Hi, there, Any one has experince etching BK7 glass? What I need is 3 micron wide and 4 micron deep, do I need to use RIE? What kind of plasma and what kind of mask should I use? Appreciate your help! Jizuo Zou Microelectronic Research Center University of Texas at Austin Austin, Texas 78758 Email: zoujz@mail.utexas.edu