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Subwavelength apertures studied: The C aperture, same-area square, same-area rectangle, and square aperture modeled to produce the same near field spot size.
(Color) Photograph taken through microscope eyepiece of the entire sample under (a) horizontal and (b) vertical polarization. SEM images of example apertures are shown at the left. Each group of three rows was fabricated with the same shape.
Transmission spectra of C aperture (dashed-line), same-area square (solid-line) aperture, and rectangular aperture (dotted-line) normalized to lamp spectrum.
(a) The relationship between resonance wavelength and aperture size is shown for the rectangular (triangles), and the C apertures (diamonds), and compared to FDTD calculations (dashed and solid lines, respectively). (b) The individual C-aperture spectra ( through ).
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