S. Anantha Ramakrishna's Physics and Applications of Negative Refractive Index PDF
By S. Anantha Ramakrishna
Ever because the first experimental demonstration used to be mentioned in 2000, the curiosity in metamaterials and left-handed media that show a unfavourable refractive index has elevated exponentially. Surveying this explosive development, Physics and purposes of detrimental Refractive Index Materials covers the elemental actual ideas and rising engineering functions of based electromagnetic metamaterials that yield a damaging refraction in addition to different unforeseen actual homes. It presents specified factors at the historical past, improvement, and major achievements of metamaterials.
Making it effortless to entry correct, updated details at the box, the authors assemble an important and influential papers on the topic of metamaterials. They current the rules of unfavourable refraction and evaluate the individuality of novel metamaterials with different media that convey comparable houses. The ebook discusses the layout, optimization, and trying out of established metamaterials in addition to purposes of metamaterials at frequencies starting from radio wave to optical. It additionally explores novel thoughts and phenomena, resembling the suitable lens for super-resolution imaging, hyper lenses that couple the near-field to radiative modes, electromagnetic cloaking and invisibility, and near-field optical imaging.
Connecting theoretical rules to fresh experimental concepts and effects, this state of the art publication allows an figuring out of the elemental ideas of and learn contributions to metamaterials with adverse refractive index and their electromagnetic properties.
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Additional resources for Physics and Applications of Negative Refractive Index Materials
Eqs. 9) indicate that the real and imaginary parts of the permittivity (and similarly the permeability) are Hilbert transforms of each other, as illustrated in Fig. 8. These relations are derived for material media in thermodynamic equilibrium solely on the grounds of causality. The restriction that they provide on the variation in the real and imaginary parts of material parameters should be regarded as very fundamental. The Kramers-Kronig relations allow an experimentalist, for example, to measure the imaginary part of the permittivity easily by absorption experiments at various frequencies and deduce the real parts of the dielectric permittivity from the imaginary part.
Upon averaging in macroscopic measurements, the only remaining important parameters are the frequency-dependent polarization of the individual (atomic or molecular) oscillators driven by the applied ﬁelds. We can apply this idea to a higher class of inhomogeneous materials, such as metamaterials, where the inhomogeneities in a host background are much smaller than the wavelength of radiation, but yet much larger than the “atoms” or “molecules” that the material is composed of. Such a meso-structure would also not be resolved by the incident radiation, and the structure could be driven and polarized or magnetized by applied electromagnetic ﬁelds.
The wavy lines represent materials that allow propagating waves, and the axes set in quadrants 1 and 3 show the right and left-handed nature of E, H, k vectors. The waves in quadrants 2 and 4 decay evanescently inside the materials and are schematically depicted. (Reproduced with permission from Ramakrishna (2005). ) chiral materials, or even with the polarization state of an electromagnetic wave (right-handed or left-handed circularly polarized). In the frame of this book, however, chirality is only brieﬂy mentioned when necessary, and therefore such confusion is very unlikely.
Physics and Applications of Negative Refractive Index Materials by S. Anantha Ramakrishna