共查询到20条相似文献，搜索用时 0 毫秒
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Jun Zhao Chunjie Zhang Paul V. Braun Harald Giessen 《Advanced materials (Deerfield Beach, Fla.)》2012,24(35):OP247-OP252
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Seok Kim Howon Jung Yongwoo Kim Jinhee Jang Jae W. Hahn 《Advanced materials (Deerfield Beach, Fla.)》2012,24(44):OP337-OP344
A theoretical model is introduced to evaluate the ultimate resolution of plasmonic lithography using a ridge aperture. The calculated and experimental results of the line array pattern depth are compared for various half pitches. The theoretical analysis predicts that the resolution of plasmonic lithography strongly depends on the ridge gap, achieving values under 1x nm with a ridge gap smaller than 10 nm. A micrometer‐scale circular contact probe is fabricated for high speed patterning with high positioning accuracy, which can be extended to a high‐density probe array. Using the circular contact probe, high‐density line array patterns are recorded with a half pitch up to 22 nm and good agreement is obtained between the theoretical model and experiment. To record the high density line array patterns, the line edge roughness (LER) is reduced to ≈17 nm from 29 nm using a well‐controlled developing process with a smaller molecular weight KOH‐based developer at a temperature below 10°C. 相似文献
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Seok Kim Howon Jung Yongwoo Kim Jinhee Jang Jae W. Hahn 《Advanced materials (Deerfield Beach, Fla.)》2012,24(44):OP273-OP273
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Leo T. Varghese Li Fan Yi Xuan Chookiat Tansarawiput Sangsik Kim Minghao Qi 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(22):3778-3783
Metal nanostructures are the main building blocks of metamaterials and plasmonics which show many extraordinary properties not existing in nature. A simple and widely applicable method that can directly pattern metals with silicon molds without the need of resists, using pressures of <4 MPa and temperatures of 25–150 °C is reported. Three‐dimensional structures with smooth and vertical sidewalls, down to sub‐10 nm resolution, are generated in silver and gold films in a single patterning step. Using this nanopatterning scheme, large‐scale vivid images through extraordinary optical transmission and strong surface‐enhanced Raman scattering substrates are realized. Resistless nanoimprinting in metal (RNIM) is a new class of metal patterning that allows plasmonic nanostructures to be fabricated quickly, repeatedly, and at a low‐cost. 相似文献
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Frank Neubrech Mario Hentschel Na Liu 《Advanced materials (Deerfield Beach, Fla.)》2020,32(41):1905640
Molecular chirality is a geometric property that is of great importance in chemistry, biology, and medicine. Recently, plasmonic nanostructures that exhibit distinct chiroptical responses have attracted tremendous interest, given their ability to emulate the properties of chiral molecules with tailored and pronounced optical characteristics. However, the optical chirality of such human-made structures is in general static and cannot be manipulated postfabrication. Herein, different concepts to reconfigure the chiroptical responses of plasmonic nano- and micro-objects are outlined. Depending on the utilized strategies and stimuli, the chiroptical signature, the 3D structural conformation, or both can be reconfigured. Optical devices based on plasmonic nanostructures with reconfigurable chirality possess great potential in practical applications, ranging from polarization conversion elements to enantioselective analysis, chiral sensing, and catalysis. 相似文献
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Meneses-Rodríguez D Ferreiro-Vila E Prieto P Anguita J González MU García-Martín JM Cebollada A García-Martín A Armelles G 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(23):3317-3323
A Co nanolayer is used as a local probe to evaluate the vertical inhomogeneous distribution of the electromagnetic (EM) field within a resonant metallic nanodisk. Taking advantage of the direct relation between the magneto-optical activity and the electromagnetic field intensity in the Co layer, it is shown that the nonuniform EM distribution within the nanodisk under plasmon resonant conditions has maximum values close to the upper and lower flat faces, and a minimum value in the middle. 相似文献
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Zhaolong Cao Han Gao Meng Qiu Wei Jin Shaozhi Deng Kwok-Yin Wong Dangyuan Lei 《Advanced materials (Deerfield Beach, Fla.)》2020,32(41):1907151
Determining the structural chirality of biomolecules is of vital importance in bioscience and biomedicine. Conventional methods for characterizing molecular chirality, e.g., circular dichroism (CD) spectroscopy, require high-concentration specimens due to the weak electronic CD signals of biomolecules such as amino acids. Artificially designed chiral plasmonic metastructures exhibit strong intrinsic chirality. However, the significant size mismatch between metastructures and biomolecules makes the former unsuitable for chirality-recognition-based molecular discrimination. Fortunately, constructing metallic architectures through molecular self-assembly allows chirality transfer from sub-nanometer biomolecules to sub-micrometer, intrinsically achiral plasmonic metastructures by means of either near-field interaction or chirality inheritance, resulting in hybrid systems with CD signals orders of magnitude larger than that of pristine biomolecules. This exotic property provides a new means to determine molecular chirality at extremely low concentrations (ideally at the single-molecule level). Herein, three strategies of chirality transfer from sub-nanometer biomolecules to sub-micrometer metallic metastructures are analyzed. The physiochemical mechanisms responsible for chirality transfer are elaborated and new fascinating opportunities for employing plasmonic metastructures in chirality-based biosensing and bioimaging are outlined. 相似文献
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Ventsislav K. Valev Jeremy J. Baumberg Concita Sibilia Thierry Verbiest 《Advanced materials (Deerfield Beach, Fla.)》2013,25(18):2517-2534
Strong chiroptical effects recently reported result from the interaction of light with chiral plasmonic nanostructures. Such nanostructures can be used to enhance the chiroptical response of chiral molecules and could also significantly increase the enantiomeric excess of direct asymmetric synthesis and catalysis. Moreover, in optical metamaterials, chirality leads to negative refractive index and all the promising applications thereof. In this Progress Report, we highlight four different strategies which have been used to achieve giant chiroptical effects in chiral nanostructures. These strategies consecutively highlight the importance of chirality in the nanostructures (for linear and nonlinear chiroptical effects), in the experimental setup and in the light itself. Because, in the future, manipulating chirality will play an important role, we present two examples of chiral switches. Whereas in the first one, switching the chirality of incoming light causes a reversal of the handedness in the nanostructures, in the second one, switching the handedness of the nanostructures causes a reversal in the chirality of outgoing light. 相似文献
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Ruggero Verre Lei Shao Nils Odebo Länk Pawel Karpinski Andrew B. Yankovich Tomasz J. Antosiewicz Eva Olsson Mikael Käll 《Advanced materials (Deerfield Beach, Fla.)》2017,29(29)
High‐refractive‐index silicon nanoresonators are promising low‐loss alternatives to plasmonic particles in CMOS‐compatible nanophotonics applications. However, complex 3D particle morphologies are challenging to realize in practice, thus limiting the range of achievable optical functionalities. Using 3D film structuring and a novel gradient mask transfer technique, the first intrinsically chiral dielectric metasurface is fabricated in the form of a monolayer of twisted silicon nanocrescents that can be easily detached and dissolved into colloidal suspension. The metasurfaces exhibit selective handedness and a circular dichroism as large as 160° µm?1 due to pronounced differences in induced current loops for left‐handed and right‐handed polarization. The detailed morphology of the detached particles is analyzed using high‐resolution transmission electron microscopy. Furthermore, it is shown that the particles can be manipulated in solution using optical tweezers. The fabrication and detachment method can be extended to different nanoparticle geometries and paves the way for a wide range of novel nanophotonic experiments and applications of high‐index dielectrics. 相似文献
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Metamaterials: Nonlinear Superchiral Meta‐Surfaces: Tuning Chirality and Disentangling Non‐Reciprocity at the Nanoscale (Adv. Mater. 24/2014) 
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下载免费PDF全文 V. K. Valev J. J. Baumberg B. De Clercq N. Braz X. Zheng E. J. Osley S. Vandendriessche M. Hojeij C. Blejean J. Mertens C. G. Biris V. Volskiy M. Ameloot Y. Ekinci G. A. E. Vandenbosch P. A. Warburton V. V. Moshchalkov N. C. Panoiu T. Verbiest 《Advanced materials (Deerfield Beach, Fla.)》2014,26(24):3982-3982
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V. K. Valev J. J. Baumberg B. De Clercq N. Braz X. Zheng E. J. Osley S. Vandendriessche M. Hojeij C. Blejean J. Mertens C. G. Biris V. Volskiy M. Ameloot Y. Ekinci G. A. E. Vandenbosch P. A. Warburton V. V. Moshchalkov N. C. Panoiu T. Verbiest 《Advanced materials (Deerfield Beach, Fla.)》2014,26(24):4074-4081
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Ogaki R Cole MA Sutherland DS Kingshott P 《Advanced materials (Deerfield Beach, Fla.)》2011,23(16):1876-1881
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In recent years, optical chirality of plasmonic nanostructures has aroused great interest because of innovative fundamental understanding as well as promising potential applications in optics, catalysis and sensing. Herein, state‐of‐the‐art studies on circular dichroism (CD) characteristics of plasmonic nanostructures are summarized. The hybrid of achiral plasmonic nanoparticles (NPs) and chiral molecules is explored to generate a new CD response at the plasmon resonance as well as the enhanced CD intensity of chiral molecules in the UV region, owing to the Coulomb static and dynamic dipole interactions between plasmonic NPs and chiral molecules. As for chiral assembly of plasmonic NPs, plasmon–plasmon interactions between the building blocks are found to induce generation of intense CD response at the plasmon resonance. Three‐dimensional periodical arrangement of plasmonic NPs into macroscale chiral metamaterials is further introduced from the perspective of negative refraction and photonic bandgap. A strong CD signal is also discerned in achiral planar plasmonic nanostructures under illumination of circular polarized plane wave at oblique incidence or input vortex beam at normal incidence. Finally perspectives, especially on future investigation of time‐resolved CD responses, are presented. 相似文献
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Mianqi Xue Xiaojing Cai Ghenfu Chen 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(5):548-552
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