[Libre-silicon-devel] Maskless lithography

ludwig jaffe ludwig.jaffe at gmail.com
Sun Apr 12 23:38:31 CEST 2020

But you need reproduceable movements.
Try to move from right to left and from left back to right and find the offset.

What holds true for a turning machine also holds true for a chip scale machine.
The problem are similar but shrunk together with the requirements in dimension.
So turning at 0.05mm is enough for most applications, and the chip needs to be
0.05um precise. :-)

On 4/10/20, David Lanzendörfer <leviathan at libresilicon.com> wrote:
> Hi everyone
> So last Sunday, Ferenc and I brainstormed on how to achieve smaller feature
> sizes with a UV wave length, which limits us to 400nm or so.
> We discussed splitting a lower feature size layout into multiple masks
> and then doing overlapping exposure steps.
> Ferenc pointed out, that we might run into an offset issue.
> I've been thinking about this for a while and the solution came to me on the
> toilet just now, and it's actually surprisingly simple.
> Since we're using a DMD and not physical masks, we can do the multiple
> exposure steps all at once, without any stepping in between.
> while(!eow()) { // end of wafer
> expose_mask(1);
> expose_mask(2);
> step_to_next();
> }
> cheers
> -lev

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