aluminium coated CCD

[Paul.Jorden at eev.com]

Posted to CCD-world:
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Jean Marc
(cc: to ccd-world, for information)

 > EUV applications (17.1 to 30.4 nm) usually require the use of very thin
 > aluminium filters which block all the visible/IR light and wavelengths 
lower
 > than 17,1 nm. These filters are very fragile when used in space 
instruments
 > or vacuum chambers.
 >
 > I was simply wondering if it was possible to put directly an aluminium 
layer
 > on the CCD (usually backside thinned) instead of additional filters in 
the
 > optical beam.
 >
 > I was not thinking about using this material as "transparent" gates for
 > charge collection. It sounds another good idea...
 >
EEV have made CCDs with Al on the backside.  These were for the space RGS 
x-ray instrument.  The Al layer served a similar purpose (ie blocked longer 
wavelengths).
They worked fine.
Would you like a sample chip to test (no promises, but I could look)?
Do you know what thickness you need for the EUV application?
Would a thin intermediate layer of MgF2 be OK?

Cheers,
Paul
_______________________________________________________________
Dr Paul Jorden,  CCD Applications, EEV
Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK
Tel:      44 (0) 1245 -453458 (direct), -493493 (switchboard)
Fax:      44 (0) 1245 453224
see also:-     http://www.ccd.eev.com/

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