- 标题
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- 实验方案
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Self-Assembled Ordered Three-Phase Au-BaTiO <sub/>3</sub> -ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method
摘要： Complex multiphase nanocomposite designs present enormous opportunities for developing next-generation integrated photonic and electronic devices. Here, a unique three-phase nanostructure combining a ferroelectric BaTiO3, a wide-bandgap semiconductor of ZnO, and a plasmonic metal of Au toward multifunctionalities is demonstrated. By a novel two-step templated growth, a highly ordered Au–BaTiO3–ZnO nanocomposite in a unique “nanoman”-like form, i.e., self-assembled ZnO nanopillars and Au nanopillars in a BaTiO3 matrix, is realized, and is very different from the random three-phase ones with randomly arranged Au nanoparticles and ZnO nanopillars in the BaTiO3 matrix. The ordered three-phase “nanoman”-like structure provides unique functionalities such as obvious hyperbolic dispersion in the visible and near-infrared regime enabled by the highly anisotropic nanostructures compared to other random structures. Such a self-assembled and ordered three-phase nanocomposite is obtained through a combination of vapor–liquid–solid (VLS) and two-phase epitaxy growth mechanisms. The study opens up new possibilities in the design, growth, and application of multiphase structures and provides a new approach to engineer the ordering of complex nanocomposite systems with unprecedented control over electron–light–matter interactions at the nanoscale.
关键词： vertically aligned nanocomposites,plasmonics,epitaxial thin films,metamaterials,three-phase nanocomposites,self-assembly
更新于2025-10-22 19:40:53
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Handling Electromagnetic Radiation beyond Terahertz using Chromophores to Transition from Visible Light to Petahertz Technology
摘要： An increase of the operating frequencies of electromagnetic waves leads from the well-established terahertz technology to the visual and reaches petahertz radiation. It is shown that electromagnetic radiation close to petahertz is attractive for technology where knowledge about radio waves can be applied. The dimensions of such radiation are still classically macroscopic; however, molecular components such as resonators were used where quantum mechanics rules have to be considered. Constructions of coupled resonators for energy transfer are as well demonstrated as molecular components for optical metamaterials.
关键词： Dyes,FRET,Energy transfer,Reflectance,Petahertz,Visible light,Resonators,Metamaterials,Terahertz,Electromagnetic radiation
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - Miramar Beach, FL (2018.8.22-2018.8.24)] 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - On using Micron-Sized Silver Coated Particles to Control the Electromagnetic Response of a Metamaterial with Complementary Split Ring Resonators and Wires in a Host Dielectric
摘要： Micron-sized conducting particles that columnize along the magneto-static field lines are used to implement the wires in a traditional split ring resonator/wire metamaterial unit-cell configuration. It is shown that the impedance of the metamaterial can be effectively changed from 1GHz-20GHz by controlling the particle columns.
关键词： CSRR,wave impedance,Metamaterials
更新于2025-09-23 15:23:52
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A Subwavelength Microstrip Resonator Based on Metamaterials
摘要： A metamaterial-based subwavelength microstrip resonator with high quality factor and simple fabrication process was proposed. For the experimental result, a quality factor of about 70 was achieved when the length of the resonator was about one third of the wavelength. Firstly, the mu-negative metamaterial (MNM) and the epsilon-negative metamaterial (ENM) were implemented by loading only chip capacitors or only chip inductors onto the microstrip. The implementation process is simpler in comparison to the traditional implementation method of the MNM and the ENM based on the microstrip. Then, the transmission characteristics of the heterostructure constructed of the MNM and the ENM fabricated through the simple method were investigated and the results showed that a subwavelength microstrip resonator could be built by the MNM–ENM heterostructure. Moreover, the quality-factor enhancement of the subwavelength microstrip resonator based on the MNM–ENM heterostructure was also explored. The results showed that the quality factor could be notably boosted and increased by about 15 times for the experimental result of the sample owing to more intensive con?nement of the electromagnetic ?eld when the electromagnetically induced transparency-like metamaterial was introduced at the interface of the MNM–ENM heterostructure.
关键词： resonator,quality factor,subwavelength,Metamaterials
更新于2025-09-23 15:23:52
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Design of high gain, broadband resonant cavity antenna with meta-material inspired superstrate
摘要： A broadband high gain planar meta-material based Resonant Cavity Antenna (RCA) operating at C-band is proposed. The RCA is modeled using simple ray tracing method. The unit cell metamaterial consists of Artificial Magnetic Conductor (AMC) and square patch laminated on either side of a lossy commercial dielectric material of dielectric constant 4.4 & thickness 1.6mm, is used as the superstrate to design RCA. Square patch is the capacitive type and that AMC as inductive. Effects of the reflection phase of the substrate decide the high gain of the antenna. A cylindrical dielectric resonator antenna (CDRA) is embedded into the cavity as a feed. The proposed antenna achieves 22.4dBi gain with 2 layers of 4x4 array superstrate with a bandwidth of around 5.1GHz. The full-wave analysis is performed to extract the impedance matching, radiation pattern & gain of the composite RCA. A prototype antenna is fabricated and tested for verification of experimental results which was found to be well correlated. It also shows that the proposed RCA achieves -10dB impedance bandwidth of 72.72% ranging from 4 to 9.1GHz with a high gain around 22.4dBi.
关键词： Cylindrical Dielectric Resonator Antenna (CDRA),Metamaterials (MTM),Resonant Cavity Antenna (RCA)
更新于2025-09-23 15:23:52
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Ultra-broadband metamaterial absorber with graphene composites fabricated by 3D printing
摘要： An ultra-broadband electromagnetic (EM) absorber composed of composite metamaterials was designed, fabricated and characterized. Polylactic-acid/reduced graphene oxide (PLA/RGO) composites with different amounts of RGO were prepared as a primary material collection. To provide good impedance matching and efficient wave attenuation, the multilayer absorbers were designed with a gradient index (GRIN) of characteristic impedance by manipulating the RGO content and the geometric parameters of the unit cell. The absorbers with different numbers of layers were fabricated by a material extrusion process, and then the reflection loss (RL) of the prepared samples was measured. Results showed that the methodology for designing a metamaterial absorber with gradient impedance and fabricating through a 3D printing process was effective in producing ultra-broadband absorbers. The seven-layer absorber achieved an absorption above 90% in a broad bandwidth of 4.5–40 GHz. This work could provide inspiration for upgrading the performance of some conventional absorbing composites through a rational design of the composite proportion and structure.
关键词： Microwave absorption,Multilayer structure,3D printing,Composite materials,Metamaterials
更新于2025-09-23 15:23:52
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Investigating flexible band-stop metamaterial filter over THz
摘要： Metamaterial filter is a novel type of photoelectric device. In this study, a triple-band band-stop filter for terahertz is fabricated by magnetron sputtering of periodic metamaterial resonators on flexible polyimide substrates. The band-stop resonant points of the filter are 107.3, 167.45, and 209.9 GHz, and the 3 dB bandwidths are 14.13, 14.03, and 22.44 GHz. S21 parameters at the resonance point reach ?30.217, ?30.432, and ?38.618 dB, thereby possibly achieving an excellent frequency blocking performance. Simultaneously, the stop-band can be adjusted by controlling the length of the metamaterial unit size, thus modifying the frequency of the filter.
关键词： Terahertz wave,Photoelectric device,Band-stop filter,Metamaterials
更新于2025-09-23 15:23:52
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Fano-like resonance in large-area magnetic metamaterials fabricated by nanoimprint technique title
摘要： We experimentally and theoretically investigated the Fano-like resonance in large-area magnetic metasurfaces fabricated by nanoimprint lithography technique based on elaborately designed Ag-SiN-Ag configuration. Asymmetric line shape is revealed in reflection spectrum of the magnetic metamaterials. The physical mechanism is elucidated through dispersion relation and electromagnetic field distribution analysis. Both the measured and calculated dispersion relation tell that there are magnetic resonance modes and surface lattices modes coexisting in the magnetic metamaterials, their coupling leads to the asymmetric profile in the reflection spectrum. The calculated electromagnetic field distribution further consolidate the coupling phenomenon in the magnetic metamaterials. This work might significantly prompt the applications of metamaterials in sensing, lasing, and optical devices designing.
关键词： SPP,magnetic resonance,Fano Resonance,surface lattice resonance,magnetic metamaterials
更新于2025-09-23 15:23:52
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Electromagnetic waves' self-focusing in metamaterials having both LHM and RHM behavior: an application to filter design
摘要： Self-focusing, also known as Talbot’s effect had been widely studied by the scientific community. In this paper we show self-focusing as a coherence propagation phenomenon, in particular we studied self-focusing for a pulse propagating in a metamaterial with both behaviors: left handed material (LHM) and right handed material (RHM). These dual behaviors allow the construction of frequency filters in the range of frequency in which the metamaterial stops behaving as a LHM (negative refraction index) and begins an RHM behavior (positive refraction index). The coherence length (CL) for pulses propagating in these metamaterials seems to be larger when its frequencies are in the LHM region. Finally, we show that the cell’s size turns out to be critical in designing the filter, and as an example we present here four metamaterial cells.
关键词： metamaterials,filters,self-focusing,Coherence propagation
更新于2025-09-23 15:23:52
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Applications of nanostructures in wide-field, label-free super resolution microscopy
摘要： Super resolution imaging capable of resolving details beyond the diffraction limit is highly desired in many scientific and application fields, including bio-medicine, nanomaterial science, and opto-electronic integration. Up to now, many different methods have been proposed, among which wide-field, label-free super resolution microscopy is indispensable due to its good applicability to diverse sample types, large field of view (FOV), and high imaging speed. In recent years, nanostructures have made a crucial contribution to the wide-field, label-free subdiffraction microscopy, with various working mechanisms and configuration designs. This review summarizes the recent applications of the nanostructures in the wide-field, label-free super resolution microscopy, with the emphasis on the designs of hyperlens with hyperbolic dispersion, microsphere with “nano-jets”, and nanowire ring illumination microscopy based on spatial frequency shift effect. The bottlenecks of the current techniques and possible solutions are also discussed.
关键词： spatial resolution,nanowire,metamaterials,optical microscopy
更新于2025-09-23 15:23:52