Abstract
Optical transmission at 532 nm from nonabsorbing disordered porous silicon
dioxide has been studied experimentally. The transmission behaviors can be adjusted
by filling the pores with liquids of different refractive indics, which are analyzed
based on the theory of diffusion in a weak scattering regime. In our experiment, the
transmission coefficient changes from a value less than 1% to one that is greater
than 75%, that is, the opaque sample becomes transparent, which means that the
transport mean free path of light within the material has been effectively adjusted.
In addition, this method is a useful nondestructive method to derive the refractive
index of an unknown bulk porous material.
© 2011 Chinese Optics Letters
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