共查询到20条相似文献，搜索用时 0 毫秒
1.
Ufuk Kilic Matthew Hilfiker Alexander Ruder Rene Feder Eva Schubert Mathias Schubert Christos Argyropoulos 《Advanced functional materials》2021,31(20):2010329
Designing broadband enhanced chirality is of strong interest to the emerging fields of chiral chemistry and sensing, or to control the spin orbital momentum of photons in recently introduced nanophotonic chiral quantum and classical optical applications. However, chiral light-matter interactions have an extremely weak nature, are difficult to control and enhance, and cannot be made tunable or broadband. In addition, planar ultrathin nanophotonic structures to achieve strong, broadband, and tunable chirality at the technologically important visible to ultraviolet spectrum still remain elusive. Here, these important problems are tackled by experimentally demonstrating and theoretically verifying spectrally tunable, extremely large, and broadband chiroptical response by nanohelical metamaterials. The reported new designs of all-dielectric and dielectric-metallic (hybrid) plasmonic metamaterials permit the largest and broadest ever measured chiral Kuhn's dissymmetry factor achieved by a large-scale nanophotonic structure. In addition, the strong circular dichroism of the presented bottom-up fabricated optical metamaterials can be tuned by varying their dimensions and proportions between their dielectric and plasmonic helical subsections. The currently demonstrated ultrathin optical metamaterials are expected to provide a substantial boost to the developing field of chiroptics leading to significantly enhanced and broadband chiral light-matter interactions at the nanoscale. 相似文献
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Eitan Oksenberg Ilan Shlesinger Gökçen Tek A. Femius Koenderink Erik C. Garnett 《Advanced functional materials》2023,33(8):2211154
The surface-enhanced counterparts of Raman scattering (SERS) and infrared (IR) absorption (SEIRAS) are commonly used to probe and identify nanoscale matter and small populations of molecules. The contrasting selection rules offer complementary vibrational information of bulk solids or solutions. In this study, a complementary surface-enhanced vibrational spectroscopy approach is presented to probe the vibrational signature of metal-bound molecular monolayers. Nanocavities are designed and produced with sharp and tunable visible (VIS) and mid-IR gap resonances by placing nanorods on a mirror that is coated with a thin dielectric spacer. Their VIS resonances are tuned to match a 1.61 eV (770 nm) resonant excitation for SERS, while their mid-IR resonances span the 1500–2800 cm−1 range (6.5–3.5 µm) in high resolution for SEIRAS, targeting CN bond vibrations at 2220 cm−1. Both the VIS and mid-IR gap modes support spatially overlapping and highly enhanced near-fields ensuring strong SERS and SEIRAS signals from the same monolayer molecular population. The differences in the vibrational information obtained with the two surface-enhanced spectroscopies when probing coupled molecular vibrations are highlighted and the advantages of using such a platform for investigating cavity-modified chemical reactions are discussed. 相似文献
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Invisibility dips, i.e., minima in scattering spectrum associated with asymmetric Fano‐like line‐shapes, have been predicted with transformation optics in studying strong coupling between two plasmonic nanoparticles. This feature of strongly coupled plasmonic nanoparticles holds promise for sensor cloaking. It requires an extremely narrow gap between the two nanoparticles, preventing its experimental observation at optical frequencies. Here, the concept of spoof surface plasmons is used to facilitate the strong coupling between two spoof‐localized‐surface‐plasmon (SLSP) resonators. Instead of observing in far field, the near‐field energy transport is probed through the two SLSP resonators. By virtue of enhanced coupling between the two resonators stacked vertically, a spectral transmission dip with asymmetric Fano‐like line‐shape, similar to the far‐field “invisibility dips” predicted by transformation optics, is observed. The underlying mode interference mechanism is further demonstrated by directly imaging the field maps of interfered waves that are tightly localized around the resonators. These near‐field “invisibility dips” may find use in near‐field sensing, on‐chip switching, filters, and logical operation elements. 相似文献
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Shao-Feng Liu Zheng-Wei Hou Linhan Lin Zhengcao Li Hong-Bo Sun 《Advanced functional materials》2023,33(39):2211280
3D laser nanoprinting represents a revolutionary manufacturing approach as it allows maskless fabrication of 3D nanostructures at a resolution beyond the optical diffraction limit. Specifically, it endows the printed structures novel physical, chemical, or mechanical properties not observed at macroscopic scale. However, 3D laser nanoprinting typically relies on the photopolymerization process, indicating its limitation on the printable materials and functionalities. The capability to print diverse functional materials beyond polymer will enable a lot of new device applications in nanophotonics, microelectronics, and so on. One of the strategies is to use the 3D-printed polymer structures as skeletons for functional material deposition, while another is to mix the functional components with the photocurable molecules and print the nanocomposites. More recently, several laser nanoprinting techniques beyond photopolymerization are also developed. In this review, the cutting-edge technical innovation is summarized and a couple of examples are highlighted showing exciting applications of the printed structures in magnetic microrobots, photonics, and optoelectronics. Finally, the vision for existing challenges and future development in this field is shared. 相似文献
5.
C. Favazza J. Trice A. K. Gangopadhyay H. Garcia R. Sureshkumar Ramki Kalyanaraman 《Journal of Electronic Materials》2006,35(8):1618-1620
Most metals on SiO2 have a finite contact angle and are therefore subject to dewetting during thermal processing. The resulting dewetting morphology
is determined primarily by nucleation and growth or instabilities. The dewetting mechanism implies a disordered spatial arrangement
for homogeneous nucleation, but an ordered one for instabilities such as spinodal decomposition. Here, we show that the morphology
of laser-melted ultrathin Co film (4-nm thick) can be attributed to dewetting via an instability. Dewetting leads to breakup
of the continuous Co film into nanoparticles with a monomodal size distribution with an average particle diameter of 75 nm±23
nm. These nanoparticles have short-range order (SRO) of 130 nm in their separation. This result has important implications
for nanomanufacturing with a robust spacing or size selection of nanoparticles in addition to spatial ordering. 相似文献
6.
Jing Bian Laoboyang Zhou Xiaodong Wan Chen Zhu Biao Yang YongAn Huang 《Advanced Electronic Materials》2019,5(7)
It is challenging to manufacture large‐area, ultrathin, flexible/stretchable electronics on an industrial scale. Recent ground‐breaking advances in the manufacture of flexible electronics are based on powerful laser processes. Laser irradiation at an internally absorbing interface through a transparent substrate will bring various physical changes and chemical reactions at the interface, accompanied by distinct phenomena. Numerous techniques derived from these phenomena with the unique ability to fabricate materials, structures, and devices on flexible substrates with the advantages of noncontacting processing, high efficiency, adjustable coverage from micro‐ to macroscale, and compatibility with organic and inorganic materials have been developed. The latest impressive progress in these laser‐based techniques for the production of flexible electronics is reviewed, and the key developments in laser lift‐off, laser‐assisted printing, and laser‐assisted transfer printing techniques are highlighted. The fundamental principles of these techniques are discussed along with their basic mechanisms, followed by an exploration of the latest progress and future prospects in the field. The unique features of these techniques and state‐of‐the‐art applications related to flexible electronics are also highlighted. Finally, the challenges and future prospects of these techniques are explored, from the essential mechanics, engineering efforts, and novel approaches, to comprehensive combinations with innovative fabrication concepts and device structures. 相似文献
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Metallic and dielectric nanoparticles (NPs) have synergistic electromagnetic properties but their positioning into morphologically defined hybrid arrays with novel optical properties still poses significant challenges. A template‐guided self‐assembly strategy is introduced for the positioning of metallic and dielectric NPs at pre‐defined lattice sites. The chemical assembly approach facilitates the fabrication of clusters of metallic NPs with interparticle separations of only a few nanometers in a landscape of dielectric NPs positioned hundreds of nanometers apart. This approach is used to generate two‐dimensional interdigitated arrays of 250 nm diameter TiO2 NPs and clusters of electromagnetically strongly coupled 60 nm Au NPs. The morphology‐dependent near‐ and far‐field responses of the resulting multiscale optoplasmonic arrays are analyzed in detail. Elastic and inelastic scattering spectroscopy in combination with electromagnetic simulations reveal that optoplasmonic arrays sustain delocalized photonic–plasmonic modes that achieve a cascaded E‐field enhancement in the gap junctions of the Au NP clusters and simultaneously increase the E‐field intensity throughout the entire array. 相似文献
9.
Cellular Solids: Three‐Dimensional Printing of Elastomeric,Cellular Architectures with Negative Stiffness (Adv. Funct. Mater. 31/2014) 
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下载免费PDF全文 Eric B. Duoss Todd H. Weisgraber Keith Hearon Cheng Zhu Ward Small IV Thomas R. Metz John J. Vericella Holly D. Barth Joshua D. Kuntz Robert S. Maxwell Christopher M. Spadaccini Thomas S. Wilson 《Advanced functional materials》2014,24(31):5020-5020
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Eric B. Duoss Todd H. Weisgraber Keith Hearon Cheng Zhu Ward Small IV Thomas R. Metz John J. Vericella Holly D. Barth Joshua D. Kuntz Robert S. Maxwell Christopher M. Spadaccini Thomas S. Wilson 《Advanced functional materials》2014,24(31):4905-4913
Three‐dimensional printing of viscoelastic inks to create porous, elastomeric architectures with mechanical properties governed by the ordered arrangement of their sub‐millimeter struts is reported. Two layouts are patterned, one resembling a “simple cubic” (SC)‐like structure and another akin to a “face‐centered tetragonal” (FCT) configuration. These structures exhibit markedly distinct load response with directionally dependent behavior, including negative stiffness. More broadly, these findings suggest the ability to independently tailor mechanical response in cellular solids via micro‐architected design. Such ordered materials may one day replace random foams in mechanical energy absorption applications. 相似文献
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Chao Song Bihui Zou Zhiming Cui Zihe Liang Jaehyung Ju 《Advanced functional materials》2021,31(32):2101395
Thermally triggered active metamaterials with shape memory polymers (SMPs) show greater potential for structural applications with reconfigurability than other programmable structures owing to their temporally stiff condition with shape locking. However, most SMP-based active metamaterials have not shown complex transformation, such as multi-modal and asymmetric deformations, because of the lack of an adaptable strategy with reasonable mechanics models. Moreover, conventional SMP has a critical drawback – irreversible transformability, limiting its reconfigurability for active metamaterials. Herein, a thermomechanical tool that allows a single material system to transform with reversible, multi-modal, and asymmetric deformations is constructed and demonstrated. Using transformation aids (TAs), a localized pre-stress and a temperature-dependent reverse stiffness effect to exchange energy with a lattice is conceived. The deformation of a single SMP system whose energy is swapped from TAs by localized pre-stress and reverse stiffness can transform into reversible, multi-modal, and asymmetric deformations with shape-locking. The methods can be used for reconfigurable structures, tuning symmetry, and chirality, especially for active acoustic metamaterials, deployable devices, and biomedical devices. The mechanics-inspired design approach of local deformation of TA and the interaction with the temperature-dependent stiffness drop of the lattice open an avenue to the robust design of thermally triggered active metamaterials. 相似文献
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Zheren Cai Shengdong Zhao Zhandong Huang Zheng Li Meng Su Zeying Zhang Zhipeng Zhao Xiaotian Hu Yue‐Sheng Wang Yanlin Song 《Advanced functional materials》2019,29(51)
Soft acoustic metamaterials that embed soft materials in a host media have promising applications in aqueous environments. However, the preparation of soft metamaterials under water and realization of low‐frequency soft acoustic metamaterials remains a challenge. By combining 3D printing technology and surface hydrophobic properties, this work presents a general approach to construct 3D soft acoustic metamaterials using bubbles as resonator units. Low‐frequency broadband locally resonant metamaterials can be realized using patterned bubbles with bandgaps that are orders of magnitude wider than other locally resonant metamaterials. In addition, a water‐to‐air ultratransmission metasurface is prepared by patterning a layer of bubbles beneath the water surface, which allows for the ultratransmission of sound across an air–water interface. This strategy opens up promising avenues for many applications based on locally resonant metamaterials such as deep subwavelength acoustic superlenses or negative‐refraction metamaterials. 相似文献
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Xin Xie Xiong Li Mingbo Pu Xiaoliang Ma Kaipeng Liu Yinghui Guo Xiangang Luo 《Advanced functional materials》2018,28(14)
In 1860s, Gustav Kirchhoff proposed his famous law of thermal radiation, setting a fundamental contradiction between the infrared reflection and thermal radiation. Here, for the first time an ultrathin plasmonic metasurface is proposed to simultaneously produce ultralow specular reflection and infrared emission across a broad spectrum and wide incident angle range by combining the low emission nature of metal and the photonic spin–orbit interaction in spatially inhomogeneous structures. As a proof‐of‐concept, a phase gradient metasurface composed of sub‐wavelength metal gratings is designed and experimentally characterized in the infrared atmosphere window of 8–14 µm, demonstrating an ultralow specular reflectivity and infrared emissivity below 0.1. Furthermore, it is demonstrated that infrared illusion could be generated by the metasurface, enabling not only invisibility for thermal and laser detection, but also multifunctionalities for potential applications. This technology is also scalable across a wide range of electromagnetic spectrum and provides a feasible alternative for surface coating. 相似文献
15.
Christabel Choi James Hardwick Shubhi Bansal Sriram Subramanian 《Advanced functional materials》2024,34(49):2404093
Acoustic metamaterials based on out-of-plane actuation can flexibly reconfigure arrayed unit cells on demand, to shape sound fields for applications such as beam formation or holography. However, implementing active reconfiguration on the millimeter-scale is challenging, due to the lack of suitable actuation methods. Besides electronic complexity, current methods suffer from limited actuation range (sub-millimeter), and discrete steps inhibit smooth sound modulation. Here, a novel fluid-driven approach for continuous out-of-plane actuation is presented. A three dimensionally (3D)-printed fluidic chip is integrated with an elastomeric membrane, and selective inflation of membrane sections actuates acoustic reflector unit cells according to their shape and position. The compact device enables displacements >5 mm without coupling mechanisms or external power. It is experimentally demonstrate single-channel and multi-channel prototypes, including an ultrasonic metasurface built for controllable acoustic focusing at five different locations. The fluidic chips are monolithically printed via digital light processing without internal support material, and the membranes are fabricated by accessible and cost-effective spacer-based fabrication. The methods are reproducible and eliminate complex processes (e.g., adhesion of layers) commonly associated with multi-layered micro/milli fluidic devices. The outlined approaches and concepts in this work can be applied beyond the field of metamaterials, such as for visual displays, or tactile devices. 相似文献
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Mechanical metamaterials (MMs) receive widespread attention due to their unprecedented mechanical properties. However, in the next-generation MMs, the cognitive function of information processing can be realized while maintaining superior mechanical properties. Herein, a mechanical metamaterial-based self-powered electronic skin (e-skin) with multimodal fusion perception capability and shape memory reconfigurability is proposed. Benefiting from an MM skeleton and its analytical model, e-skin realizes biomimetic nonlinear mechanical behavior and mechanical reconfigurability to imitate target biotissues. Its integrated perovskite-based elastic sensors enable high-precision collection of physiological movements and auditory, tactile, and precontact distance signals. Further, by imitating the integration and interaction functions in biological multisensory neural networks, the system achieves advanced cognitive functions of acquiring, identifying, and integrating information across modalities. Applications of e-skin are demonstrated in motion monitoring, speech recognition, and somatosensory game operation. These capabilities can be applied to cross-modal perception robot systems based on multisensory neural networks. 相似文献
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掺镱双包层光纤激光器及其在激光加工中的应用 总被引：3，自引：0，他引：3
掺镱双包层光纤激光器是国际上近年来发展的一种新型固体激光器,它具有光束质量好、体积紧凑、效率高等优点。在简要介绍高功率掺镱双包层光纤激光器的原理特点以及发展现状的基础上,讨论了它在激光加工中的应用。 相似文献