Figure 6. Schematic diagrams of the process sequence for the fabrication of
2D slab silicon photonic crystals using combined-nanoimprint-and-photolithography.
ICP-IRE, inductively coupled plasma reactive ion etcher. (a) PECVD SiO2 deposition
(100 nm) on SOI substrate with 2 um-thick buried oxide (BOX) layer, (b) Al thin layer
deposition (20 nm) on top of SiO2, (c) SU-8 spin-coat (230 nm) on Al layer,
(d) Combined-Nanoimprint-and-Photolithography, (e) SU-8 residue dry etch, (f) Al dry
etch, (g) SiO2 dry etch, and (h) silicon and SiO2 etch.