An adaptive finite element method for full three dimensional simulations is used combined with the Taguchi method for optimization, for designing and optimizing an on-chip single- mode photon to surface plasmon coupler.
G. Kewes, et al. Design and numerical optimization of an easy-to-fabricate photon-to-plasmon coupler for quantum plasmonics. Appl. Phys. Lett. 102, 051104 (2013).