Helical Nanostructures: Chirality Transfer and a Photodriven Transformation from Superhelix to Nanokebab

Angewandte Chemie International Edition, Год журнала: 2018, Номер 58(3), С. 785 - 790

Опубликована: Ноя. 14, 2018

Photosensitive cinnamic acid conjugated glutamides were designed to demonstrate photocontrolled hierarchical chirality transfer and switching in self-assembled systems. In methanol, the derivatives into superhelices, which could be switched nanokebabs upon UV irradiation. These two nanostructures showed opposite helicity. The chiral further convey their achiral fluorescent molecules result emission of circularly polarized luminescence (CPL). Remarkably, CPL followed helicity nanostructure rather than inherent molecular chirality. Photodriven dimerization moiety lead a significant change packing subsequent formed nanostructures.

Язык: Английский

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Chirality invertible superstructure mediated active planar optics

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Июнь 7, 2019

Abstract Active planar optical devices that can dynamically manipulate light are highly sought after in modern optics and nanophotonics. The geometric phase derived from the photonic spin-orbit interaction provides an integrated strategy. Corresponding elements usually suffer static functions. Here, we introduce inhomogeneously self-organized anisotropic medium featured by photo-invertible chiral superstructure to realize with continuously tunable working spectrum light-flipped profile. Via preprograming alignment of a cholesteric liquid crystal mixed photo-responsive dopant, demonstrate light-activated deflector, lens, Airy beam vortex generators. Their polychromatic bands reversibly tuned ultra-broadband over 1000 nm covering green telecomm region. chirality inversion triggers facile switching functionalities, such as steering, focusing/defocusing spin-to-orbital angular momentum conversion. This work offers platform for advanced adaptive multifunctional flat merits high compactness, low loss broad bandwidth.

Язык: Английский

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Self-assembled liquid crystal architectures for soft matter photonics

Light Science & Applications, Год журнала: 2022, Номер 11(1)

Опубликована: Сен. 13, 2022

Self-assembled architectures of soft matter have fascinated scientists for centuries due to their unique physical properties originated from controllable orientational and/or positional orders, and diverse optic photonic applications. If one could know how design, fabricate, manipulate these optical microstructures in systems, such as liquid crystals (LCs), that would open new opportunities both scientific research practical applications, the interaction between light matter, intrinsic assembly topological patterns, multidimensional control (polarization, phase, spatial distribution, propagation direction). Here, we summarize recent progresses self-assembled typical thermotropic LCs bio-based lyotropic LCs. After briefly introducing basic definitions materials, present manipulation schemes various LC microstructures, especially topographic configurations. This work further illustrates external-stimuli-enabled dynamic controllability structures demonstrates several emerging Lastly, discuss challenges materials towards photonics, envision future perspectives this field.

Язык: Английский

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Circularly polarized luminescence in chiral orientationally ordered soft matter systems

Deleted Journal, Год журнала: 2023, Номер 1(1)

Опубликована: Июль 23, 2023

Abstract Circularly polarized luminescent (CPL) materials have received significant attention in the field of fundamental science recently. These offer substantial advancement technological applications, such as optical data storage, displays, and quantum communication. Various strategies been proposed self‐assembled consisting inorganic, organic, hybrid systems, particularly chiral orientationally ordered soft matter systems (e.g., liquid crystals (LCs) LC polymers). However, developing scientific approaches to achieve pronounced steerable circularly light emission remains challenging. Herein, we present a comprehensive review on recent development CPL based LCs, including thermotropic LCs (cholesteric bent‐core LCs), lyotropic (nanocellulose polyacetylene‐based polymers LC‐based polymers, helical nanofibers, network). In addition, mechanisms, design principles, potential applications these are systematically reviewed. This summarizes with prospect latent challenges, which can strengthen our understanding basic principles provide new insight into progress several fields, chemistry, science, optics, electronics, biology.

Язык: Английский

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Advances on broadband and resonant chiral metasurfaces

Deleted Journal, Год журнала: 2024, Номер 1(1)

Опубликована: Июнь 28, 2024

Abstract Chirality describes mirror symmetry breaking in geometric structures or certain physical quantities. The interaction between chiral structure and light provides a rich collection of means for studying the chirality substances. Recently, optical metasurfaces have emerged as planar quasi-planar photonic devices composed subwavelength unit cells, offering distinct appealing responses to circularly polarized with opposite handedness. chiroptical effects can be manifested absorption, scattering, even emission spectra under circular polarization bases. A broadband effect is highly desired many passive applications such pure polarizers, imaging, holography, which cases resonances should avoided. On other hand, resonant are particularly needed situations requiring strong field enhancement sensing emission. This article reviews latest research on both metasurfaces. First, we discuss basic principle different types including 3D/2D intrinsic/extrinsic chirality. Then review typical metasurfaces, related imaging holography. Then, matter enhanced by especially bound states continuum ultra-high quality factors, important molecule sensing, sources. In final section, concludes an outlook future directions photonics.

Язык: Английский

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Soft Materials Driven by Photothermal Effect and Their Applications

Advanced Optical Materials, Год журнала: 2018, Номер 6(15)

Опубликована: Июнь 10, 2018

Abstract Remote driving of functional hybrid soft materials for various applications is emerging as an enabling pursuit. Toward this end, driven by photothermal agents have been attracting tremendous attention from both fundamental science and technological points view. These stimuli‐responsive combine the beneficial attributes classes promising materials, i.e., agents. Both inorganic organic incorporated into matrices materials. Metal nanoparticles, carbon nanomaterials, impregnated liquid crystals, polymers, gels that can be remotely light irradiation. In review, remote their are discussed. Photothermal nanocomposites demonstrated to act actuators, therapeutic agents, drug delivery systems, microvalves, etc. Smart adaptive systems realized dispersing matter matrices. Challenges opportunities in fascinating frontier outlined.

Язык: Английский

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1,2‐Dithienyldicyanoethene‐Based, Visible‐Light‐Driven, Chiral Fluorescent Molecular Switch: Rewritable Multimodal Photonic Devices

Angewandte Chemie International Edition, Год журнала: 2019, Номер 58(45), С. 16052 - 16056

Опубликована: Сен. 5, 2019

Reported here is the first example of a 1,2-dithienyldicyanoethene-based visible-light-driven chiral fluorescent molecular switch that exhibits reversible trans to cis photoisomerization. The form in solution almost completely transforms into form, accompanied by 10-fold decrease its fluorescence intensity within 60 seconds when exposed green light (520 nm). reverse isomerization proceeds upon irradiation with blue (405 When doped commercially available achiral liquid crystal hosts, this efficiently induces luminescent helical superstructures, is, cholesteric phase. circularly polarized as well selective reflection wavelength induced phases can be reversibly tuned using visible two different wavelengths. Optically rewritable photonic devices films containing are described.

Язык: Английский

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Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Applied Sciences, Год журнала: 2019, Номер 9(12), С. 2512 - 2512

Опубликована: Июнь 20, 2019

The research field of liquid crystals and their applications is recently changing from being largely focused on display optical shutter elements in various fields, to quite novel diverse the area nanotechnology nanoscience. Functional nanoparticles have been used a significant extent modify physical properties by addition ferroelectric magnetic particles different shapes, such as arbitrary spherical, rods, wires discs. Also, influencing are increasingly popular, quantum dots, plasmonic, semiconductors metamaterials. self-organization exploited order templates orient nanoparticles. Similarly, nanotubes graphene oxide shown form lyotropic crystal phases presence isotropic host solvents. These effects lead wealth applications, many which will be reviewed this publication.

Язык: Английский

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Photoresponsive Actuators Built from Carbon‐Based Soft Materials

Advanced Optical Materials, Год журнала: 2019, Номер 7(16)

Опубликована: Май 24, 2019

Abstract Photoresponsive soft actuators with photomechanical energy conversion and flexibility have attracted significant interest in recent years owing to their unique merits of flexibility, contactless operation, remote control, as well multiple technological applications ranging from bionic robotics biomedical devices nanomotors. Seeking efficient photoresponsive materials high efficiency robust mechanical properties identifying effective photoactuation mechanisms are paramount significance for the development advanced photoactuators. Due optical properties, strength, superior electrical thermal conductivity, good stability, carbon‐based regarded attractive candidates high‐performance actuators. Furthermore, easy functionalization or hybridization other functional species substantially extends functions these widens application scope Herein, this review summarizes progress photoactuators based on various materials, including 0D, 1D, 2D, 3D nanocarbons composites responsive materials. Multiple driving schemes photothermal, photomechanical, photoelectronic, photochemical effects, photoactuating architecture design, potential elucidated. certain future opportunities challenges ever‐flourishing optical‐to‐mechanical area emphasized discussed.

Язык: Английский

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Mirror symmetry breaking in liquids and liquid crystals

Liquid Crystals, Год журнала: 2018, Номер 45(13-15), С. 2221 - 2252

Опубликована: Сен. 6, 2018

In the recent two decades liquid crystal science has contributed significantly to understanding of mirror symmetry breaking and spontaneous emergence chirality in fluids. This account tries summarise current state crystalline mesophases, ranging from isotropic liquids, via cubic, columnar tetragonal SmQ phases polycatenar compounds, twist bend nematic bent dimesogens heliconical conglomerate type smectic bent-core mesogens. Especially, importance dynamic synchronisation molecular conformers, cooperativity, helical superstructures, layer chirality, network formation, as well chiral achiral surface effects is discussed. At end transition local absolute breaking, amplification relevance for uniform prebiotic fluids biosystems are considered.

Язык: Английский

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