The increasing risk of advanced counterfeits always poses a need for a security device that can combat them. A technology never known before can be utilized in security devices. However, it is hard to make a comparison of their strengths as no standards were available to quantify their performance.
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IMAGE: Schematic illustration of switchable metasurfaces
Full-color image is switched on (top) and concealed (bottom) by the polarization angle (0° and 90°) of the incident light, making it applicable to cryptography.. view more
Credit: POSTECH
Despite the anticounterfeiting devices attached to luxury handbags, marketable securities, and identification cards, counterfeit goods are on the rise. There is a demand for the next-generation anticounterfeiting technology - that surpasses the traditional ones - that are not easily forgeable and can hold various data.
A POSTECH research team, led by Professor Junsuk Rho of the departments of mechanical engineering and chemical engineering, Ph.D. candidates Chunghwan Jung of the Department of Chemical Engineering and Younghwan Yang of the Department of Mechanical Engineering, have together succeeded in making a switchable display device using nanostructures that is capable of encrypting full-color images depending