In this case an aray with holes in metal is necessary, as you do whe making
CV plots.
Henri

2009/5/2 Jackgong Hotmail 

> I also have the same question. But I want to drill a array of holes through
> glass or any other transparent(to visible light) materials and the diameter
> is around 400 micron. Hope some one can help us.
>
> Gong