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Decibel scale near-field distribution of electric field strength of (a) component and (b) component through the -shaped ridge aperture in chromium film, and (c) component and (d) component in silver film on the plane at . The inset of (a) shows the geometry of the ridge aperture. -polarized illumination at is normally incident from substrate side with electric field strength of unity in air.
Decibel scale near-field distribution in the vicinity of the -shaped ridge aperture in silver at (a) entrance plane (silver–quartz interface) and (b) exit plane (silver–air interface). The incident electric field is polarized with strength of unity in air.
Normalized field intensity distribution at a distance below a bowtie aperture in (a) silver film with excitation, (b) silver film with excitation; and (c) chromium film with excitation. The insets show (a) the geometry of the bowtie tips and (b) the spectrum response of the bowtie aperture in silver.
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