A Polymeric Optical Correlator for Security Verification

Rapid technological progress, especially in computers, CCD technology, color printers and scanners makes forgery and counterfeit of identification documents such as credit cards, or other important objects, increasingly simple. Current techniques such as the embossed hologram on credit cards are being defeated, and there is a strong need for a continuous development of new optical methods for security applications to stay ahead of counterfeiters. Optical security features can be inspected by either visual checking without special equipment or with the help of technical facilities for rapid screening. When such an optical system is required for security checking, its low manufacturing cost is a critical issue for its technological viability.