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Scanning electron images of random (a) rectangular and (b) RCA array are shown together with periodic arrays of (c) rectangular and (d) RCA arrays.
The transmisivity spectra for the (a) random and (b) periodic arrays of rectangular (blue) and RCA (red) nanoapertures are shown. Inset shows the periodicity dependence of the resonance peak for RA array.
Dominant field profiles for the rectangular and RCA nanoapertures are shown (a) at metal/silicon interface, (b) in the middle of the nanoaperture, (c) at metal/air interface, and (d) 30 nm in air.
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