I. S. Nefedov

Publications (2)0.61 Total impact

• Article: Strong field localization in subwavelength metal-dielectric optical waveguides

  O. N. Kozina, L. A. Mel’nikov, I. S. Nefedov
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  ABSTRACT: Detailed calculations of eigenmodes of waveguiding structures made of silver and glass and containing coaxial cables with a nanoscale cross section of different configurations are conducted. In particular, the study focuses on optical coaxial waveguides with the core made in the form of a thin metallic cylinder filled with a dielectric. We show that these waveguides support relatively low-loss propagation of radiation that is strongly localized in the central region, has phase velocity approaching the speed of light and predominant electric-field orientation (dipole type). Optical characteristics of such waveguides are compared with those of coaxial-type waveguides containing a continuous central filament made of metal and with a multilayer structure. Using numeric modeling, we established that the proposed type of the waveguide enables the transmission of an optical image with relatively low losses with a submicron resolution over a distance considerably longer than its cross section. A typical propagation length in the waveguides based on silver and glass with the refractive index of about 1.5 at a wavelength of 500 nm is about 1700 nm.
  Optics and Spectroscopy 05/2012; 111(2):241-247. · 0.61 Impact Factor
• Source

  Available from: metamorphose-vi.org

  Article: Fast dipole modes in metal-dielectric optical nanocables

  O N Kozina, L A Melnikov, A Soloviev, I S Nefedov
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  ABSTRACT: In this presentation we propose new optical waveguides, made of glasses and noble metals. Such waveguides are like coaxial cables where inner metal rods are replaced by thin metal annuluses filled with a glass inside. Nu-merical simulations demonstrate that the proposed waveguide, having nanosize cross-section, supports propaga-tion of modes, which phase velocity is close to the speed of light and which field is localized outside the metal. These modes are dipole-like modes and are characterized by comparatively low losses.