Photonics and Nanostructures-Fundamentals and Applications最新文献_第8页

Dyakonov surface waveguide modes in asymmetric interfacial strip waveguide 非对称界面条波导中的Dyakonov表面波导模式

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-05-14 DOI: 10.1016/j.photonics.2025.101397

D.A. Chermoshentsev , O.V. Borovkova , I.I. Stepanov , I.A. Bilenko , N.A. Gippius , S.A. Dyakov

We report a theoretical prediction of Dyakonov surface waveguide modes that propagate along a flat strip interfacial waveguide formed by two anisotropic materials, bounded by metal on one side and air on the other. We demonstrate that due to asymmetric metal/air boundary conditions, surface waves can exist in such a system regardless of the type of optical anisotropy. The asymmetric waveguide with negative anisotropy supports a strongly localized solution, whereas in the case of positive anisotropy, the mode intensity decays slowly with distance from the interface. We also analyze the dispersion and field structure of these waves using perturbation theory in the approximation of weak anisotropy. We demonstrate that, irrespective of the type of optical anisotropy, Dyakonov surface waveguide modes exhibit a high degree of circular polarization, reaching values of ±1 at certain distances from the boundaries. Our results are consistent with numerical simulations using the finite element method. We believe this work opens new opportunities for the experimental investigation of Dyakonov surface waves and their practical applications.

我们报告了Dyakonov表面波导模式的理论预测，该模式沿着由两种各向异性材料形成的平坦带状界面波导传播，一侧由金属和另一侧由空气包围。我们证明了由于不对称的金属/空气边界条件，无论光学各向异性的类型如何，表面波都可以存在于这样的系统中。具有负各向异性的非对称波导支持强局域解，而在正各向异性的情况下，模强度随距离界面的距离缓慢衰减。在弱各向异性近似中，我们还用微扰理论分析了这些波的色散和场结构。我们证明，无论光学各向异性的类型如何，Dyakonov表面波导模式都表现出高度的圆偏振，在距离边界一定距离处达到±1的值。所得结果与有限元数值模拟结果一致。我们相信这项工作为Dyakonov表面波的实验研究及其实际应用开辟了新的机会。

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引用次数: 0

High-sensitivity refractive index based terahertz metasurface biosensor for detecting multiple cancers and infectious diseases 用于检测多种癌症和传染病的高灵敏度折射率太赫兹超表面生物传感器

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-05-13 DOI: 10.1016/j.photonics.2025.101399

Taha Sheheryar , Ye Tian , Bo Lv , Lei Gao

Despite notable progress, many existing terahertz biosensors rely on expensive materials like noble metals or 2D nanomaterials and are typically restricted to detecting specific biomarkers or single diseases, which limits their specificity, adaptability and real-world clinical utility. This work addresses these limitations by proposing a cost-effective, scalable refractive index based metasurface biosensor design that is composed of Aluminum and Polyimide. Through a dual-resonance mechanism, the sensor captures minute dielectric variations linked to multiple diseases including cancers such as breast, blood and cervical, as well as blood related infections like malaria. Under optimized simulation conditions, the sensor shows a high-Quality Factor exceeding 200, a Figure of Merit of 63.68 RIU⁻¹ and a sensitivity of 3.107 THz/RIU. Beyond its strong performance metrics, the sensor provides a cost-effective and non-invasive detection platform that seamlessly integrates simplicity, adaptability to multiple diseases and high diagnostic precision, advancing the field of early, rapid and accessible diagnostics across a wide range of biomedical applications, especially in resource limited settings.

尽管取得了显著的进展，但许多现有的太赫兹生物传感器依赖于昂贵的材料，如贵金属或二维纳米材料，并且通常仅限于检测特定的生物标志物或单一疾病，这限制了它们的特异性、适应性和现实世界的临床实用性。这项工作通过提出一种成本效益高、可扩展的基于铝和聚酰亚胺折射率的超表面生物传感器设计来解决这些限制。通过双共振机制，传感器捕捉到与多种疾病相关的微小介电变化，包括乳腺癌、血癌和宫颈癌等癌症，以及疟疾等与血液相关的感染。在优化的仿真条件下，该传感器的质量因数超过200，优点系数为63.68 RIU⁻¹ ，灵敏度为3.107 THz/RIU。除了其强大的性能指标外，该传感器还提供了一个具有成本效益和非侵入性的检测平台，无缝集成了简单性，对多种疾病的适应性和高诊断精度，在广泛的生物医学应用中推进了早期，快速和可获得的诊断领域，特别是在资源有限的环境中。

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引用次数: 0

Mid-infrared band multi-Fano resonance-based sensing of high-Q concave-convex arrays of metasurface with full control of Fano spectral profile 基于中红外波段多范诺共振的超表面高q凹凸阵列全控制范诺谱线传感

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-05-11 DOI: 10.1016/j.photonics.2025.101398

Mengyang Xu , Dong Lin , Haoyuan Cai , Haoran Wang , Zhichun Fan , Jing Liu , Yushan Chen

In this study, a concave-convex array metasurface with a height difference characterized structure is proposed, combining in-plane and out-of-plane asymmetry to achieve a high Q-factor, refractive index sensing, and full control of the Fano spectral profile. Notably, both the concave model and the convex model, can only produce one Fano peak. But it can yield multiple Fano resonance peaks in the mid-infrared band following a simple combination. Herein, we have performed both near-field and far-field analysis for each Fano resonance generation. The designed metasurface achieves a remarkably high Q-factor of 9.63637 × 10⁵. Moreover, it exhibits excellent reflection resonances under different polarization directions. In terms of refractive index sensing, the designed metasurface attains a sensitivity of 600 nm/RIU under TE polarization, while under TM polarization, it achieves full control of the Fano spectral profile by changing the incidence angle. The integration of periodic arrays with height differences in metasurfaces shows tremendous potential in controlling the Fano spectral profile and enhancing sensing capabilities. Additionally, this study will provide new inspirations for the sensing metasurface design with high optical performance.

本研究提出了一种具有高差特征结构的凹凸阵列超表面，结合面内和面外不对称，实现了高q因子、折射率传感和Fano光谱轮廓的完全控制。值得注意的是，无论是凹模型还是凸模型，都只能产生一个Fano峰。但在简单的组合后，它可以在中红外波段产生多个范诺共振峰。在这里，我们对每个范诺共振产生进行了近场和远场分析。所设计的超表面达到了9.63637 × 105的高q因子。在不同偏振方向下，均表现出优异的反射共振特性。在折射率传感方面，设计的超表面在TE偏振下的灵敏度达到600 nm/RIU，而在TM偏振下，通过改变入射角实现对Fano光谱轮廓的完全控制。在超表面上集成具有高差的周期阵列在控制Fano光谱轮廓和增强传感能力方面具有巨大的潜力。此外，该研究将为高光学性能的传感超表面设计提供新的灵感。

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引用次数: 0

Polarization sensitivity engineering in WS2 metasurfaces governed by quasi-bound states in the continuum 连续介质中准束缚态控制的WS2超表面偏振灵敏度工程

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-04-22 DOI: 10.1016/j.photonics.2025.101387

Amir Alfonso Rodriguez Santana, Mohammad Danaeifar

Bound states in the continuum (BICs) hold significant potential for enhancing light-matter interactions with high quality (Q) factor resonances. Concurrently, tungsten disulfide (WS₂), a transition metal dichalcogenide (TMDC), provides a pathway to attain the strong-coupling regime, garnering significant interest from researchers. In this study, we engineer polarization sensitivity in metasurfaces constructed from bulk WS₂ slabs, employing two distinct approaches. Firstly, we synthesize a polarization-sensitive metasurface composed of dual slabs with varying dimensions to achieve symmetry-protected BICs. The rotation of the electric field direction of the incident wave leads to a dramatic change in the transmittance response. Conversely, by considering a quad-slab unit cell, we develop a polarization-independent metasurface that exhibits a unique response to any orientation of the electric field of the incident wave. For both types of metasurfaces, we demonstrate the generation and tuning of quasi-BIC resonances by adjusting the degree of asymmetry. Furthermore, we elucidate how to achieve the strong coupling regime characterized by an anticrossing pattern through scaling the in-plane dimensions of the unit cell. In the strong coupling regime, Rabi splitting exhibits two distinct values of 104.2 meV and 116.8 meV for polarization-sensitive and polarization-independent metasurfaces, respectively. The polarization sensitivity engineering presented herein can be applied across various photonic systems, enabling the development of devices that are either highly sensitive or polarization-independent.

连续介质中的束缚态（bic）具有显著的潜力，可以增强具有高质量(Q)因子共振的光-物质相互作用。同时，二硫化钨（WS2），一种过渡金属二硫化物（TMDC），提供了一种实现强耦合的途径，引起了研究人员的极大兴趣。在这项研究中，我们采用两种不同的方法，设计了由大块WS2板构成的超表面的偏振灵敏度。首先，我们合成了一个由不同尺寸的双平板组成的偏振敏感超表面，以实现对称保护bic。入射波电场方向的旋转导致透射率响应的剧烈变化。相反，通过考虑四板单元电池，我们开发了一种与极化无关的超表面，该超表面对入射波的电场的任何方向都有独特的响应。对于这两种类型的超表面，我们展示了通过调整不对称程度来产生和调谐准bic共振。此外，我们阐明了如何通过缩放单元胞的平面内尺寸来实现以反交叉图案为特征的强耦合状态。在强耦合条件下，极化敏感和非极化超表面的Rabi分裂值分别为104.2 meV和116.8 meV。本文提出的偏振灵敏度工程可以应用于各种光子系统，从而开发出高灵敏度或偏振无关的器件。

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引用次数: 0

Analysis of refractive index sensor using topological photonic protected edge state in one-dimensional photonic crystal 一维光子晶体中基于拓扑光子保护边缘态的折射率传感器分析

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-04-19 DOI: 10.1016/j.photonics.2025.101388

Anjineya K , Don Mathew , Meghna C.H , Vincent Mathew

This work proposes a refractive index sensor designed with a 1D (One-dimensional) topological photonic crystal by merging two 1D photonic crystals, which differ topologically, and introducing a defect layer at the interface of these two photonic crystals. It is designed by finding and analyzing the Zak phase of the photonic crystals, and the results ensure increased sensitivity and quality factor, with the highest figure of merit of 29383.759(RIU⁻¹). The topologically protected edge state is used for sensing, which guarantees well-defined peaks with sufficient shifts in wavelength even for a minuscule change in analyte refractive index. The change in sensitivity, quality factor, and figure of merit is studied, and the response to the change in the refractive index is impressive.

本文提出了一种用一维拓扑光子晶体设计折射率传感器的方法，该方法将两个拓扑结构不同的一维光子晶体合并，并在这两个光子晶体的界面处引入缺陷层。它是通过寻找和分析光子晶体的Zak相位来设计的，结果保证了更高的灵敏度和质量因子，最高的优值为29383.759（RIU−1）。拓扑保护的边缘状态用于传感，这保证了良好定义的峰值，在波长上有足够的位移，即使在分析物折射率的微小变化。研究了灵敏度、品质因数和优值的变化，对折射率变化的响应令人印象深刻。

引用次数: 0

Machine-learning-assisted design of energy-saving windows with high near-infrared shielding properties 高近红外屏蔽性能节能窗的机器学习辅助设计

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-04-18 DOI: 10.1016/j.photonics.2025.101389

Chengchao Wang , Haojun Zhu , Hengyi Fan , Yinmo Xie , Qingzhi Lai , Lanxin Ma

Nanocomposite films based on Cesium tungsten oxide (CWO) and Indium tin oxide (ITO) nanoparticles provide a broad space for adjusting the optical properties of energy-saving windows due to their unique near-infrared absorption properties. This property has led to great research interest in the field of energy-saving windows for such materials. The optical properties of energy-saving windows are mainly determined by localized surface plasmon resonance (LSPR) of the nanoparticles, and thus they are sensitive to the variation of the geometrical parameters of the nanoparticles. Typically, the computational cost of the design of specific optical properties and iterative optimization of the geometrical parameters is expensive and time-consuming. In this study, we combine machine learning and radiative transfer calculations to achieve targeted design energy-saving windows. By adjusting the shape, material, and geometric parameters of nanoparticles, an analysis model can be established from the geometric parameters of nanoparticles to the properties of energy-saving windows. Then, a machine learning model of bidirectional deep neural network is developed to achieve accurate prediction of optical evaluation parameters (visible transmittance (T_lum), near-infrared (NIR) transmittance (T_NIR), solar radiation transmittance (T_sol), and the Figure of Merit (FOM)) for energy-saving windows, as well as inverse design of geometric parameters of nanoparticles (CWO and ITO). The results indicate that our machine learning model achieved forward prediction of energy-saving window optical properties with an accuracy of over 99 % and inverse geometric parameter design with an accuracy of over 93 %. Overall, this work provides a broadly appropriate and computationally efficient method for evaluating and designing the properties of energy-saving windows.

基于氧化铯钨（CWO）和氧化铟锡（ITO）纳米颗粒的纳米复合膜由于其独特的近红外吸收特性，为节能窗光学性能的调整提供了广阔的空间。这一特性引起了人们对这种材料的节能窗户领域的极大研究兴趣。节能窗的光学特性主要由纳米粒子的局域表面等离子体共振（LSPR）决定，因此对纳米粒子几何参数的变化非常敏感。通常，特定光学特性的设计和几何参数的迭代优化的计算成本是昂贵和耗时的。在本研究中，我们将机器学习和辐射传递计算相结合，以实现有针对性的节能窗户设计。通过调整纳米颗粒的形状、材料和几何参数，可以建立纳米颗粒几何参数对节能窗性能的分析模型。然后，建立了双向深度神经网络机器学习模型，实现了节能窗光学评价参数（可见光透过率（Tlum）、近红外透过率（TNIR）、太阳辐射透过率（Tsol）和优值图（FOM））的准确预测，以及纳米颗粒（CWO和ITO）几何参数的逆设计。结果表明，我们的机器学习模型实现了节能窗光学特性的正向预测，精度超过99 %，几何参数的逆设计精度超过93 %。总的来说，这项工作为评估和设计节能窗户的性能提供了一种广泛适用且计算效率高的方法。

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引用次数: 0

Indole-7-carboxaldehyde functionalized silver and gold nanoparticles as novel metal-organic laser power limiting composites 吲哚-7-甲醛功能化纳米银和纳米金作为新型金属有机激光限功率复合材料

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-04-05 DOI: 10.1016/j.photonics.2025.101386

Shradha Lakhera , Meenakshi Rana , A. Dhanusha , T.C. Sabari Girisun , Shruti Sharma , Papia Chowdhury

Efforts were done to enhance the nonlinear optical and optical power limiting responses of Indole-7-carboxaldehyde (I7C) after the addition of silver and gold nanoparticles. The investigations were done theoretically as well as experimentally. The reactivity parameters and potential surfaces established strong intermolecular charge interactions between metal trimer and I7C. The diffraction pattern for both I7C+AgNPs and I7C+AuNPs indicated the perfect crystallinity of the samples. The band gap of I7C+AgNPs (2.08 eV) was less than that of I7C+AuNPs (2.34 eV). The polarizability of I7C was enhanced after the addition of gold and silver nanoparticles. The value of first-order hyperpolarizability of probe I7C was observed as 4.24 × 10⁻³⁰ esu which was increased to ten times for I7C+AgNPs and eighteen times for I7C+AuNPs. The increased value of first-order hyperpolarizability supported enhanced nonlinear optical characteristics of I7C+AgNPs and I7C+AuNPs. Further, the reduction in experimentally obtained optical limiting threshold and increment in the nonlinear absorption coefficient reflects early attenuation of the nonlinear optical and enhanced optical limiting activity of I7C+AgNPs and I7C+AuNPs.

研究了加入纳米银和纳米金后，吲哚-7-甲醛（I7C）的非线性光学响应和光功率限制响应。这些研究既有理论上的，也有实验上的。反应性参数和电位表面表明金属三聚体与I7C之间存在很强的分子间电荷相互作用。I7C+AgNPs和I7C+AuNPs的衍射图表明样品具有良好的结晶度。I7C+AgNPs的带隙（2.08 eV）小于I7C+AuNPs（2.34 eV）。金纳米粒子和银纳米粒子的加入增强了I7C的极化率。探针I7C的一阶超极化率为4.24 × 10−30 esu， I7C+AgNPs为10倍，I7C+AuNPs为18倍。一阶超极化率的增加支持I7C+AgNPs和I7C+AuNPs非线性光学特性的增强。此外，实验得到的光学限制阈值的降低和非线性吸收系数的增加反映了I7C+AgNPs和I7C+AuNPs的非线性光学早期衰减和光学限制活性的增强。

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引用次数: 0

Direct laser writing of binary data on metal-organic framework surface 金属有机骨架表面二进制数据的激光直接写入

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-04-02 DOI: 10.1016/j.photonics.2025.101385

Varvara Kharitonova , Anastasia Lubimova , Valentin A. Milichko , Semyon V. Bachinin

The development of electro-optical computing systems today is proceeding at an unprecedented pace and requires the emergence of new approaches and materials for data recording and storage. Here we report on a direct laser writing (DLW) of binary data on a surface of metal-organic framework (MOF) thin film over 0.5 s with 1.5 μm resolution. The data, expressed as locally modified areas of different depth and potential, are analyzed with atomic force microscopy in Kelvin-probe regime. We reveal that an increase in laser power yields an increase in the potential of the modified area up to 100 mV (compared with 10 mV for the initial MOF surface) and decrease of the area diameter up to 1.5 μm. The mechanism of DLW is also investigated with confocal Raman spectroscopy, confirming the local modification of the structure of MOF thin film. The results, thereby, open the way for fast optical writing of electronic data with compatible density on MOFs at ambient conditions.

当今光电计算系统的发展正以前所未有的速度进行，需要出现新的方法和材料来记录和存储数据。本文报道了一种在分辨率为1.5 μm、波长为0.5 s的金属有机骨架（MOF）薄膜表面直接激光写入二进制数据的方法。数据表示为不同深度和势的局部修正区域，并在开尔文探针体制下用原子力显微镜进行了分析。结果表明，随着激光功率的增加，修饰后的MOF表面电位增加到100 mV（初始MOF表面电位为10 mV），面积直径减小到1.5 μm。用共聚焦拉曼光谱研究了DLW的作用机理，证实了MOF薄膜结构的局部修饰。因此，该结果为在环境条件下mof上具有兼容密度的电子数据的快速光学写入开辟了道路。

引用次数: 0

SERS in opal-type stripe patterned structures with metal coating 带有金属涂层的蛋白石型条纹图案结构中的SERS

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-03-31 DOI: 10.1016/j.photonics.2025.101384

Mikhail Astafurov , Elena Perevedentseva , Nikolay Melnik , Mikhail Shevchenko , Sergey Dorofeev , Alexander Ezhov , Daniil Kozlov , Anastasia Grigorieva , Sergey Klimonsky

Bilayer opal-type stripes periodically arranged on the same substrate were self-assembled using the vertical deposition of SiO₂ spheres with the intermittent motion of the meniscus. It has been shown that each such stripe with a gold or silver coating can be considered as an independent element for surface enhanced Raman scattering (SERS). The thicknesses of the gold and silver coatings were optimized using computer simulations of electromagnetic field enhancement. Monolayer or bilayer stripes of such type are not inferior to thick opal films with noble metal coating. The stripe patterned structures are easy to manufacture, exhibit good homogeneity and may be promising for automating multiple SERS tests. The structures with gold coating also demonstrate high resistance to environmental influences. The prospects for further improvement of their properties were analyzed.

在同一衬底上周期性排列的双层蛋白石型条纹，利用SiO2球的垂直沉积和半月板的间歇运动自组装而成。研究表明，每一个带有金或银涂层的条带都可以被认为是表面增强拉曼散射（SERS）的独立元素。利用计算机模拟电磁场增强，优化了金、银镀层的厚度。这种类型的单层或双层条纹并不亚于带有贵金属涂层的厚蛋白石薄膜。条纹图案结构易于制造，具有良好的均匀性，有望用于自动化多个SERS测试。涂有金的结构对环境的影响也有很高的抵抗力。分析了进一步改进其性能的前景。

引用次数: 0

Photo-thermo-acoustic (PTA) effect of a multilayer composite material with periodic micro-nano structures (PMNS): Modeling, simulation and experiment 具有周期性微纳结构（PMNS）的多层复合材料的光-热-声（PTA）效应：建模、仿真和实验

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-03-18 DOI: 10.1016/j.photonics.2025.101383

Renjie Li , Yanze Gao , Weijie Liu , Tongtong An , Hongcheng Pan , Yuan Mu , Xujin Yuan

The photo-thermo-acoustic (PTA) effect of a three-layer composite material whose surface is fabricated with many periodic micro-nano structures (PMNS) is investigated in this paper. The material is composed of a silicon substrate, a thermal insulation layer of polyimide, and a light-absorbing layer of aluminum nanoaggregates. We propose a method for analyzing the PTA effect based on the idea of finite element meshing. The PTA conversion processes including the photo-thermal conversion and the thermal-acoustic conversion are quantitatively simulated. The influence of the geometric parameters of the PMNS on the intensity and space distribution of the sound field is analyzed both by simulation and experiment. The results show that fabricating PMNS on composite materials can significantly enhance the PTA effect. And the finite element analyzing method proposed in this paper can correctly describe and predict the PTA effect of composite materials with two-dimensional PMNS. It is also applicable for analyzing the PTA effects of other similar materials or structures.

研究了一种表面由多个周期微纳结构（PMNS）构成的三层复合材料的光-热-声（PTA）效应。该材料由硅衬底、聚酰亚胺保温层和铝纳米聚集体吸光层组成。提出了一种基于有限元网格思想的PTA效应分析方法。定量模拟了PTA转换过程，包括光热转换和热声转换。通过仿真和实验分析了PMNS几何参数对声场强度和空间分布的影响。结果表明，在复合材料上制备PMNS可以显著提高PTA效果。本文提出的有限元分析方法能够正确地描述和预测二维PMNS复合材料的PTA效应。也可用于分析其它类似材料或结构的PTA效应。

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引用次数: 0