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(Color online) Illustration of the geometry.
(Color online) Readout contrast for one data pit (a) with and (b) without light side plasmon pits. Solid lines are for Ag and dotted lines are for Si data layer. The black dashed line indicates the position of the data pit.
(Color online) Field intensity distribution with and without light side plasmon pits: and . Plots on the left column and right column for Ag and Si data layers, respectively.
(Color online) Readout contrast for two data pits: (a) pit detection in Ag data layer and (b) pit detection (green) and edge detection (blue) in Si data layer. is the distance between the location midway of the two data pits and the subwavelength slit; the slit coincides with the data pit at , with (DPS: data pit separation). The solid lines show the results without light side plasmon pits [ not applicable (n.a.)]. The dashed lines indicate the respective positions of the data pits.
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