This article is cited in 2 papers

Waveguides. Optical fibres

Transmission of evanescent modes through a subwavelength aperture of a cylindrical waveguide. 2. The influence of dielectric properties of a real metal

T. I. Kuznetsova^a, V. S. Lebedev<sup>ab

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^b Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moskovskaya obl.

Abstract: The transmission of an evanescent light wave through the subwavelength aperture of a dielectric cylindrical metal-coated waveguide is studied. The theoretical approach to the description of the field structure in such a nanowaveguide is developed, which takes into account the transformation of the initial wave reflected from the output aperture and proves applicable when dielectric properties of a real metal are taken into account. The complex reflection coefficient of a supercritical waveguide mode from the aperture, the complex light flow and the far-field transmission coefficient are calculated for an aluminium-coated waveguide at the light wavelength of λ = 488 nm. It is established that the reflection and transmission coefficients of the nanowaveguide strongly depend on the dielectric constant of its core and differ significantly for transverse-magnetic and transverse-electric modes. It is demonstrated that the characteristics of light fields under study differ essentially from those of a nanowaveguide with ideally conducting walls and the subwavelength aperture in a perfectly conducting screen.

PACS: 42.81.Dp, 42.81.Qb, 78.67.Ch

Received: 12.08.2008

 English version: Quantum Electronics, 2009, 39:6, 575–582

Bibliographic databases:

• 
• 
• 
•