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.
KeywordsFocal Plane Silver Film Radial Symmetry Circular Waveguide Azimuthal Mode
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- 11.A. Taflove, S.C. Hagness, Computational Electrodynamics. The Finite Difference Time-Domain Method (Artech House, Norwood, MA, 2005), pp. 132–133Google Scholar