Figure 2

Type II buried optical waveguides in diamond.

Transverse microscope view of type II waveguide in diamond along with near field mode profile (λ = 635 nm). An arrow indicates the position of the mode. (a) Pair of lines, horizontally separated by 13 μm. Modes could be coupled into three different vertical positions with the lowest loss mode shown (MFD 10 μm × 11 μm). (b) Pair of lines, horizontally separated by 13 μm along with second pair of lines for vertical confinement. Only a single mode could be coupled to the four-line modification (MFD 9 μm × 10 μm). All tracks were written with 50 mW, 0.5 mm/s at 500 kHz with deeper tracks more elongated due to increased spherical aberration.