The other definition that people usually do is alpha, which is the absorption
coefficient.  It is related by the following definition:
alpha=4*pi*k/lambdalambda is the wavelength in free space. RegardsZainal

Roger Shile  wrote:K is the usual symbol for the extinction
coefficient, or imaginary part of
the refractive index. K is a measure of the absorbtion of light through the
material.

Roger Shile

----- Original Message -----
From: "Peng Yao"
To:
Sent: Tuesday, April 08, 2003 2:34 PM
Subject: [mems-talk] what's the meaning of k for photoresist


> Hi everyone,
> I am using Az series photoresist. There is one parameter named "k" in the
> technical parameters, which varys a lot from unbleached photoresist to
> bleached photoresist. I guess it could have some relationship with
> absorption of light. Does anyone know the definition of this parameter?
> Thanks a lot!
>
>
> Peng Yao
> DOEs lab
> Electrical Engineering Dept.
> Univeristy of delaware
> Newark D.E 19716
>
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