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101.
基于电磁波的传输矩阵理论,对一维光子晶体在近 红外波段0.85-2.30 μm滤波特性进行了分析研究。由MoS2和半导体超材料AZO/ZnO构成(AB)N型光子晶体,其中AZO/Zn O是掺铝氧化锌层和氧化锌层交替形成的具有人 工周期结构的各项异性材料,在部分近红外波段具有负的折射率。数值分析表明:此结构光 子晶体在0.85-2.30 μm波 段具有四个光子通带;带隙随B层中填充因子h的增大发生蓝移;光子晶体透射 峰的数量由光子晶体周期N决定, 即周期为N时,每个通带透射峰的数量为N-1;通过改变膜层厚 度能实现对透射波长的调控,如增加A层或B层厚 度,透射波中心波长发生红移;而光波入射角度的增加将使透射波中心波长发生蓝移。由超 材料AZO/ZnO构成的光 子晶体的滤波特性为光通信波段多通道可调谐高性能滤波器的设计提供理论参考。 相似文献
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Eric Ashalley Cui-Ping Ma Yi-Song Zhu Hong-Xing Xu Peng Yu Zhi-Ming Wang 《电子科技学刊:英文版》2021,19(3):197-232
Chiral metamaterial absorbers (CMMAs), a particular class of chiral metamaterials that refuse the transmission of incident radiation and exhibit different optical responses upon interactions with left and right circularly polarized (RCP) light, have gained research traction in recent years. CMMAs demonstrate numerous exotic and specialized applications owing to their achievable compatibility with various physical, chemical, and biomolecular systems. Aside from their well-evolved fabrication modalities for a broad range of frequencies, CMMAs exhibit strong chiroptical effects, making them central to various detection, imaging, and energy harvesting applications. Consequently, within the past decade, studies encompassing the design, optimization, and fabrication, as well as demonstrating the diverse applications of CMMAs have emerged. In this review, the theory, design, and fabrication of CMMAs are discussed, highlighting their top-down fabrication techniques as well as recent algorithmic and machine-learning (ML)-based approaches to the design and optimization. Some of their broad-spectrum applications are also discussed, spanning their roles in enantioselective photodetection, chiral imaging, generation of hot electrons, selective temperature sensing, and active chiral plasmonics. 相似文献
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本文通过简单的一步热解法合成了C/Co复合材料,在材料质量填充浓度为35%时观察到其具有优异的介电频散性能。当材料厚度2.5 mm时,该复合材料在11.2 GHz的最小反射率为-23.7 dB,小于-10 dB的带宽为3.8 GHz。为了进一步提高吸收体的吸波性能,我们利用全介质超材料的设计对吸收体的宏观结构进行优化,此方法成功地将小于-10 dB的吸收带宽扩展到15 GHz (7.0~22.0 GHz)。该研究结果可以为高性能微波吸收材料的制备工艺和结构设计提供有价值的参考。 相似文献
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石墨烯太赫兹波段性质及石墨烯基太赫兹器件 总被引:1,自引:0,他引:1
石墨烯在太赫兹波段的优异性质,使其在太赫兹源、太赫兹探测和太赫兹调控三个方面都具备广阔的应用前景。主要对石墨烯在太赫兹波段的性质及石墨烯基太赫兹器件的相关研究进行了综述,并对石墨烯在太赫兹波段的应用前景进行了展望。在石墨烯太赫兹波段性质方面,主要介绍了石墨烯的电导模型、静态和超快光谱响应特性,以及表面太赫兹波辐射特性。在石墨烯基太赫兹器件方面,主要综述了基于光、电、磁调控的太赫兹主动器件,石墨烯基超材料的太赫兹调制器,基于阻抗匹配的减反射调控器件,以及可调太赫兹源器件的最新研究进展。 相似文献
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Aobo Li Xiaoguang Zhao Guangwu Duan Stephan Anderson Xin Zhang 《Advanced functional materials》2019,29(22)
Diatoms are photosynthetic algae that exist ubiquitously throughout the planet in water environments. Over the preceding decades, the diatom exoskeletons, termed frustules, featuring abundant micro‐ and nanopores, have served as the source material and inspiration for myriad research efforts. In this work, it is demonstrated that frustule‐inspired hierarchical nanostructure designs may be utilized in the fabrication of metamaterial absorbers, thereby realizing a broadband infrared (IR) absorber with excellent performance in terms of absorption. In an effort to investigate the origin of this absorption characteristic, numerical models are developed to study these structures, revealing that the hierarchical organization of the constituent nanoparticulate metamaterial unit cells introduce an additional resonance mode to the device, broadening the absorption spectrum. It is further demonstrated that the resonant peaks shift linearly as a function of inter‐unit‐cell spacing in the metamaterial, which is attributed to the induced collective dipole mode by the nanoparticles. Ultimately, the work herein represents an innovative perspective in terms of the design and fabrication of IR absorbers inspired by naturally occurring biomaterials, offering the potential to lead to advances in metamaterial absorber technology. 相似文献
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超材料指的是一些具有人工设计的结构,并呈现出自然材料所不具备的超常物理性质,它能够以一种新奇的方式实现对电磁波的调控。文中理论研究了单缝双环结构超材料太赫兹调制器的调制机理,运用等效电路法及微分方程法求解出调制器的共振频率与调制器本身几何参数的一般数学表达式,并用Matlab 对不同调制频率情况下的几何参数进行了计算。运用CST(microwave studio)对调制器进行了理论模拟,数值模拟结果显示,该调制器频率在0.775 THz,0.95 THz 和1.65 THz 处共振吸收强度分别为70%,65%和68%,该结构调制器可以作为太赫兹波的调制器。 相似文献
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提出一种基于材料相变的穿孔型带隙可调声子晶体结构.其结构形式为含缝隙的形状记忆合金和环氧树脂的组合体,通过温度变化诱发相变引起的形状记忆合金材料性质的变化,实现声子晶体的带隙变化;通过合理布置缝隙与形状记忆合金相变材料的位置,实现声子晶体带隙性质的可调设计.基于有限元方法,建立了可调声子晶体的分析模型,分析了形状记忆合... 相似文献