Patent ID: 8148264

Claim:
A method for fabricating high aspect ratio pillars comprising: providing a substrate; coating the substrate by a resist; defining the high aspect ratio pillars by patterning and exposing the resist; developing the resist to remove portions of the resist on the substrate, to expose portions of the substrate; depositing an etch mask on the resist and the exposed portions of the substrate; placing the resist in a chemical bath to dissolve the resist and the etch mask on the resist, such that the etch mask on the substrate remain undissolved; etching sections of the substrate exposed as a consequence of dissolving the resist and the etch mask on the resist, the etching being performed with an SF 6 /O 2 cryogenic etch to fabricate high aspect ratio micropillars and a Pseudo Bosch etch to fabricate high aspect ratio nanopillars; and removing a remainder of the etch mask to form the high aspect ratio pillars.