, Volume 89, Issue 4, pp 517-520
Date: 27 Nov 2007

Waveguide properties of single subwavelength holes demonstrated with radially and azimuthally polarized light

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We investigate the transmission of focused beams through single subwavelength holes in a silver film. We use radially and azimuthally polarized light to excite higher-order waveguide modes as well as to match the radial symmetry of the aperture geometry. Remarkably, the transmission properties can be described by a classical waveguide model even for thicknesses of the silver film as thin as a quarter of a wavelength.


42.25.Bs; 42.25.Ja; 42.79.Gn