I can't give you specifics but I've looked at the opposite side of this
equation (low dn/dT) and can tell you that what YOU want is to have the
temperature range of interest be above the Tg of your material.
Secondly you'll want something with a high CTE.  You'll have the
greatest dn/dT when you've got a significant volumetric change over your
temperature range of interest.

Good luck,
Matt

-----Original Message-----
From: mems-talk-bounces@memsnet.org
[mailto:mems-talk-bounces@memsnet.org] On Behalf Of Aashish Singh
Sent: Tuesday, March 14, 2006 1:59 AM
To: mems-talk@memsnet.org
Subject: [mems-talk] Transparent POlymer or adhesive for quartz

  Dear All,

  I'm looking for a Transparent Polymer/Adhesive with very large dn/dT,
that can be spin coated over quartz. i have tried popular Norland
Optical adhesive, but its dn/dT is not as large as i want. The
polymer/adhesive we will use at both visible and IR region. The
dispersion curve (variation of R.I with Wavelength) , dn/dT and  low
absorption at the wavelength of operation is important for my
applications.
  Any information and the source form where we can get it will be highly
appreciated.