A process for patterning dielectric layers of the type typically found in optical coatings in the context of MEMS manufacturing is disclosed. The polymers include homopolymers, random copolypeptides, block copolypeptides, block copolymers with at least one peptidyl block, grafted copolypeptides, and polypetidyl dendrimers. A tremolo arm has an engagement section with a flat engagement surface that defines a plane substantially parallel to a longitudinal axis of the engagement section. Using the lossless characteristics of the communication channel, the derived input signal and the sampled output signal, a value indicating the contribution of intersymbol interference jitter effect on timing skew budget for a selection communication channel may be obtained. The present invention also relates to a method for treatment by fumigation using said photocatalytic film and at least one fumigant.