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(a) A schematic illustration of a one-dimensional periodic array of subwavelength slits perforated in an ultrathin metal film on a quartz wafer, where the thickness of the film is , the width of the slits is , and the period of the slit array is . Axis shows the propagation direction and polarization of the incident plane wave. (b) Scanning electron microscope image of its corresponding structure. (c) Free-space measurement setup.
Transmittance spectra for the closed (a) and perforated (b) ultrathin gold film at normal incidence. The solid lines correspond to the experimental results and the dashed lines are the results from numerical analysis. Insets show the polarization of the electric field for the incident waves.
Transmittance (a) and reflectance (b) spectra when varying the gap for . Transmittance (c) and reflectance (d) spectra as a function of the periodicity of the structured film for .
Measured transmittance spectra of the perforated film when varying angles of polarization .
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