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Opt Express. 2004 Jun 28;12(13):2925-31.

Cryptography based on the absorption/emission features of multicolor semiconductor nanocrystal quantum dots.


Further to the optical coding based on fluorescent semiconductor quantum dots (QDs), a concept of using mixtures of multiple single-color QDs for creating highly secret cryptograms based on their absorption/emission properties was demonstrated. The key to readout of the optical codes is a group of excitation lights with the predetermined wavelengths programmed in a secret manner. The cryptograms can be printed on the surfaces of different objects such as valuable documents for security purposes.

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