Patent ID: 7572656

Claim:
A method for fabricating a device, comprising: providing a substrate; forming a plurality of thin films on the substrate; forming a photoresistable layer on the plurality of thin films; irradiating light onto the photoresistable layer through a photo mask having a transmissive region, a half-transmissive region, a diffractive region and an interceptive region; developing the photoresistable layer to form a photoresist pattern having at least three different thicknesses; etching the plurality of thin films using the photoresist pattern; first ashing the photoresist pattern and etching the plurality of thin films using the first ashed photoresist pattern; and second ashing the first ashed photoresist pattern and etching at least one thin film of the plurality of thin films using the second ashed photoresist pattern; wherein the interceptive region includes metal layer, the half-transmissive region includes an optical absorption layer, and the diffractive region includes the optical absorption layer and a plurality of slits of metal layer.