Waveguide properties of single subwavelength holes demonstrated with radially and azimuthally polarized light
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- Kindler (née Müller), J., Banzer, P., Quabis, S. et al. Appl. Phys. B (2007) 89: 517. doi:10.1007/s00340-007-2874-5
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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.