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Stimulus-Responsive Photonic Crystals for Advanced Security

机译：Stimulus-Responsive Photonic Crystals for Advanced Security

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摘要

Counterfeiting is a growing global issue causing severe negative impactson the social economy and posing serious security threats to individualsand communities. However, the current anticounterfeiting technologiesare relatively well known to fakers and lack sufficient security owing to thedevelopment and commercialization of high-resolution equipment. Thus,designing new anticounterfeiting materials and systems is urgently needed.Photonic crystals (PCs) with vivid structural colors are promising materialsfor advanced security applications because of their unique optical characteristics.In particular, responsive PCs (RPCs), whose optical signals can be readilyadjusted by external stimuli, are expected to provide improved security andmay be used to determine the authenticity of banknotes, documents, anddrugs. In this review, the strategies are summarized for designing RPCs,including filling responsive materials into the interstitial space of periodicphotonic structures and using responsive materials as construction blocksof PCs. Subsequently, the latest progress in developing RPCs constructed foroptical encryption and information security is discussed in detail. Finally, thechallenges and outlook of using RPCs for optical encryption technologies arepresented.

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