A new method of preparing gradient refractive-index (GRIN) rods by using the swollen-gel polymerization technique is discussed. The polymerization of methyl methacrylate with benzyl methacrylate (BzMA) was carried out in a poly(methyl methacrylate) tube. The diffusion of the higher-refractive-index monomer BzMA in the swollen gel led to the formation of a GRIN distribution. After complete polymerization, a good symmetric and bubble-free GRIN rod was fabricated. An image with no distortion can be observed through the GRIN rods prepared by swollen-gel polymerization.
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Liu et al. (1997) studied this question.
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