Y. Shimamoto and S. Komatsu: 5 Dimensional Optical Digital Key Utilizing Temporal Characteristics of　Light-Emitting Material, Extended Abstracts (Optics and Photonics Japan 2009) (2009) 92-93. (24aF2)

Utilizing the temporal characteristics of light-emitting materials we produce an optical token with four-dimensional key pattern. By increasing the complexity of the key pattern we can improve its security. By adding another dimension of wavelength, five-dimensional optical digital key may be realized.