Abstract
In ubiquitous information society, thin and secure data storage media with moderate storage capacity are useful. It can be attached to a paper or a cloth like a stamp or a seal. For this purpose, we have been developing a thin data storage medium using absorbers embedded in an artificial scattering medium [1,2]. In the artificial scattering medium, the complicated scattering coefficient distribution can be fabricated by voids created by femtosecond laser processing. The complicated scattering coefficient distribution works as the key to reconstruct numerically the absorption distribution. We have also proposed a numerical reconstruction method using pairs of input and output intensity distributions and the scattering coefficient distribution like optical diffusion tomography. In the reconstruction method, we can make a numerical model where the scattering coefficient distribution is known and the absorption distribution is unknown distribution. By using this model, numerical output intensity distribution is calculated by solving a numerical optical diffusion equation. Experimental output intensity distribution can be obtained. The reconstruction method can modify the absorption distribution so as to decrease the difference between the experimental and numerical output intensity distribution. Iterative process is introduced to make the estimation close to the original one. However, the widths of the reconstructed absorbers become about three times larger than the original one [2].
© 2011 Optical Society of America
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