That sounds like you have not completely stripped the photoresist
which can happen if you do liftoff with acetone.  I suggest doing an
oxygen plasma for a minute or two and see if your non patterend area
clears up.

Nicolas Duarte
PhD Candidate under Dr Srinivas Tadigadapa
Electrical Engineering
The Pennsylvania State University

At 3:29 PM -0700 3/9/07, yitianp@email.arizona.edu wrote:
>I have lift-off the gold on photoresist.
>But some part of the pattern is very clear,but other area is not.
>What reason can cause the phenomena?????