Читать книгу Introduction To Modern Planar Transmission Lines - Anand K. Verma - Страница 243

The anisotropic DNG medium‐based hyperlens converts the evanescent waves to the propagating waves by reducing the values of the transverse wavenumber below the wavenumber in the medium. It is realized by the hyperbolic dispersion relation of the uniaxial anisotropic medium discussed in section (4.7.5) of chapter 4. Thus, a hyperlens projects the high‐resolution image in the far‐field region. It is shown in Fig (5.12d). The hyperlens has been realized in the cylindrical geometry using very thin alternate curved layers of conducting and dielectric films. The object is placed at the center and the propagating waves are available at the flat end of the cylindrical medium in which the hyperlens is embedded. The normal optical lens, attached with the hyperlens, carries out the optical processing to create the high‐resolution image in the far‐field region [J.17, J.18].