Abstract
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.
Highlights
We theoretically demonstrated that all-angle negative refraction and imaging can be implemented by metallic nanowires embedded in a dielectric matrix
Negative refraction and superlensing have been extensively studied in negative-index metamaterials (NIMs) and photonic crystals (PCs) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
In this paper we study and design a bulk indefinite material composed of aligned arrays of metallic nanowires in a dielectric matrix, to implement all-angle negative refraction over a broad band in the optical frequency region
Summary
Negative refraction and superlensing have been extensively studied in negative-index metamaterials (NIMs) and photonic crystals (PCs) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. Pendry has further extended this concept, showing that a flat slab of NIMs can make a perfect lens for sub-diffraction-limited imaging [2] Such a superlens has been implemented by a silver film with the properly designed thickness and working wavelength [3,4]. In this paper we study and design a bulk indefinite material composed of aligned arrays of metallic nanowires in a dielectric matrix, to implement all-angle negative refraction over a broad band in the optical frequency region. Such negative diffraction is not sensitive to the azimuthal angle, nanowire arrangement or geometry imperfection. There is a very broad spectral region (from visible to infrared) satisfying ε // ⋅ ε ⊥ < 0 , which is critical for negative refraction and imaging as discussed in the following text
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