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Beam Deflectors: High‐Performance Broadband Circularly Polarized Beam Deflector by Mirror Effect of Multinanorod Metasurfaces (Adv. Funct. Mater. 34/2015) 
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下载免费PDF全文 Zhaocheng Liu Zhancheng Li Zhe Liu Jianxiong Li Hua Cheng Ping Yu Wenwei Liu Chengchun Tang Changzhi Gu Junjie Li Shuqi Chen Jianguo Tian 《Advanced functional materials》2015,25(34):5567-5567
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Zhaocheng Liu Zhancheng Li Zhe Liu Jianxiong Li Hua Cheng Ping Yu Wenwei Liu Chengchun Tang Changzhi Gu Junjie Li Shuqi Chen Jianguo Tian 《Advanced functional materials》2015,25(34):5428-5434
Manipulation of light phase and amplitude by plasmonic metasurfaces has immensely promising applications in optical imaging, information processing, communications, and quantum optics. However, the controllability of efficiency and bandwidth is relatively low for the single‐layer metasurfaces. Here, a high efficiency and broadband circularly polarized (CP) beam deflector based on multirod single‐layer metasurfaces is presented. Each unit can be regarded as an imperfect polarizer, and the phase and amplitude induced by the mirror effect can be easily controlled. Owing to the plasmonic hybridization, the high efficiency and broadband characteristics of the proposed metasurfaces are theoretically and experimentally demonstrated. Meanwhile, an easy way to determine the polarization degree of the incident light based on Poincaré sphere is also proved by the multirod metasurfaces. Our work provides a simple alternative way to enhance the efficiency of CP anomalous light and thus has robust applications in nanophotonics and nanooptics. 相似文献
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Chen Xi Huang Jingjing Zhang Qiang Cheng Tie Jun Cui 《Advanced functional materials》2021,31(36):2103379
As an alternative to conventional wireless communication techniques that use amplitude, frequency, and phase modulations, polarization modulation (PoM) provides an additional degree of freedom for the modulation of carrier waves and allows the realization of simple transceiver designs. PoM also enhances physical-layer security in wireless communication systems owing to its vector-attribute and direction-dependence features. In this study, a prototype of PoM wireless communications based on a digital coding metasurface that can dynamically control the polarization of electromagnetic waves in a certain frequency band is demonstrated. The binary digital signals can be encoded on the optical rotation states of the circularly polarized beams through the real-time control of the bias voltages applied on the metasurface and successfully decoded at the receiving end. Because the metasurface is separated from the emitting antenna, the design can simplify the setup for multichannel communications and provide more flexibility by setting the emitting antennas at different operating frequencies at any time. 相似文献
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相位梯度超表面可在其表面形成额外的平行波矢分量,从而可对反射波的反射方向进行调控,导致反常反射现象。主要研究在垂直入射情况下通过反射超表面实现对电磁波的反常反射,首先阐明了反射超表面的设计原理,得到了反射超表面的设计理论,并设计了基于开口谐振环的反常反射超表面。仿真和测试结果表明,通过优化设计不同结构参数的开口谐振环阵列单元,可以在设计频点处通过超表面平行波矢控制电磁波的反射方向,将反射波偏折到设计方向。由于其对电磁波反射方向的自由调控,反射超表面在天线、隐身等领域具有重要的应用前景,可望应用于高方向性天线、雷达散射截面缩减、反射聚焦平板等。 相似文献
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Aleksandrs Leitis Andreas Heßler Sophia Wahl Matthias Wuttig Thomas Taubner Andreas Tittl Hatice Altug 《Advanced functional materials》2020,30(19)
Low‐loss nanostructured dielectric metasurfaces have emerged as a breakthrough platform for ultrathin optics and cutting‐edge photonic applications, including beam shaping, focusing, and holography. However, the static nature of their constituent materials has traditionally limited them to fixed functionalities. Tunable all‐dielectric infrared Huygens' metasurfaces consisting of multi‐layer Ge disk meta‐units with strategically incorporated non‐volatile phase change material Ge3Sb2Te6 are introduced. Switching the phase‐change material between its amorphous and crystalline structural state enables nearly full dynamic light phase control with high transmittance in the mid‐IR spectrum. The metasurface is realized experimentally, showing post‐fabrication tuning of the light phase within a range of 81% of the full 2π phase shift. Additionally, the versatility of the tunable Huygen's metasurfaces is demonstrated by optically programming the spatial light phase distribution of the metasurface with single meta‐unit precision and retrieving high‐resolution phase‐encoded images using hyperspectral measurements. The programmable metasurface concept overcomes the static limitations of previous dielectric metasurfaces, paving the way for “universal” metasurfaces and highly efficient, ultracompact active optical elements like tunable lenses, dynamic holograms, and spatial light modulators. 相似文献
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Ben-Xin Wang Chongyang Xu Guiyuan Duan Wei Xu Fuwei Pi 《Advanced functional materials》2023,33(14):2213818
Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed. 相似文献
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Yajie Mu;Dexiao Xia;Jiaqi Han;Xiangjin Ma;Xin Wang;Haixia Liu;Long Li; 《Advanced functional materials》2024,34(46):2407802
The integrated design of radiation and stealth holds significant importance for radar communication and camouflage. Currently, radar systems primarily rely on radomes for off-band stealth. However, achieving in-band stealth by radomes and absorbing materials is challenging. Even more challenging is the dynamic control of both in-band radiation and stealth. Therefore, a novel space-time-coding metasurface is proposed for radiation and stealth modes regulation. By adjusting the two PIN diodes loaded on the meta-atom, switching between radiation and scattering modes can be achieved. A 1-bit reflection phase can be achieved in the scattering mode. The stealth is achieved by controlling the scattering properties of the metasurface. In the radiation mode, 2-bit phase modulation is achieved by separately controlling the PIN diodes on the meta-atom and the 3 dB coupler. Additionally, by varying the size of the meta-atom in the y-polarization direction, a 1-bit reflection phase also can be achieved. To validate the proposed radiation-stealth metasurface characteristics, a 12 × 12 prototype is fabricated. This prototype demonstrates important functionalities, including dual-mode radiation, amplitude-phase co-modulation space-time-coding stealth, and space-coding stealth. 相似文献
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超宽带相位梯度超表面设计 总被引：1，自引：0，他引：1
设计了一种超宽带相位梯度超表面,在电磁波垂直照射条件下能够在15 ~20 GHz 频段内观察到明显的奇异反射现象。提出了一种双“工冶型亚波长结构的单元,且不同尺寸单元的反射相位差在设计频段内基本保持不变,保证了其超宽带工作。利用该单元设计了单元数为31′30, 尺寸为186 mm′180 mm 的相位梯度超表面,并在15 GHz, 17.5 GHz, 20 GHz 3 个频点观察到了明显的奇异反射现象,验证了所设计超表面的宽带特性。最后,对该超表面进行了加工并测试,测试结果与仿真结果吻合良好。 相似文献
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Qingwei Wang Xueqian Zhang Quan Xu Xi Feng Yongchang Lu Li Niu Xieyu Chen Eric Plum Jianqiang Gu Quanlong Yang Ming Fang Zhixiang Huang Shuang Zhang Jiaguang Han Weili Zhang 《Advanced functional materials》2023,33(29):2300639
Generation and manipulation of terahertz (THz) waves are of vital importance for advancing THz technology. Nonlinear metasurfaces allow effective integration of both processes into a single compact device. However, such existing THz devices commonly rely on utilizing a single meta-atom, which has fixed THz generation properties and thus limits the range of achievable functionalities. Here, it is demonstrate how coupling between different meta-atoms within the unit-cell can be used as a degree of freedom for controlling nonlinear THz generation, where achiral coupling provides full control over the amplitude of the generated THz field, while chiral coupling makes the THz generation sensitive to the handedness of the pump polarization. In particular, chiral coupling allows the realization of multiplexed pump-handedness-selective nonlinear metasurfaces, which is illustrated experimentally by selectively generating THz beams with different orbital angular momentum with a single nonlinear metasurface. This approach provides opportunities for developing various integrated nonlinear THz devices. 相似文献
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合成了大螺旋扭曲力的手性化合物4,4'-2(戊基-环己基)苯甲酸异山梨醇酯(ISBB)。对60.0μm厚ISBB/液晶性单体/向列相液晶/光引发剂复合体系的液晶层的上、下表面温度施加不同温度,液晶层中形成了温度梯度。由于高温区域的液晶溶解ISBB的能力强,低温区域的ISBB会向高温区域扩散,从而在液晶薄层中形成了ISBB的浓度梯度与螺距梯度。紫外光聚合复合体系中的光可聚合单体,单体间交联聚合形成网络固定住了液晶层内的螺距梯度,从而制备出反射可见光波段的右旋圆偏振光的宽波反射液晶薄膜。 相似文献
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The dual‐functional and/or multifunctional devices have huge fascinations and prospects to conveniently integrate complex systems with low costs. However, most of such devices are based on anisotropic media or anisotropic structures. Here, a new method is proposed to design planar dual‐functional devices using an isotropic holographic metasurface, in which two different functions are written on the same holographic interference pattern with no mutual coupling. When the metasurface is excited by two orthogonally ported sources, the corresponding dual functions can be controlled by the object waves, which are not affected by each other due to suppression of mutual interference. The proposed metasurface is composed of subwavelength‐scale isotropic metallic patches on a grounded dielectric. In this specific design, double‐beam and double‐polarization radiate devices are realized independently by the orthogonal excitations. Based on the theoretical analysis, scanning radiate beams that are only controlled by frequency with different performances under orthogonal polarizations are demonstrated. To the best of our knowledge, this is the first time for actualizing dual‐functional devices using isotropic textures. Full‐wave simulations and experimental results in the microwave frequencies are presented to validate the proposed theory and confirm the corresponding physical phenomena. 相似文献
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手征向列相(N*)液晶能够选择性反射入射光,但其反射波宽一般小于150nm。利用负介电各向异性的向列相液晶SLC10V513-200与手性化合物R1011、CB15配制出5种N*液晶,其反射波长能够覆盖整个可见光波段。使用异佛尔酮二异氰酸酯(IPDI)界面聚合法制备出平均粒径为8.0μm的5种N*液晶聚脲微胶囊之后,将相同质量的5种微胶囊混入OP-10与IPDI中制备出微胶囊的凝胶。对80.0μm厚微胶囊凝胶薄膜施加交流电场,使微胶囊中的液晶处于平面织构状态,紫外固化微胶囊中的液晶性单体,固定微胶囊中N*液晶的平面织构,从而制备出可以反射可见光波段的微胶囊凝胶薄膜。 相似文献
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