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- Bal, M.F. (author), Singh, M. (author), Braat, J.J.M. (author) journal article 2004
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Voogd, R.J. (author), Singh, M. (author), Braat, J.J.M. (author)We present a method to optically store multiple information in one location by having angular momentum imparted to the scanning beam by optical phase objects that make up the information areas on a surface. We show that the light beam thus perturbed carries an optical vortex, the rotation of which can be detected in the near-field focal region...conference paper 2004