Patent ID: 8236481
Filing Date: 2012-08-07
Classification: G02B,G03F

Abstract:
1. A method of forming a turning mirror in a planar substrate defining a substrate plane, the method comprising: depositing a resist layer on the substrate, the resist layer having a first sensitivity to electrons and a second sensitivity to UV radiation, the second sensitivity being opposite in sign to the first sensitivity; exposing a portion of the resist layer to an electron beam to form an exposed portion of the resist layer, an electron dose of the electron beam being varied according to a selected pattern such that the electron dose applied to each region in the resist layer corresponds to a desired resist layer thickness of the region after a subsequent developing process; exposing the exposed portion of the resist layer to UV radiation; developing at least the exposed portion the resist layer to form an angled resist surface in the resist layer, the angled resist surface having a first angle relative to the substrate plane; and etching the substrate and the resist layer to form an angled reflecting surface in the substrate, the angled reflecting surface having a second angle relative to the substrate plane.