Photonics and Nanostructures-Fundamentals and Applications最新文献

Interlayer topological edge states and converters based on trilayer valley photonic crystals 基于三层谷光子晶体的层间拓扑边缘态和变换器

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-29 DOI: 10.1016/j.photonics.2026.101517

Shanqi Yang , Xiangke Li , Xingchen Zhao , Xinhui Fu , Lingqi Li , Weijin Kong , Kun Zhang

Topological photonic crystals are crucial for the design of waveguides due to their robust communication capabilities. The introduction of layer pseudospin enriches the dispersion engineering capability, achieving prospective applications for the interlayer conversion. We explore the properties of trilayer valley photonic crystals (VPCs) and classify them according to the symmetry of adjacent layers. Breaking the inversion symmetry and keeping the mirror symmetry, trilayer-mixed states are obtained. On the contrary, breaking the mirror symmetry of the adjacent bilayer, bilayer-mixed and layer-polarized states are achieved. As a result, the middle layer serves as a bridge enhancing the wave coupling between the upper and lower layers. Combining the aforementioned edge states, two kinds of interlayer converters are constructed. One converter has functions of interlayer beam splitter and combiner, expanding the wave manipulation functions in three-dimensional space. The other one converts wave from the lower layer to the upper layer, increasing the vertical switching distance of interlayer conversion. Both converters show good robustness to the geometric defects compared with traditional waveguide structures. The trilayer VPCs not only enrich the topological phases of layered structures, but also expand the regulation dimensions and spatial scales. Such versatile and robust performance offers an alternative approach to manipulating light for the development of integrated photonics, such as optical routing and 3D interferometers.

由于拓扑光子晶体具有强大的通信能力，因此对波导设计至关重要。层伪自旋的引入丰富了色散工程能力，实现了层间转换的远景应用。研究了三层谷光子晶体的性质，并根据相邻层的对称性对其进行了分类。在保持镜面对称的同时打破了反演对称性，得到了三层混合态。相反，破坏相邻双层的镜像对称，实现双层混合和层极化态。因此，中间层起到了桥梁的作用，加强了上下两层之间的波耦合。结合上述边缘状态，构造了两种层间变换器。一种变换器具有层间分束器和合并器的功能，扩展了三维空间的波操纵功能。另一层将波从下层转换到上层，增加了层间转换的垂直切换距离。与传统波导结构相比，两种变换器对几何缺陷都具有较好的鲁棒性。三层vpc不仅丰富了层状结构的拓扑相，而且扩展了调控维度和空间尺度。这种多功能和强大的性能为集成光子学的发展提供了一种操纵光的替代方法，例如光路由和3D干涉仪。

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引用次数: 0

Incorporation of ZnSnN₂ and InN δ-layers in InGaN/GaN Quantum Wells: Toward efficient long-wavelength III-nitride LEDs 在InGaN/GaN量子阱中掺入znsnn2和InN δ-层：制备高效长波iii -氮化led

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-24 DOI: 10.1016/j.photonics.2026.101518

Anup Gorai

The realization of efficient red–infrared emission in InₓGa₁₋ₓN/GaN quantum well (QW) light emitting diodes (LEDs) remains challenging due to strong polarization fields that spatially separate electron and hole wave functions, thereby reducing radiative recombination efficiency. In this work, InGaN/GaN QW structures incorporating δ-ZnSnN₂ and δ-InN layers at the well center are proposed to mitigate this limitation. Numerical analysis shows that the electron–hole overlap (Meh) increases nearly threefold compared to conventional InGaN/GaN QWs, enabling efficient red emission. Further optimization of δ-layer thickness drives the emission into the infrared regime. The dependence of emission wavelength and Meh on current density is systematically investigated for both red and infrared operation. The proposed structures achieve spontaneous radiative recombination rates over sixfold higher than conventional designs and radiative efficiencies exceeding 50 %. These results demonstrate the strong potential of InGaN–ZnSnN₂/GaN and InGaN–InN/GaN QW LEDs as promising candidates for high-efficiency long-wavelength optoelectronic devices.

在inₓGa₁₁ₓN/GaN量子阱（QW）发光二极管（led）中实现高效红红外发射仍然具有挑战性，因为强极化场在空间上分离了电子和空穴波函数，从而降低了辐射复合效率。在这项工作中，提出了在井中心结合δ-ZnSnN 2和δ-InN层的InGaN/GaN QW结构来缓解这一限制。数值分析表明，与传统的InGaN/GaN量子阱相比，电子-空穴重叠（Meh）增加了近三倍，实现了高效的红色发射。δ层厚度的进一步优化使发射进入红外区。系统地研究了发射波长和Meh与电流密度的关系。所提出的结构实现自发辐射重组率比传统设计高6倍以上，辐射效率超过50% %。这些结果证明了InGaN-ZnSnN 2 /GaN和InGaN-InN /GaN QW led作为高效长波光电器件的有希望的候选材料的强大潜力。

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引用次数: 0

Ultracompact, broadband and nonvolatile on-chip programmable optical router based on Sb2Se3 metasurfaces: A hybrid inverse design approach 基于Sb2Se3元表面的超紧凑、宽带和非易失性片上可编程光路由器：一种混合逆设计方法

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-21 DOI: 10.1016/j.photonics.2026.101507

Sanaz Zarei

Interferometer meshes are underpinning many new technologies for fully programmable optical circuits; however, their large footprint limits their scalability. Our investigations demonstrated a new approach for on-chip reconfigurable optical routing based on integrated one-dimensional Sb₂Se₃ phase change metasurfaces on the silicon-on-insulator (SOI) platform. In the presented scheme, silicon functions as the light guide, and Sb₂Se₃ provides the means for reconfigurability. Reconfiguration is achieved by the dynamic control over the refractive index of Sb₂Se₃ by selectively adjusting the crystalline phase of Sb₂Se₃. With a device footprint of 10 µm × 35 μm, the proposed router is more compact than Mach-Zehnder interferometer meshes, while providing a non-volatile and broadband reconfigurable paradigm for programmable optical flow control. A hybrid inverse design approach that combines machine learning and Genetic algorithm is utilized for programmable router design. Machine learning that is based on a Fourier-optics model combined with a gradient-based optimization method enables rapid exploration of the design space and provides a fast design candidate. Genetic algorithm exploits a full-wave electromagnetic solver for a more accurate structural modeling and fine-tunes the design generated by machine learning. The presented hybrid inverse design methodology leverages the speed and global search capabilities of machine learning with the precision and fine-tuning of the Genetic algorithm.

干涉仪网格是许多全可编程光电路新技术的基础；然而，它们巨大的内存占用限制了它们的可伸缩性。我们的研究展示了一种基于集成一维Sb2Se3相变超表面的片上可重构光路由的新方法，该方法基于硅绝缘体（SOI）平台。在该方案中，硅作为光导，Sb2Se3提供了可重构性的手段。通过选择性地调整Sb2Se3的晶相，对Sb2Se3的折射率进行动态控制，实现了重构。该路由器的器件占地面积为10 µm × 35 μm，比Mach-Zehnder干涉仪网格更紧凑，同时为可编程光流控制提供非易失性和宽带可重构范例。将机器学习和遗传算法相结合的混合逆向设计方法用于可编程路由器的设计。基于傅里叶光学模型的机器学习结合了基于梯度的优化方法，可以快速探索设计空间，并提供快速的设计候选方案。遗传算法利用全波电磁求解器进行更精确的结构建模，并对机器学习生成的设计进行微调。所提出的混合反设计方法利用了机器学习的速度和全局搜索能力以及遗传算法的精度和微调。

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引用次数: 0

Highly sensitive hybrid plasmonic 2D photonic crystal magnetic field sensor 高灵敏度混合等离子体二维光子晶体磁场传感器

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-20 DOI: 10.1016/j.photonics.2026.101505

Toka Alfeky , Shimaa S. Abdelfattah , Zeinab A. Ali , Mohamed Farhat O. Hameed , S.S.A. Obayya , Mahmoud Salman S. Ibrahim

In this paper, an innovative and sensitive hybrid plasmonic/2D photonic crystal-based sensor for precise magnetic field strength monitoring from 30 mT (milliTesla) to 60 mT is studied and analyzed. The suggested sensor has 2D photonic crystal of silicon rods embedded in air background. Additionally, four plasmonic rods of silver are used around a central SiO₂ nanoring cavity. The nanocavity is filled with a proper magnetic fluid (MF). The suggested design has a resonance peak that is correlated to the externally applied magnetic field intensity. The transmission spectrum, in addition to the electric field distribution are simulated using numerically efficient finite element method (FEM) through COMSOL Multiphysics software. The band structure and the photonic bandgap for the two polarized modes, transverse electric (TE), and transverse magnetic (TM) are computed through the plane wave expansion (PWE) method. The geometrical dimensions are studied for enhancing the sensor performance parameters, addressing the spectral sensitivity (S), quality factor (Q), and figure of merit (FOM). The proposed design demonstrates a remarkable sensitivity of 800 nm/RIU (≈ 40.7 nm/mT), an ultra-high Q of 14885, and FOM of 6936 RIU⁻¹ (≈ 353.9 mT⁻¹). These presented findings indicate that the sensor has the capability for highly accurate magnetic field detection, making it suitable for utilization in biomedical detection and environmental monitoring. Furthermore, this work provides informative details into the architecture and optimization of hybrid plasmonic-photonic sensors for enhanced performance, opening new avenues for sensitive detection across various fields. It also helps in biological and medical diagnosis of brain and heart diseases, and in detecting magnetic pollutants in water or soil.

本文研究和分析了一种新型的、灵敏的混合等离子体/二维光子晶体传感器，用于监测30mt（毫特斯拉）至60mt的精确磁场强度。该传感器具有嵌入在空气背景中的硅棒二维光子晶体。此外，四个等离子体银棒被用于围绕中心SiO2纳米腔。纳米腔内填充适当的磁流体（MF）。建议的设计有一个共振峰，与外部施加的磁场强度相关。通过COMSOL Multiphysics软件，采用数值高效有限元法（FEM）对透射谱和电场分布进行了模拟。利用平面波展开（PWE）方法计算了横向电（TE）和横向磁（TM）两种极化模式的能带结构和光子带隙。研究了提高传感器性能参数的几何尺寸，解决了光谱灵敏度(S)、质量因子(Q)和品质系数（FOM）。该设计具有800 nm/RIU（≈40.7 nm/mT）的灵敏度，14885的超高Q值和6936 RIU−1（≈353.9 mT−1）的FOM。这些结果表明，该传感器具有高精度的磁场检测能力，适合用于生物医学检测和环境监测。此外，这项工作为提高性能的混合等离子体-光子传感器的结构和优化提供了翔实的细节，为各个领域的敏感探测开辟了新的途径。它还有助于大脑和心脏疾病的生物和医学诊断，以及检测水或土壤中的磁性污染物。

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引用次数: 0

Broadband polarization-insensitive Si-inserted MXene metamaterials absorber from UV to SWIR regions 宽带偏振不敏感的si - MXene超材料从紫外区到SWIR区吸收

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-15 DOI: 10.1016/j.photonics.2026.101506

Ruozhang Xing, Xiujuan Zou, Wei Zhou, Jing Chen

MXene-based broadband absorbers have sparked considerable interest in thermal management, antenna design, and stealth technology, but ones that cover the spectrum from ultraviolet (UV) to short-wave infrared (SWIR) pose challenges. In this work, the mechanism of impedance matching — achieved through optical interference and material loss — for near-perfect absorption in the SWIR region is probed based on the transfer matrix theory. Furthermore, a broadband Si-inserted MXene metamaterials absorber covering UV to SWIR regions with a classical MXene-dielectric-MXene configuration is proposed and numerically demonstrated. The absorber achieves high absorption with an average value of 94.9% and minimum value of 87% ranging from 300 nm to 3300 nm. Importantly, average absorption in the SWIR region reaches 96.13%, with absorption peaking above 99% ranging from 2300 nm to 2700 nm. The broadband absorption can be attributed to multiple different resonances and couplings. The robustness of the absorber was further demonstrated by examining the absorption under oblique incidence in polarized light. These findings exhibit spatially concentrated broadband absorption, with potential applications in energy harvesting, infrared stealth, and thermal sensing.

基于mxene的宽带吸收器已经引起了人们对热管理、天线设计和隐身技术的极大兴趣，但是覆盖从紫外线（UV）到短波红外（SWIR）光谱的吸收器带来了挑战。本文基于传递矩阵理论，探讨了在SWIR区域通过光干涉和材料损耗实现的近乎完美吸收的阻抗匹配机制。此外，提出了一种覆盖紫外到SWIR区域的宽带si -插入MXene超材料吸收体，具有经典的MXene-介电-MXene结构并进行了数值验证。在300 ~ 3300 nm范围内，吸收剂的平均吸收率为94.9%，最小吸收率为87%。重要的是，在SWIR区域的平均吸收率达到96.13%，99%以上的吸收峰在2300 ~ 2700 nm范围内。宽带吸收可归因于多种不同的共振和耦合。通过检测偏振光斜入射下的吸收，进一步证明了吸收器的鲁棒性。这些发现显示了空间集中的宽带吸收，在能量收集、红外隐身和热传感方面具有潜在的应用前景。

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引用次数: 0

Epsilon-near-zero nonlinearity driven all-optical modulation in quasi-bound state in the continuum metasurfaces 连续介质超表面准束缚态的epsilon近零非线性驱动全光调制

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-13 DOI: 10.1016/j.photonics.2026.101504

Shuang Li, Lixun Sun, Jiajie Chen, Qiwei Miao, Xin Wang, Yuyang Xiao, Ting Mei

Enhancing optical nonlinearity is crucial for the advancement of compact and efficient photonic devices, enabling new capabilities in frequency conversion, harmonic generation, and all-optical switching. This study investigates the enhancement of epsilon-near-zero nonlinearity in indium tin oxide films through the integration of a quasi-bound state in the continuum (q-BIC) metasurface, which is composed of periodic, centrosymmetric circular hole structures. Near-perfect (>95 %) light absorption under normal incidence is achieved by creating an overlap between the q-BIC and a simultaneous surface lattice resonance mode in the frequency domain through optimizing the structural parameters. Pump-probe measurements reveal significant modulation in transmission (≈20 %) under optical excitation, along with a rapid response time (2.766 ps) suitable for high-speed applications. These findings are anticipated to contribute to the development of advanced optical devices that leverage all-optical modulation for high-speed data processing and communication applications.

增强光学非线性对于推进紧凑和高效的光子器件至关重要，从而实现频率转换，谐波产生和全光开关的新功能。本研究通过在连续介质（q-BIC）超表面（由周期性、中心对称的圆孔结构组成）中集成准束缚态，研究了氧化铟锡薄膜中epsilon-近零非线性的增强。通过优化结构参数，在频域上形成q-BIC和同时存在的表面晶格共振模式之间的重叠，实现了法向入射下近乎完美的光吸收（>95 %）。泵浦探针测量显示，在光激发下，传输调制显著（≈20 %），响应时间快速（2.766 ps），适用于高速应用。预计这些发现将有助于开发利用全光调制进行高速数据处理和通信应用的先进光学器件。

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引用次数: 0

Room-temperature ammonia sensing by laser-produced nanohybrid of zinc and tin oxides 激光制备锌锡氧化物纳米杂化物的室温氨传感

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-12 DOI: 10.1016/j.photonics.2026.101502

A.A. Aljulaih , R. Zheng , S.O. Gurbatov , A.A. Kuchmizhak , A.V. Shabalina , M. Hashida , S. Iwamori , S.A. Kulinich

This work reports on hybrid nanomaterial of ZnO and SnO_x prepared via laser ablation of corresponding metals in water and its use for gas sensing. We demonstrate that a hybrid nanomaterial of these two semiconductor oxides can be conveniently prepared via ablating sequentially Zn and Sn metal plates in water by means of nanosecond pulsed YAG laser. The produced ZnO-SnO_x nanomaterial was then characterized and annealed to reduce the amount of metallic Sn inclusions and promote the formation of composite material. Compared to its individual components, ZnO and SnOₓ nanomaterials which primarily responded to ethanol, the hybrid ZnO–SnOₓ nanomaterial exhibited enhanced selectivity and sensitivity toward ammonia. Notably, the sensor could respond to concentrations as low as 10 ppm, demonstrating a response time to NH₃ of ∼70 s. These findings highlight the potential of the novel hybrid material for further optimization and improvement of its room-temperature gas-sensing performance.

本文报道了激光烧蚀水中相应金属制备ZnO和SnOx杂化纳米材料及其在气敏中的应用。我们证明了利用纳秒脉冲YAG激光在水中依次烧蚀Zn和Sn金属板，可以方便地制备这两种半导体氧化物的杂化纳米材料。然后对制备的ZnO-SnOx纳米材料进行表征和退火，以减少金属锡夹杂的数量，促进复合材料的形成。ZnO和SnOₓ纳米材料主要对乙醇有反应，相比于前者，杂化ZnO - SnOₓ纳米材料对氨具有更强的选择性和敏感性。值得注意的是，该传感器可以响应低至10 ppm的浓度，对NH3的响应时间为~ 70 s。这些发现突出了新型杂化材料在进一步优化和改进其室温气敏性能方面的潜力。

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引用次数: 0

Scattering of electromagnetic waves by spherical dielectric cavities with double-sided impedance boundary conditions 具有双面阻抗边界条件的球形介质腔对电磁波的散射

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-12 DOI: 10.1016/j.photonics.2026.101503

Emre İşcan

This study presents the scattering by arbitrarily oriented Hertzian dipoles from a spherical dielectric cavity with a circular aperture, bounded by different impedance conditions on its spherical surfaces. The formulation applies the method of auxiliary sources (MAS) together with Leontovich boundary conditions to investigate how source location, aperture geometry, dielectric constant, and impedance characteristics effect the resonance and radiation behavior of the semi-open cavity. The scattered fields inside and outside the structure are represented by orthogonal auxiliary dipoles distributed on auxiliary surfaces, formulated in accordance with Huygens’s principle, which ensures accurate boundary enforcement while removing singularities in the integral equations. Numerical results are presented for a wide range of configurations, revealing the impact of aperture variation, dielectric media, boundary impedances and source placement on both the total radar cross section and near-field distributions. The resonance characteristics are systematically analyzed, and the approach is verified against established solutions in limiting cases. In comparison with conventional full-wave computational methods, the MAS provides high accuracy with significantly reduced computational time and memory usage. The results confirm the efficiency and reliability of the proposed algorithm for analyzing spherical dielectric cavities with impedance boundary conditions.

本文研究了任意取向的赫兹偶极子在具有圆形孔径的球形介质腔中的散射，其球面上有不同的阻抗条件。该公式采用辅助源（MAS）方法，结合Leontovich边界条件，研究了源位置、孔径几何形状、介电常数和阻抗特性对半开腔谐振和辐射行为的影响。结构内外的散射场由分布在辅助表面上的正交辅助偶极子表示，根据惠更斯原理表示，保证了精确的边界执行，同时消除了积分方程中的奇异性。数值结果显示了孔径变化、介质、边界阻抗和源位置对雷达总截面和近场分布的影响。系统地分析了谐振特性，并在极限情况下用已建立的解对该方法进行了验证。与传统的全波计算方法相比，MAS提供了更高的精度，显著减少了计算时间和内存使用。结果证实了该算法在具有阻抗边界条件的球形介质腔分析中的有效性和可靠性。

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引用次数: 0

Analytical modeling of plasmonic properties of materials with surface defects 表面缺陷材料等离子体特性的解析建模

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2026-01-11 DOI: 10.1016/j.photonics.2026.101501

Anton V. Dyshlyuk , Oleg B. Vitrik

An efficient analytical method is introduced to describe electrodynamic phenomena occurring in nanoscale imperfections on material surfaces, particularly focusing on low-aspect-ratio dome-like 2D protrusions and depressions on the surface of plasmonic metals. The model provides compact formulas for calculating the distribution of polarization charges directly on the defect surface, valid for smooth (edge-free) geometries of irregularities. Meanwhile, the corresponding plasmonic near-field is represented in integral form, allowing straightforward numerical integration even for arbitrary realistic geometries.Additionally, the model separately accounts for their resonant properties, ensuring precise quantitative assessment of the localized surface plasmon resonance effect. For Gaussian-profiled 2D defects, the model additionally yields a compact expression for computing corrections to the dipole moment in the Born approximation. Comprehensive validation using full-wave finite element numerical simulations demonstrates excellent agreement with experimental data, underscoring the high level of precision and versatility offered by the new approach. Since surface-engineered materials play a pivotal role in emerging areas such as bio-sensing, renewable energy systems, and integrated nanophotonic devices, understanding how geometric features influence localized plasmonic responses is essential for advancing these technologies towards higher performance and broader applications. Unlike traditional computational models requiring significant computational effort, especially for complex defect shapes, our method enables rapid evaluation of key electrodynamic quantities while maintaining aceptable accuracy across various scenarios. The proposed framework facilitates better predictions and optimized utilization of plasmonic effects in varied contexts, such as enhancing biosensor performance, improving solar cell efficiencies, and enabling innovations in adaptive metamaterials.

介绍了一种有效的分析方法来描述材料表面纳米级缺陷中发生的电动力学现象，特别是关注等离子体金属表面的低纵横比圆顶状二维凸起和凹陷。该模型为直接计算缺陷表面极化电荷分布提供了简洁的公式，适用于不规则的光滑（无边缘）几何形状。同时，相应的等离子体近场以积分形式表示，即使对任意实际几何形状也允许直接的数值积分。此外，该模型单独考虑了它们的共振特性，确保了局部表面等离子体共振效应的精确定量评估。对于高斯型二维缺陷，该模型还产生了一个紧凑的表达式，用于计算玻恩近似中偶极矩的修正。利用全波有限元数值模拟进行的综合验证与实验数据非常吻合，强调了新方法提供的高水平精度和多功能性。由于表面工程材料在生物传感、可再生能源系统和集成纳米光子器件等新兴领域发挥着关键作用，因此了解几何特征如何影响局部等离子体响应对于推进这些技术向更高性能和更广泛应用至关重要。不像传统的计算模型需要大量的计算工作，特别是对于复杂的缺陷形状，我们的方法能够快速评估关键的电动力学量，同时在各种情况下保持可接受的精度。提出的框架有助于更好地预测和优化等离子体效应在各种情况下的利用，例如增强生物传感器性能，提高太阳能电池效率，以及实现自适应超材料的创新。

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引用次数: 0

Multifunctional dynamically tunable metasurface for wavefront manipulation based on vanadium dioxide and spin-decoupling mechanism 基于二氧化钒和自旋去耦机制的波前操纵多功能动态可调超表面

IF 2.9 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-12-27 DOI: 10.1016/j.photonics.2025.101500

Zepeng Zhao , Lijian Zhang , Xuyang Chen , Chuang Gao , Tianle Wei , Hua Guo , Tian Liu

Dynamic wavefront modulation can enhance the performance of optical devices. The paper presents a tunable terahertz metasurface device based on the thermally induced phase transition of vanadium dioxide (VO

_{2}

) and a spin-decoupling mechanism, enabling temperature-responsive wavefront manipulation of circularly polarized waves. In the low-temperature phase, left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) waves excite vortex beams with topological charges of l =

- 1

and l =

- 2

, respectively; in the high-temperature phase, vortex beams with l =

+ 1

and l =

+ 2

are generated. Building upon this, a focusing functionality is introduced to achieve the synergistic control of vortex beam generation and beam focusing. Under LCP illumination, the phase transition of VO

_{2}

enables a dynamic switch from a

1200 μ m

focus in the low-temperature state to an l =

+ 1

vortex beam in the high-temperature state; under RCP illumination, it enables a transition from an l =

- 1

vortex beam at low temperature to beam focusing at

1800 μ m

in the high-temperature state. The proposed design achieves a deep integration of thermal regulation, spin selectivity, and wavefront shaping, demonstrating great potential for applications in intelligent and reconfigurable terahertz devices.

动态波前调制可以提高光学器件的性能。本文提出了一种基于二氧化钒（VO2）热诱导相变和自旋去耦机制的可调谐太赫兹超表面器件，实现了圆极化波的温度响应波前操纵。在低温阶段，左旋圆极化（LCP）波和右旋圆极化（RCP）波分别以l =−1和l =−2的拓扑电荷激发涡旋光束；在高温阶段，产生l = +1和l = +2的涡旋光束。在此基础上，引入聚焦功能，实现涡旋光束产生和光束聚焦的协同控制。在LCP光照下，VO2的相变使低温状态下的1200μm聚焦动态切换到高温状态下的l = +1涡旋光束；在RCP光照下，低温状态下的l =−1涡旋光束转变为高温状态下1800μm的光束聚焦。该设计实现了热调节、自旋选择性和波前整形的深度集成，在智能和可重构太赫兹器件中展示了巨大的应用潜力。

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引用次数: 0