RE: Pictorico for Zone Plate

Hi:

I think the pixelated image - even though its very minute may cause
problems with a traditional zoneplate. If I understand them correctly a
zoneplate focuses by the creation of an interference a pattern caused by
the diffraction of light rays on the rings of the zoneplate. The edges of
a zoneplate created with a finely pixelated image may not create a
consistent pattern of diffraction. It may work but I don't think the
image formed would be as sharp as one using a true vector image.

A good compromise might be a photon sieve. A photon sieve consists of a
large number of appropriately distributed pinholes instead of rings as the
diffracting elements. It might be less dependent on a distict edge. The
diffraction effect is distributed amonst many small pinholes.

I'm no physicist - it might more dependent on perfect circles than a zone
plate.

See http://ca.geocities.com/penate%40rogers.com/sieve/photonsieve.html

I tried making zone plates with an imagesetter from postscript files. I
ended up making zoneplates with circles with smaller thicknesses than the
imagesetter was capable of cleanly producing.

On Tue, 21 Feb 2006, Loris Medici wrote:

> Lith film should be more suitable for that purpose (zone plate - Goggle
> for the program "Pinhole Designer"; it gives you the possibility to
> design a zone plate .pdf file that you can have it printed with a very
> high resolution imagesetter at a service bureau). BTW, I never heard
> anything such as a pinhole "lens" ;)
>
> Regards,
> Loris.
>
> -----Original Message-----
> From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
> Sent: 20 Žubat 2006 Pazartesi 23:37
> To: alt-photo-process-l@sask.usask.ca
> Subject: Pictorico for Zone Plate
>
>
> Has anyone had success using Pictorico OHP to make Zone Plate or Pinhole
> lenses?
>
> ~m
>
>

---------------------------------------------------------
Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
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Received on Tue Feb 21 09:20:24 2006