If you are using a normal exposure to define a square the corners get
exposed from both sides and the corners start to disappear.  Controlled
over exposure can create a circle or close to it.  Bill Moffat.

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On
Behalf Of Yingnan Wang
Sent: Tuesday, August 03, 2010 7:03 AM
To: [email protected]
Subject: Re: [mems-talk] lithography fin etch to define silicon NW

Hi Chen,

I think you can round the corners by annealing the silicon NW in
hydrogen.

BR,

YN WANG