Microfluidic printing directing photonic crystal bead 2D code patterns

Liu, Kang‐Zhi; Tian, Yu; Li, Qing; Du, Xiang‐Yun; Zhang, Jing; Wang, Cai‐Feng; Chen, Su

doi:10.1039/c7tc05355j

Cited by 27 publications

(15 citation statements)

References 33 publications

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“…Thus, the multidipole system reproducibly arranges itself to reach an electrostatic equilibrium, keeping the energy of the system at the minimum level. Future study of this effect is warranted (including the potential influence of electrohydrodynamic flow), but we propose that the self‐assembly of beads into symmetric patterns may someday be useful for making photonic crystals or plasmonic structures …”

Section: Resultsmentioning

confidence: 99%

Patterned Optoelectronic Tweezers: A New Scheme for Selecting, Moving, and Storing Dielectric Particles and Cells

Zhang

Shakiba

Chen

et al. 2018

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Optical micromanipulation has become popular for a wide range of applications. In this work, a new type of optical micromanipulation platform, patterned optoelectronic tweezers (p‐OET), is introduced. In p‐OET devices, the photoconductive layer (that is continuous in a conventional OET device) is patterned, forming regions in which the electrode layer is locally exposed. It is demonstrated that micropatterns in the photoconductive layer are useful for repelling unwanted particles/cells, and also for keeping selected particles/cells in place after turning off the light source, minimizing light‐induced heating. To clarify the physical mechanism behind these effects, systematic simulations are carried out, which indicate the existence of strong nonuniform electric fields at the boundary of micropatterns. The simulations are consistent with experimental observations, which are explored for a wide variety of geometries and conditions. It is proposed that the new technique may be useful for myriad applications in the rapidly growing area of optical micromanipulation.

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Section: Resultsmentioning

confidence: 99%

Patterned Optoelectronic Tweezers: A New Scheme for Selecting, Moving, and Storing Dielectric Particles and Cells

Zhang

Shakiba

Chen

et al. 2018

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“…Chen and co‐workers demonstrated a fluorescent 2D photonic crystal code pattern by microfluidic printing technology using polymeric core‐quantum dots shell spheres. [ 152 ] The micropattern of the 2D code inscribed bright green and red structural colors at different pixels and exhibited a fluorescent image under UV excitation as shown in Figure 19b. The polarization feature of chiral nematic CNCs could modulate the fluorescence in an anisotropic way, leading to polarization‐dependent structural color‐luminescence encryption.…”

Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

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The counterfeiting of goods is growing worldwide, affecting practically any marketable item ranging from consumer goods to human health. Anticounterfeiting is essential for authentication, currency, and security. Anticounterfeiting tags based on structural color materials have enjoyed worldwide and long‐term commercial success due to their inexpensive production and exceptional ease of percept. However, conventional anticounterfeiting tags of holographic gratings can be readily copied or imitated. Much progress has been made recently to overcome this limitation by employing sufficient complexity and stimuli‐responsive ability into the structural color materials. Moreover, traditional processing methods of structural color tags are mainly based on photolithography and nanoimprinting, while new processing methods such as the inkless printing and additive manufacturing have been developed, enabling massive scale up fabrication of novel structural color security engineering. This review presents recent breakthroughs in structural color materials, and their applications in optical encryption and anticounterfeiting are discussed in detail. Special attention is given to the unique structures for optical anticounterfeiting techniques and their optical aspects for encryption. Finally, emerging research directions and current challenges in optical encryption technologies using structural color materials is presented.

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“…265 Chen et al showed a letter-shaped magnetic-responsive panel display based on magnetic-optic dual-functional Janus supraballs and a microfluidic strategy. 21,267,268,271,272 The researchers fabricated hydrophobic poly(tert-butyl acrylate) (PtBA) PCs via a facile soap-free emulsion polymerization. They demonstrated enhanced photoluminescence intensity of the CdSe@ZnS quantum dot film in the LCD device based on the unique photonic bandgap of PtBA PCs.…”

Section: Displaysmentioning

confidence: 99%