Scientists Show How to Encode Secrets with Color EPFLEngineering
By Hussain AhmedFeb 16 2023Reviewed by Megan Craig, M.Sc. By changing the length and orientation of the nanorods, many different optical effects can be created that can be used in various applications.
In addition to using different types of structures, researchers have also investigated how the optical response of these structures can be modified by changing the polarization of the light. For example, rectangles, crosses and ellipses have been used to generate different polarization states, allowing for higher information density.
Another challenge is the sensitivity of the spectral response of nanostructures to polarization orientation. While this sensitivity can be used as a key for decryption, it can also make the system vulnerable to attacks that exploit polarization changes. As the pedestal height is more than 80 nm, the connection between the nanoparticles and the mirror plane is insignificant.
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