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Optical constants of Negative tone photoresists
Microchem SU-8 2000
(0.32 – 0.8)
Complex refractive index (n+ik)
Derived optical constants
Microchem SU-8 2000 permanent epoxy negative photoresist. Uncured.
Microchem SU-8 2000 Data Sheet, 2011
In semiconductor fabrication, a resist is a thin layer used to transfer a circuit pattern to the semiconductor substrate which it is deposited upon. (from Wikipedia)