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(a) Spatial dimensions of a slot antenna on a finite substrate. (b) (Normalized-to-area transmitted) field (amplitude) enhancements of diverse widths of slot antennas in free space with fixed length and thickness , calculated with a modal expansion model for PEC.
(a) Three-dimensional FDTD simulations of field enhancements of a width slot antenna on diverse thickness of SiN substrate. (b) Resonance frequency shift in a and a 150 nm width slot antenna as a function of the SiN substrate thickness.
(a) SEM image of a slot antenna with the length of and the width of about 150 nm. (b) Schematic of our experimental method.
(a) Normalized (transmitted) amplitude spectra measured through slot antennas with length , and different widths (, 500 nm, , , and ) on the thick SiN substrate. (b) The same as (a) but with a thick Si substrate. (c) The FDTD simulations for SiN, and (d) for Si substrate.
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