Patent ID: 7648808
Filing Date: 2010-01-19
Classification: G02B

Abstract:
1. A method for manufacturing a patterned coated dichroic filter, comprising the steps of: a. cleaning a wafer; b. applying a photoresist to said wafer; c. masking pre-selected areas of said photoresist; d. developing unmasked areas of said photoresist to create a pre-selected space on a predetermined section of said wafer; e. over-developing said photoresist layer to form an undercut in said photoresist layer and to expose said predetermined section of said wafer; f. depositing dichroic filter material on said predetermined section of said wafer; g. removing said photoresist; h. repeating the foregoing steps if required to deposit a predetermined number of dichroic filters on said wafer in a predetermined array; and, i. depositing a blanket coating of a material to the wafer such that the combination of dichroic filter material and blanket coating meet the desired spectral properties of the patterned coated dichroic filter.