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[(a) and (b)] NSOM image of the silver SAA structure at incident wavelength (the yellow arrow indicates the direction of the incident polarization). (c) Line profile of interference fringes near the center of the silver ring.
(a) NSOM collection mode images of transmitted light at different cross sections away from the focal point (scale bar is ). (b) Transmitted intensity as a function of the radial distance at different cross sections above the silver SAA structure as measured by the NSOM. [Note that inset figures show the normalized intensity of the central spot and FWHM of the central spot as a function of the distance to the focal point .]
SAA structures with different diameters and its intensity of the central spot at different heights.
FDTD simulation results of a silver SAA structure. (a) cross section intensity map at above surface. (b) Intensity distribution of the focusing spot along the plane. (c) Intensity distribution of the focusing spot along the plane.
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