Patent ID: 9733574
Date: 2017-08-15
CPC Classifications: G03F

Claim:
1. A photomask, comprising: a first area including a plurality of first protrusions formed in a surface of a substrate and having a first depth configured to shift a phase of first light incident thereon by a predetermined first phase angle, and to transmit the shifted first light; and a second area including a plurality of second protrusions formed in the surface of the substrate configured to shift a phase of second light incident thereon by a predetermined second phase angle different from the first phase angle, and to transmit the shifted second light, an absorber is disposed solely on distal end surfaces of the first protrusions and the second protrusions, wherein the absorber is configured to transmit the light transmitted through the first and second protrusions with a transmittance of not greater than 8%, and to shift a phase of light transmitted through the absorber by a phase angle of 180 degrees.