Hidden Structural Colors from Bistable, Electrically Driven Covalent Organic Framework Photonic Assemblies for Secure Optical Encoding
Tolga Zorlu, Flora Schöfbeck, Julian Lemmel, Daoming Sun, Tanja Eder, Michael R. Reithofer, Jia Min Chin
TL;DR
This paper introduces a secure optical encryption system using electrically controlled covalent organic framework particles that hide and reveal data under specific viewing conditions.
Contribution
A novel bistable, electrically driven COF-based photonic system for secure optical encoding with tunable concealment via surface roughness.
Findings
COF particles enable dynamic and bistable optical encryption under bright-field microscopy.
Surface roughness controls concealment and transforms scattering into a security feature.
The system offers compact, multifactor encryption for secure displays and anticounterfeiting.
Abstract
Optical encryption using nanostructured materials provides a powerful route for secure data encoding. In this work, an electrically reconfigurable colloidal photonic platform based on covalent organic framework (COF) particles is described, enabling dynamic and bistable data encryption. Spatially controlled electrophoretic assembly of monodisperse COF particles within patterned cells produces Bragg reflections that are visible only under bright-field (BF) microscopy as strong broadband scattering from nanoscale particle surface roughness conceals the encoded states from the naked eye. By tuning the synthesis time, the particle surface roughness and, thus, the degree of concealment can be precisely controlled. Unlike conventional optical systems, where scattering degrades visibility, we report it as an intrinsic security feature, transforming a loss mechanism into a tool for optical…
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Taxonomy
TopicsGold and Silver Nanoparticles Synthesis and Applications · Photonic Crystals and Applications · Covalent Organic Framework Applications