Transformation optics

About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.

Hybridization of optical plasmonics with terahertz metamaterials to create multi-spectral filters.

Abstract: Multi-spectral imaging systems typically require the cumbersome integration of disparate filtering materials in order to work simultaneously in multiple spectral regions. We show for the first time how a single nano-patterned metal film can be used to filter multi-spectral content from the visible, near infrared and terahertz bands by hybridizing plasmonics and metamaterials. Plasmonic structures are well-suited to the visible band owing to the resonant dielectric properties of metals, whereas metamaterials are preferable at terahertz frequencies where metal conductivity is high. We present the simulated and experimental characteristics of our new hybrid synthetic multi-spectral material filters and demonstrate the independence of the metamaterial and plasmonic responses with respect to each other.

Towards left-handed metamaterials using single-size dielectric resonators: The case of TiO2-disks at millimeter wavelengths

Abstract: We report a strong magnetic activity using an all-dielectric metamaterial based on Mie resonances, designed to work at millimeter wavelengths over the 30–70 GHz band A good agreement was achieved between numerical simulations and experiment in the case of one meta-layer based on TiO2-disks, manufactured using a simple bottom-up approach We also demonstrate through numerical simulations a negative refractive index within the same investigated metamaterial made of high dielectric permittivity single-size pellets Choosing the suitable aspect-ratio of the metamaterial building blocks, a broadband magnetic response and a left-handed behavior are simultaneously obtained This is a promising step towards innovative and complex electromagnetic functions, involving cheap and easy made metamaterials for millimeter wave applications

Overlapped optics, illusion optics, and an external cloak based on shifting media

Abstract: Based on optical transformation theory, an anistropic but homogeneous shifting medium is proposed to make multiple objects with the same shape appear as only one. Potential applications, e.g., enhancing the signal strength of current plane antennas and antenna arrays, are discussed in detail. Illusion optics, e.g., turning a spoon into a cup with an isotropic and homogeneous antiobject and a dielectric cup, is investigated. Such a homogeneous shifting medium can be extended to design an antiobject-independent external cloak. Finite element simulations for two-dimensional cases have been performed to demonstrate these properties.

Generalization of ray tracing in a linear inhomogeneous anisotropic medium: a coordinate-free approach.

Abstract: The Hamiltonian of an optical medium is important in both the design and the description of optical devices in the geometrical optics limit. The results calculated in this article show in detail how ray tracing in anisotropic materials in arbitrary coordinate systems and curved spaces can be carried out. Writing Maxwell’s equations in the most general form, we derive a coordinate-free form for the eikonal equation and hence the Hamiltonian of a general purpose medium. The expression works for both orthogonal and non-orthogonal coordinate systems, and we show how it can be simplified for biaxial and uniaxial media in orthogonal coordinate systems. In order to show the utility of the equations in a real case, we study both the isotropic and the uniaxially transmuted birefringent Eaton lens and derive the ray trajectories in spherical coordinates for each case.

Strange new tricks with light.

Abstract: In the past decade, physicists and engineers pioneered new ways to guide and manipulate light, creating lenses that defy the fundamental limit on the resolution of an ordinary lens and even constructing "cloaks" that make an object invisible—sort of. The feats sprang from a roughly 50–50 mixture of a new technology and one oh-so-clever idea. The technology was "metamaterials": assemblages of little rods, rings, and wires that act like materials with bizarre optical properties. The idea was transformation optics, a scheme that tells scientists how to tailor the properties of a metamaterial to achieve an effect like cloaking.