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Bhupathi, Pradeep,Hwang, Jungseek,Martin, Rodica M.,Blankstein, Jackson,Jaworski, Lukas,Mulders, Norbert,Tanner, David B.,Lee, Yoonseok The Optical Society 2009 Optics express Vol.17 No.13
<P>Optical transmission measurements were made on 98% porosity silica aerogel samples under various degrees of uniaxial strain. Uniaxially compressed aerogels exhibit large birefringence, proportional to the amount of compression, up to the 15% strain studied. The birefringence is mostly reversible and reproducible through multiple compression-decompression cycles. Our study demonstrates that uniaxially strained high porosity aerogels can be used as tunable waveplates in a broad spectral range.</P>