Light diffraction by a subwavelength circular aperture

✍ Scribed by Che-Wei Chang; A. K. Sarychev; V. M. Shalaev

• Book ID: 102443935
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 156 KB
• Volume: 2
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200510006

✦ Synopsis

Diffraction of normally incident light by a
subwavelength circular aperture is calculated analytically. The
aperture is opened on a perfectly conducting planar screen with
infinitesimal thickness. In our model, the aperture is replaced by
uniform magnetic currents and charges. The model allows one to
obtain the normalized cross section for the aperture radius up to
half of the wavelength, which exceeds the 0.2 wavelength limit of
the Bethe-Bouwkamp's dipole model
[1-3]. Also, in addition to
reproducing the (ka)^4^ dependence, which is characteristic of
the dipole mode, our uniform field model explains the transmission
enhancement obtained in Abajo's numerical simulation
[4].