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Optical setup for leakage radiation microscopy. O1 microscope objective for focussing the laser beam, S sample, O2 imaging microscope objective, BFP back focal plane, LR leakage radiation, L1 to L4 auxiliary lenses, BB beam blocker, CCD charge coupled device image sensor. The inset shows a SEM image of a hole pair in an 80 nm thick gold film.
LRM images of a hole pair aligned along the horizontal direction in a 80 nm thick gold film. The centre-to-centre hole distance is 1600 nm. The polarization direction of the incident laser beam is (a) parallel and (b) normal to the pair axis.
Back focal plane images of a single hole for (a) horizontal and (b)vertical polarization direction. (c), (d) The corresponding images for a horizontally aligned hole pair. Polarization directions are indicated by double-sided arrows. All holes measure 250 nm in diameter, the hole distance is 1600 nm. Image contrast is optimized for best visibility of the interference pattern. The inset at the bottom highlights the respective features in the images. SPP-ring bright circular zone caused by leakage radiation.
Measured normalized SPP power vs. normalized hole distance for polarization directions of the incident light (a) parallel to the pair axis and (b) normal to the pair axis (symbols). The full lines show the theoretical calculations.
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