left-handed material superlens
• Negative Refraction in Perspective
• Dispersion properties of non-radiating configurations: Finite-Difference Time-Domain modeling

Cited by in corpus (7)

• Solutions in folded geometries, and associated cloaking due to anomalous resonance
• Electromagnetic energy in a dispersive metamaterial
• Opaque perfect lenses
• Electron Beam Instability in Left-Handed Media
• Spectral theory of a Neumann-Poincaré-type operator and analysis of anomalous localized resonance II
• Radiation enhancement and radiation suppression by a left-handed metamaterial
• Localization of electric field distribution in graded core-shell metamaterials