All-angle negative refraction and imaging in a bulk medium made of metallic nanowires in the visible region

NSF Nanoscale Science and Engineering Center, 5130 Etcheverry Hall, University of California, Berkeley, CA 94720-1740, USA.
Optics Express (Impact Factor: 3.49). 10/2008; 16(20):15439-48. DOI: 10.1364/OE.16.015439
Source: PubMed


We theoretically demonstrated that all-angle negative refraction and imaging can be implemented by metallic nanowires embedded in a dielectric matrix. When the separation between the nanowires is much smaller than the incident wavelength, these structures can be characterized as indefinite media, whose effective permittivities perpendicular and parallel to the wires are opposite in signs. Under this condition, the dispersion diagram is hyperbolic for transverse magnetic waves propagating in the nanowire system, thereby exhibiting all-angle negative refraction. Such indefinite media can operate over a broad frequency range (visible to near-infrared) far from any resonances, thus they offer an effective way to manipulate light propagation in bulk media with low losses, allowing potential applications in photonic devices.

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    • "9 r k x z , ( ) ( ) ( ) q = And the angle of refraction for the poynting vector can be obtained as, k k k k tan Re Re 10 r s xx x zx z z zz x xz , ( ) ( ) ( ) q e e e e = - (see supplementary information for the details of theoretical derivations). For x x y y z z 0 , , , ( ) j = = ¢ = ¢ = ¢ 0 zx xz e e = = and equation (10) reduces to the most familiar form [4, 5] for uniaxial metamaterials k k tan Re Re . 1 1 r s xx x z zz , ( ) ( ) ( ) q e e = For HMMs: 0. xx zz e e < As a result, negative refraction can be achieved [4] [5] "

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    • "It should be noted that the mechanism of partial focusing in the proposed flat lens is somewhat similar to Fig. 1. 3-D geometry of a wire medium periodically loaded with metallic patches and lumped loads at the center (along the direction of the wires) excited by an obliquely incident TM-polarized plane wave. that achieved in a flat slab of indefinite anisotropic material [9], [10]. The analysis is carried out using the homogenization models (nonlocal and continuous material) developed for the WM with the generalized additional boundary conditions (GABC) derived in a quasi-static approximation by including arbitrary junctions with impedance insertions (as lumped loads) [5], [11]. "

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    • "defined in the literature as uniaxial media whose permittivity tensor has the axial and transversal components of the opposite signs (more exactly, the real parts of these components have opposite signs) [3] [4] [5] [6] [7]. "
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    ABSTRACT: We theoretically demonstrate that there is an angle of incidence and frequency at which a p-polarized electromagnetic wave can be perfectly absorbed without reflection by a half-space of lossy indefinite anisotropic medium. We show that this perfect absorption occurs when the Zenneck wave guided by a surface of indefinite medium transits to a homogenous plane wave. This angular and frequency selectivity of the absorption can find a use for photovoltaic systems.
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