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- 实验方案
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Stretchable and Higha??Adhesive Plasmonic Metasheet Using Al Subwavelength Grating Embedded in an Elastomer Nanosheet
摘要： Plasmonic metasurfaces have attracted much attention for use in device applications over the past decade. Dynamic color tuning (DCT), where the displacement of periodic nanostructures is controlled to generate different colors in real time, is one of the great possibilities of plasmonic metasurfaces for optical strain sensors or display devices. In this study, an Al metasurface embedded in an elastomer nanosheet with film thickness 400 nm is fabricated by means of sacrificial release using a polyvinyl alcohol sacrificial layer. This plasmonic metasheet shows not only the seven colors produced by surface plasmons, but also DCT by stretching the elastomer nanosheet. Each pixel, designed with a grating period of 300–600 nm, emits the bright colors expected in electromagnetic simulation. Moreover, stretching the plasmonic metasheet demonstrates DCT from 495 to 660 nm in the visible light range. The freestanding metasheet with maximum thickness 400 nm may be easily integrated into any active device by post-processing transfer. Stretching the metasheet requires an estimated × 10?3 lower force than previously reported for plasmonic metasurfaces, owing to a film thickness of only several hundreds of nanometers. These results facilitate the realization of microdevices with novel capabilities based on plasmonic metamaterials.
关键词： plasmonic metamaterials,elastomer nanosheets,dynamic color tuning,subwavelength gratings,surface plasmons
更新于2025-09-23 15:21:01
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Born-Kuhn model for magnetochiral effects
摘要： This study focuses on theoretical and numerical investigations of the magnetochiral (MCh) effect in the optical region. Electrodynamics in a medium with broken time and space inversions is described by two orthogonal coupled oscillators, in what is known as the Born-Kuhn model, subject to an external static magnetic field. Constitutive equations and the refractive index of the medium are theoretically derived. The results show that the MCh effect is induced even in the absence of an intrinsic interaction between the magneto-optical effect and the optical activity. The study also numerically investigates the electromagnetic response in a metamaterial with magnetism and chirality in the deep ultraviolet region. The results agree well with the main results of our theory. This paper paves the way to realizing MCh metamaterials in the optical region.
关键词： optical activity,magnetochiral effect,metamaterials,Born-Kuhn model,magneto-optical effect
更新于2025-09-23 15:21:01
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Solitons in nonlinear directional couplers with optical metamaterials by exp(??Φ(ξ))-expansion
摘要： This paper studies solitons in optical couplers that are made up from metamaterials. Twin core as well as multiple-core couplers are considered. The study is conducted by the aid of exp(? Φ(ξ))-expansion scheme for four forms of nonlinearity and they are Kerr law, power law, parabolic law and dual-power law. Singular and combo-soliton solutions are recovered from this algorithm.
关键词： Solitons,exp(? ?(ξ))-Expansion,Optical metamaterials,Optical couplers
更新于2025-09-23 15:21:01
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Tunable quad-band transmission response, based on single-layer metamaterials
摘要： We investigated the electromagnetically induced transparency (EIT)-like effects in planar metamaterials (MMs) at microwave (GHz) frequencies. The specific MMs that were used in this study consist of cut-wire resonator/ring resonator, which achieved the dual EIT-like effects in a single-layer through the bright- and quasi-dark-mode coupling and the lattice mode coupling. In addition, by varying the distance between the two resonators, the quad-band EIT spectral response in the microwave region was obtained, and the group refractive index at the EIT-like resonance of proposed design reached up to 4,000. This study provides the design approach to the multispectral EIT-like effects and might suggest potential applications in a variety of fields, for example, low-loss slow-light device, multiple switching sensor, and other sensing devices.
关键词： microwave frequencies,slow-light device,quad-band transmission,electromagnetically induced transparency,metamaterials
更新于2025-09-23 15:21:01
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[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Detection of Human Tumor Markers with THz Metamaterials
摘要： THz bioanalytical techniques are already proven as a viable tool for the label-free detection of biomolecules. But still, significant improvement of THz sensing techniques is needed to reach application relevant sensitivity levels. We present the label-free THz sensing of human tumor markers using a highly sensitive metamaterial based THz biosensor. High affinity binding of the specific protein to DNA is utilized for localized functionalization to further enhance the detection sensitivity.
关键词： tumor markers,DNA-protein interaction,THz sensing,metamaterials,biosensor
更新于2025-09-23 15:21:01
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Enhanced circular dichroism in hybrid graphenea??metal metamaterials at the near-infrared region
摘要： Strong circular dichroism (CD) effect has gained great interest in nano-optical sensing and detection due to its desirable applications. In this work, we theoretically demonstrate that CD effects can be extremely enhanced in hybrid graphene–metal metamaterials at the near-infrared region. Benefiting from the strong coupling between graphene sheets and chiral metal nanocrystals, the maximum peak value of CD responses can be reached at 9.2% and the other peak value is more than twice as much as the without-graphene systems. When there is one more graphene layer covered on the chiral nanocrystals, the CD responses increase further. For single-layer graphene nanoribbons covered on the spacer, the CD response increases with the increasing filling ratio. The simulation results show that the CD response decreases rapidly with the increase of the distance between the chiral nanocrystals and the graphene sheet. Besides, with the increase of the thickness of the spacer, two CD resonance peaks, one increases faster and the other goes from decreasing to increasing compared with the without-graphene systems. Overall, we can greatly enhance CD effects in the near-infrared region by adding graphene layers, which can provide potential applications in the fields of biosensing and optoelectronic devices.
关键词： Plasmonic resonance,Graphene–metal metamaterials,Near-infrared region,Circular dichroism
更新于2025-09-23 15:19:57
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Optoplasmonics: basic principles and applications
摘要： Plasmonic and photonic elements often have complementary optical properties, motivating the development of ‘optoplasmonic’ hybrid systems in which the photonic and plasmonic elements can synergistically interact. The overall goal in the design of optoplasmonic structures is to overcome the limitations of the individual building blocks or to generate entirely new properties that reach beyond what is possible with conventional photonic or plasmonic structures. After providing a brief introduction into the relevant optical properties of plasmonic and photonic building blocks, this manuscript reviews optoplasmonic architectures that contain plasmonic nanoantennas embedded in a de?ned photonic environment generated by discrete dielectric nanoparticles (NPs), microcavities, waveguides, or photonic crystals, as well as all-metal NP or metal/dielectric NP hybrid arrays in which diffracted modes interact with the plasmons of metal NPs. The fundamental working principles of these optoplasmonic systems are analyzed and selected applications and fabrication strategies are discussed.
关键词： metamaterials,metasurface,sensing,hybrid materials,high refractive index dielectrics,plasmonics,nanophotonics
更新于2025-09-23 15:19:57
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Ultrashort waveguide tapers based on Luneburg lens
摘要： In integrated photonic circuits, silicon-on-insulator waveguides with different geometries have been employed to realize a variety of components. Therefore, efficient coupling of two different waveguides is crucial. In this paper, focusing property of the Luneburg lens is exploited to design waveguide tapers. The Luneburg lens, truncated in a shape of a parabolic taper with reduced footprint, is utilized to connect a 10 μm-wide waveguide to a 0.5 μm one with the same thickness with an average coupling loss of 0.35 dB in the entire O, E, S, C, L, and U bands of optical communications. The proposed compact taper with the length of 11 μm is implemented by varying the thickness of the guiding layer and compared with three conventional tapers with the same length. However, designing a coupler to connect waveguides with different thicknesses and widths is more challenging. By applying quasi-conformal transformation optics, we flatten the Luneburg lens and consequently increase the refractive index on the flattened side. As a result, we are able to couple two waveguides with different thicknesses and widths. The numerical simulations are used to evaluate the theoretically designed tapers. To our knowledge, this is the first study presenting ultrashort tapers based on truncated Luneburg lens.
关键词： Silicon-on-insulator,Waveguide taper,Metamaterials,Luneburg lens
更新于2025-09-23 15:19:57
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Overview of Synthetic Methods to Prepare Plasmonic Transition Metal Nitride Nanoparticles
摘要： The search for new plasmonic materials that are low-cost, chemically and thermally stable, and exhibit low optical losses has garnered significant attention among researchers. Recently, metal nitrides have emerged as promising alternatives to conventional, noble metal based plasmonic materials such as Ag and Au. Many of the initial studies on metal nitrides have focused on computational prediction of the material plasmonic properties. In recent years, several synthetic methods have been developed, enabling empirical analysis. This review highlights synthetic techniques for the preparation of plasmonic metal nitride nanoparticles which are predominantly free-standing using solid-state and solid-gas phase reactions, non-thermal and arc plasma methods, and laser ablation. The physical properties of the nanoparticles such as shape, size, crystallinity, and optical response obtained with such synthetic methods are also summarized.
关键词： Plasmonics,nanoparticles,next-generation materials,transition metal nitrides,metamaterials
更新于2025-09-23 15:19:57
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Robustness of Optical Response for Selfa??Assembled Plasmonic Metamaterials with Morphological Disorder and Surface Roughness
摘要： Bottom-up fabrication of metallized biotemplated nanostructures to form specific plasmonic nanoresonators holds promise as a means of achieving large-scale optical metamaterials. However, in contrast to top-down methods, the stochastic growth of self-assembled nanoresonators is prone to significant disorder and surface roughness, which naturally raise an important question about the robustness of their resonant properties in terms of structural imperfections. An aggregated-random-sphere model is developed to mimic the nucleated growth of metallized DNA origami assembly, leading to meta-atoms with realistic, experimentally observed morphological disorder and surface roughness. Using the well-known split-ring-resonator (SRR) motif as an example, the resonant properties of meta-atoms under different levels of roughness are investigated and a strong tolerance of optical response against morphological disorder is revealed. It is found that in SRRs, even with dramatic roughness introduced, the expected resonances are still observed, despite broadening line shapes compared to ideal smooth structure. Only for extreme disorder, which causes drastic segmentation of SRRs, does the resonant response disappear. The demonstrations are very encouraging for the prospects of bottom-up fabrication toward versatile functional metamaterials and metadevices.
关键词： self-assembly,DNA origami,metamaterials,metasurfaces,surface roughness,morphological disorder
更新于2025-09-23 15:19:57