Optical edge imaging based on the birefringence property and electro-optic tunability characteristic of the liquid crystals

Xie, Jin; Zeng, Tibin; Zhou, Yingjie; Yuan, Yide; Zhou, Yaqin; Lin, Tiegang; Jiang, Xuxian; Fan, Fan; Wen, Shuangchun

doi:10.1080/02678292.2021.1909766

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…[5] Therefore, it has received extensive attention in all-optical image processing such as optical analog edge detection, [6][7][8] polarimetric imaging, [9,10] microscopic imaging, [11,12] and quantum all-optical image processing. [13,14] Likewise, liquid crystal (LC) superstructures are naturally self-assembled, fully 2𝜋 phase-controllable, DOI: 10.1002/adom.202301421 high transmittance, and electrically adjustable and have made important progress in optical analog operations, [15][16][17][18][19] neareye display, [20][21][22] non-mechanical beam steering, [23] and LC-based smart optical devices. [24] Recently, many active metasurfaces have been proposed, which usually need to be combined with active materials to achieve multifunctional requirements under the stimulation of external fields (electric, thermal, and optical fields).…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband Moiré‐PB Doublet Lens for Multifunctional Microscopy

Ye,

Xue,

Zhou

et al. 2023

Advanced Optical Materials

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Liquid crystal superstructures or metasurfaces based on Pancharatnam−Berry (PB) phase have made remarkable progress in all‐optical image processing due to the advantages of miniaturization, integration, and multi‐dimensional light field modulation. However, conventional static PB phase devices are usually not tunable and with a single function. Here, based on the tunability of the moiré effect, the wavelength‐independent effect of the PB phase, and the principle of retardation compensation, an ultra‐broadband multifunction moiré‐PB doublet lens is designed, which can realize optical edge imaging with a tunable resolution ranging from 13.2 to 57.2 µm and ultra‐broadband conventional and polarimetric imaging to meet the requirement of multiple functionalities and system integration. In addition, edge feature extraction or edge imaging of low‐contrast biological samples is also realized. Benefiting from the characteristics of miniaturization, switchable multiple imaging functions, and real‐time parallel processing, this method may expand the practicability of modern optical image processing, microscopic imaging, and biomedicine.

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Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband Moiré‐PB Doublet Lens for Multifunctional Microscopy

Ye,

Xue,

Zhou

et al. 2023

Advanced Optical Materials

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“…In addition, its unique optical properties of birefringence, scattering, and reflection, derived from its mesogenic orientation, are basic characteristics of LCs, which has been widely utilized for optical applications. [15][16][17][18][19][20][21] In 1888, the LC phase was first discovered by Austrian scientist F. Reinitzer and Germany physicist O. Lehmann, [22] and then many studies have been conducted on its preparation, performance exploration and applications. [23][24][25][26][27][28][29] Among the diverse range of LC phases, the nematic phase is one of the most common types as display materials for information propagation and exhibition, wherein the molecules exhibit orientational order only along the long molecular axis (called the director).…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that LCs have remarkable responsiveness to external stimuli such as electric, light, thermal and magnetic fields, and the mechanically‐rubbed polymer surface, [7–14] which is the basis of modern LC displays. In addition, its unique optical properties of birefringence, scattering, and reflection, derived from its mesogenic orientation, are basic characteristics of LCs, which has been widely utilized for optical applications [15–21] …”

Section: Introductionmentioning

confidence: 99%

Progress in Fabrication and Applications of Cholesteric Liquid Crystal Microcapsules

Zhang,

Yang,

Chen

et al. 2023

Chemistry A European J

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Liquid crystals (LCs) are well known for inherent responsiveness to external stimuli, such as light, thermal, magnetic, and electric fields. Cholesteric LCs are among the most fascinating, since they possess distinctive optical properties due to the helical molecular orientation. However, the good flow, easy contamination, and poor stability of small‐molecule LCs limit their further applications, and microencapsulation as one of the most effective tools can evade these disadvantages. Microencapsulation can offer shell‐core structure with LCs in the core can strengthen their stability, avoiding interference with the environment while maintaining the stimuli‐responsiveness and optical properties. Here, we report recent progress in the fabrication and applications of cholesteric LC microcapsules (CLCMCs). We summarize general properties and basic principles, fabrication methods including interfacial polymerization, in‐situ polymerization, complex coacervation, solvent evaporation, microfluidic and polymerization of reactive mesogens, and then give a comprehensive overview of their applications in various popular domains, including smart fabrics, smart sensor, smart displays, anti‐counterfeiting, information encryption, biomedicine and actuators. Finally, we discuss the currently facing challenges and the potential development directions in this field.

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“…[16][17][18][19][20][21][22] In addition, the optical properties, such as birefringence, scattering and reflection, derived from the inherent arrangement of the molecules, are also basic characteristics of the LCs, and can be easily observed by naked eyes with some optical techniques. [23][24][25][26][27][28] Combining sensing (stimuli responsive) and expression (optical properties) together, LCs have been widely used in the fields of light modulation, display, data storage and sensors. [29][30][31][32] Despite these substantial superiorities, there remain numerous open questions for further developing LCs, among which the fluidity renders their stability and versatility.…”

Section: Introductionmentioning

confidence: 99%