Phys.org July 17, 2023
Researchers in the Netherlands have developed an optical communication system with two scattering layers to hide both the sender and receiver, by measuring the correlation of the intermediate speckle generated between the two layers. The binary message is modulated as spatially shaped wavefronts, and the high number of transmission modes of the scattering layers allowed for many uncorrelated incident wavefronts to send the same message, making it difficult for an attacker to intercept or decode the message and thus increasing secrecy. They collected 50,000 intermediate speckle patterns and analyzed their correlation distribution using the Kolmogorov-Smirnov (K-S) test. They searched for further correlations using the K-Means and Hierarchical unsupervised classification algorithms. They did not find any correlation between the intermediate speckle and the message, suggesting that the message could not be intercepted. According to the researchers this method is compatible with any digital encryption method and is applicable for codification in optical communication… read more. Open Access TECHNICAL ARTICLEÂ
Schematic of the light scattering systems studied here… Credit: Optics Express, Vol. 31, Issue 15, pp. 23897-23909 (2023)Â