Abstract
A coherent array of silica spheres, which was implanted with erbium ions, showed nonlinear behavior at λ=0.532 μm. This was attributed to a large nonlinear refraction effect, which was enhanced by the structure of the opaline matrix. In addition, near infrared photoluminescence measurements showed an overall enhancement as a function of the sphere’s size. A large photoluminescence peak was found around λ=900 nm and attributed to the lensing effect of the opaline matrix.
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