Figure 6.

Transmission efficiency. (a) Variation of the zero-order efficiency η0 (red line, left-hand scale) and the total transmission efficiency η (black line, right-hand scale) as a function of the Al film thickness h. (b) Angular dependence of transmission efficiency: surface corrugation optimized for SPP coupling (green line), the final design without (blue line) and with (black line) the TiO2 layers.

Rahomäki et al. Nanoscale Research Letters 2013 8:326   doi:10.1186/1556-276X-8-326
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