Metal heterowaveguides for nanometric focusing of light

Bing Wang; Guo Ping Wang
October 2004
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3599
Academic Journal
Based on the different propagation characteristics of surface plasmon polaritons (SPPs) excited on different metallic surfaces and on the tendency of SPPs to the region in which SPPs possess lower phase velocity, we design a kind of metal heterowaveguide for nanometric focusing of light. Finite-difference time-domain simulations demonstrate that, by converting light into SPPs, such heterowaveguides constructed with both Ag and Al can focus incident light into about a 20 nm×30 nm (λ/27×λ/18≈0.002λ2) domain with higher than 15% coupling efficiency.


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