Fig. 3
(Reprinted with permission from Ref. [54])
Theoretical conversion efficiency curves for slot waveguides for a Si3N4 core with λ0 = 785 nm, b TiO2 core with λ0 = 1064 nm, c silicon core with λ0 = 1550 nm. The solid lines: TE polarized excitation and collection. Dashed lines: TM polarized excitation and collection. Green, magenta and red lines are respectively for slot width of 150 nm, 50 nm and 10 nm. Only the curve segments corresponding to single mode operation from the cut-off width are shown.