Figure 2 | Scientific Reports

Figure 2

From: Going far beyond the near-field diffraction limit via plasmonic cavity lens with high spatial frequency spectrum off-axis illumination

Figure 2

Imaging contrast as a function of the air distance (L) and half-pitch size of dense-line object for (a) the near-field imaging under normal incidence (NI, kx,inc = 0), (b) the superlens under NI, (c) the plasmonic cavity lens under NI and (d) the plasmonic cavity lens under high spatial frequency spectrum OAI (kx,inc = 1.5 k0) from two sides.

The contrast contours of 0.4 are denoted by the black curves in (a–d). The white curves in (b–d) are replications of the black contour in (a), corresponding to the limit of the conventional near-field imaging. The red dashed curve in (d) corresponds to the results of the approximate model of Eq. 2 in the text. (e) Calculated maximum air distance for the four imaging schemes.

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