Racemized photonic crystals for physical unclonable function

Park, Geonhyeong; Park, Hyewon; Wolska, Joanna M.; Park, Jesse G.; Yoon, Dong Ki

doi:10.1039/d2mh00710j

Cited by 21 publications

(25 citation statements)

References 41 publications

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“…Thin films generating circulalry polarized luminescence (CPL), that is exhibiting the differential emission intensity of right and left circularly polarized light, are fascinating from an intellectual, chirality-focused perspective while also providing clear solutions to some open problems in optoelectronic technologies. Increasing the bandwidth of data processing and storage, , leveraging the contrast of light-emitting diodes and 3D displays, and developing anticounterfeiting types of tags with increased security , are particularly interesting manifestations of the transformative potential of CPL-active films. − Despite prominent successes in the areas of CPL, further efforts to maximize the applicative potential of CPL films are required, particularly developing strategies enabling enhancement, tuning, and active regulation of CPL activity in the solid state …”

Section: Introductionmentioning

confidence: 99%

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

et al. 2022

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Circularly polarized luminescent (CPL) films with high dissymmetry factors hold great potential for optoelectronic applications. Herein, we propose a strategy for achieving strongly dissymetric CPL in nanocomposite films based on chirality induction and energy transfer to semiconductor nanocrystals. First, focusing on a purely organic system, aggregation-induced emission (AIE) and CPL activity of organic liquid crystals (LCs) forming helical nanofilaments was detected, featuring green emission with high dissymmetry factors g lum ∼ 10 −2 . The handedness of helical filaments, and thus the sign of CPL, was controlled via minute amounts of a small chiral organic dopant. Second, nanocomposite films were fabricated by incorporating InP/ZnS semiconductor quantum dots (QDs) into the LC matrix, which induced the chiral assembly of QDs and endowed them with chiroptical properties. Due to the spectral matching of the components, energy transfer (ET) from LC to QDs was possible enabling a convenient way of tuning CPL wavelengths by varying the LC/QD ratio. As obtained, composite films exhibited absolute g lum values up to ∼10 −2 and thermally on/off switchable luminescence. Overall, we demonstrate the induction of chiroptical properties by the assembly of nonchiral building QDs on the chiral organic template and energy transfer from organic films to QDs, representing a simple and versatile approach to tune the CPL activity of organic materials.

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Section: Introductionmentioning

confidence: 99%

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

et al. 2022

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“…PUF is a security device that takes advantage of inherent randomness-which occurs during the manufacturing process unpredictably-as a security primitive. [12][13][14][15][16][17][18][19][20][21][22] This device is considered superior when the degree of randomness in the information it stores is high, thus lowering its susceptibility to brute-force attacks. However, utilizing magnetic spin glass patterns as a PUF device is impractical because they can be observed under strong magnetic fields and extremely low temperatures, significantly increasing the authentication complexity.…”

Section: Introductionmentioning

confidence: 99%

Planar Spin Glass with Topologically Protected Mazes in the Liquid Crystal Targeting for Reconfigurable Micro Security Media

et al. 2023

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The planar spin glass pattern is widely known for its inherent randomness, resulting from the geometrical frustration. As such, developing physical unclonable functions (PUFs)—which operate with device randomness—with planar spin glass patterns is a promising candidate for an advanced security systems in the upcoming digitalized society. Despite their inherent randomness, traditional magnetic spin glass patterns pose considerable obstacles in detection, making it challenging to achieve authentication in security systems. This necessitates the development of facilely observable mimetic patterns with similar randomness to overcome these challenges. Here, a straightforward approach is introduced using a topologically protected maze pattern in the chiral liquid crystals (LCs). This maze exhibits a comparable level of randomness to magnetic spin glass and can be reliably identified through the combination of optical microscopy with machine learning‐based object detection techniques. The “information” embedded in the maze can be reconstructed through thermal phase transitions of the LCs in tens of seconds. Furthermore, incorporating various elements can enhance the optical PUF, resulting in a multi‐factor security medium. It is expected that this security medium, based on microscopically controlled and macroscopically uncontrolled topologically protected structures, may be utilized as a next‐generation security system.

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“…Such force-responsive dual–modal changes of structural colors are highly desirable in reality not only because of the high security but also of the easy operation. Compared to other anticounterfeit labels based on solvents, thermal, pH, and photoresponsive PCs with physical unclonable functions, − the as-fabricated anticounterfeiting PCs possess obvious advantages, especially in their simple requirements of hand stretching and then observing patterns at designed directions, which can be easily realized and useful in practical applications.…”

Section: Resultsmentioning

confidence: 99%

Lattice Transformation-Induced Retroreflective Structural Colors

Wei,

Zhang,

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Retroreflective structural colors can usually be achieved based on interference combined with a total internal reflection mechanism or diffraction of a monolayer hexagonal twodimensional (2D) colloidal array. Here, a novel retroreflective structural color was generated based on a hexagonal−parallelogram lattice transformation by stretching 3D photonic crystals with nonclosely packed long-range order. Compared to previous retroreflective colors, this new retroreflective color exhibits two unique off/on color switches: (1) a strain-dependent off/on color switch along the stretching direction and (2) a sample horizontal rotation angle-dependent off/on color switch under the fixed strain. These strain-responsive retroreflective colors are ideal candidates for visually sensing kinesio tapes' strain in practical applications and anticounterfeiting. This work reveals a new structural color regulation mechanism and will advance potential applications in anticounterfeiting, sensing, displays, etc.

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Racemized photonic crystals for physical unclonable function

Abstract: As Internet of Things-based technologies continue to digitalize our society, the development of secure and robust identification systems against evolving adversaries remains a grave challenge. Recently, physical unclonable functions (PUFs)...

Cited by 21 publications

References 41 publications

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

Planar Spin Glass with Topologically Protected Mazes in the Liquid Crystal Targeting for Reconfigurable Micro Security Media

Lattice Transformation-Induced Retroreflective Structural Colors

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