Photonics and Nanostructures-Fundamentals and Applications最新文献

英文中文

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 : 2025-07-01 Epub 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

Thermal light emitters based on graphene directly grown on chips by etching-precipitation method 采用蚀刻-沉淀法直接在芯片上生长的基于石墨烯的热发光器件

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-17 DOI: 10.1016/j.photonics.2025.101400

Yui Shimura , Shinichiro Matano , Jumpei Yamada , Suguru Noda , Hideyuki Maki

Graphene has been actively explored for on-chip nanoscale light sources, due to its small size, high brightness and fast-modulating blackbody radiation sources. However, the productivity problem is that the fabrication processes require a transfer process when mechanically exfoliated or chemical vapor deposited graphene are used, resulting in low productivity and degradation of graphene quality. Here, we fabricated a graphene-based thermal light emitter by using an etching-precipitation method that does not require the transfer process. Infrared and visible light emission was observed from the central constricted area, forming a hot spot. Raman measurements confirmed that defect healing occurred in the central hot spot of graphene due to the annealing effect caused by Joule heating. We also demonstrated that the device has long-term luminescence stability. This light emitter provides a promising avenue for the advancement of on-chip graphene light emitters.

石墨烯具有体积小、亮度高、黑体辐射源快速调制等优点，被广泛用于片上纳米级光源的研究。然而，生产效率的问题是，当使用机械剥离或化学气相沉积石墨烯时，制造过程需要一个转移过程，导致生产效率低，石墨烯质量下降。在这里，我们使用不需要转移过程的蚀刻-沉淀方法制造了基于石墨烯的热光发射器。从中心收缩区域观测到红外和可见光发射，形成一个热点。拉曼测量证实，由于焦耳加热引起的退火效应，石墨烯的中心热点发生了缺陷愈合。我们还证明了该器件具有长期的发光稳定性。这种光发射器为片上石墨烯光发射器的发展提供了一条有前途的途径。

引用次数: 0

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 : 2025-07-01 Epub 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

Effects of Tamm state on electron tunneling through Schottky barrier and on bulk electron photoemission in metal-semiconductor nanostructures 金属半导体纳米结构中Tamm态对电子隧穿肖特基势垒和体电子光发射的影响

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-30 DOI: 10.1016/j.photonics.2025.101405

Renat Sh. Ikhsanov , Igor V. Smetanin , Igor E. Protsenko , Alexander V. Uskov

A model has been developed to calculate the Tamm quasi-level in metal-semiconductor structures with Schottky barrier. The model was used to show that electron resonance tunneling from metal to semiconductor through the Schottky barrier can occur with the Tamm quasi-level at the metal-semiconductor interface. The resonance tunneling with the Tamm quasi-level can strongly affect the electron photoemission in plasmonic structures from the metal to the surrounding semiconductor, lowering the red limit of the photoeffect and significantly increasing the internal quantum efficiency of photoemission and the quantum yield of hot carrier generation in plasmonic structures, especially for photochemistry (photocatalysis).

建立了一个计算具有肖特基势垒的金属半导体结构中Tamm准能级的模型。该模型表明，电子共振隧穿可以通过肖特基势垒在金属-半导体界面的准能级上发生。Tamm准能级共振隧穿可以强烈影响等离子体结构中从金属到周围半导体的电子光发射，降低光效应的红极限，显著提高等离子体结构中光发射的内部量子效率和热载流子产生的量子产率，特别是光化学（光催化）。

引用次数: 0

Dual-functional reconfigurable metasurface for reversible circular and linear dichroism 可逆圆和线性二色的双功能可重构超表面

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-29 DOI: 10.1016/j.photonics.2025.101407

Ying Cui, Xueyan Han, Jianguo Lei, Aohan Zhang, Xiaozhe Lu

Dual-functional dichroic devices hold great potential applications in optical integrated systems, but most chiral devices are designed for a specific function of circular or linear dichroism (CD or LD). Herein, we numerically demonstrated a dichroic metasurface with giant and reversible CD and LD simultaneously by controlling the phase transition of Ge₂Sb₂Se₄Te₁(GSST) in a U-shaped array. By changing the symmetry of the structure via dynamically controlling the states of GSST inclusions, the maximum tuning ranges of CD of −0.89 to 0.89 and LD of −0.85 to 0.92 are achieved in the near-infrared (NIR) band. Theoretical analysis shows that the giant CD originates from the circular polarization selective excitations of magnetic dipole-electric quadrupole (MD-EQ) resonance, and the dual-band LD originates from the linear polarization selective excitations of MD-EQ and toroidal dipole (TD) resonances. To our knowledge, this is the first NIR metasurface capable of large-range switchable CD and LD simultaneously, which may provide new ideas for the design of polarization integrated devices.

双功能二色性器件在光学集成系统中具有巨大的应用潜力，但大多数手性器件是为圆或线性二色性（CD或LD）的特定功能而设计的。本文通过u形阵列控制Ge2Sb2Se4Te1（GSST）的相变，在数值上展示了一个同时具有巨大可逆CD和LD的二向色超表面。通过动态控制GSST包体的状态来改变结构的对称性，在近红外（NIR）波段实现了CD的最大调谐范围为- 0.89 ~ 0.89，LD的最大调谐范围为- 0.85 ~ 0.92。理论分析表明，巨CD来源于磁偶极-电四极（MD-EQ）共振的圆极化选择性激发，双频LD来源于磁偶极-电四极（MD-EQ）共振和环向偶极（TD）共振的线性极化选择性激发。据我们所知，这是第一个能够同时大范围切换CD和LD的近红外超表面，这可能为偏振集成器件的设计提供新的思路。

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引用次数: 0

Robust single photon generation in topological coupled cavity-waveguide QED system 拓扑耦合腔波导QED系统的鲁棒单光子产生

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-15 DOI: 10.1016/j.photonics.2025.101401

Kang-Hyok O, Kwang-Hyon Kim

For implementation of large-scale quantum computation, we need on-chip single photon sources compatible with integrated photonic circuits. In particular, robustness of topological photonic systems against structural defects or disorder enables us to obtain reliable operations of photonic devices. In this work, we present a robust single photon source based on the resonant excitation of an InAs/GaAs quantum dot embedded in topological coupled cavity-waveguide system. The emission dynamics of the system is investigated by numerically solving master equation for reduced density matrix of effective cavity quantum electrodynamics system. The results show that single photons can be generated with a purity of about 0.8 and a source brightness of around 11 % under resonant excitation. Compared with non-topological system, the proposed topological source exhibits the single photon emission immune to structural defects. Such a robustness of emission performance is the key advantage of the proposed system over non-topological ones, offering practical applicability for quantum technology.

为了实现大规模量子计算，我们需要与集成光子电路兼容的片上单光子源。特别是，拓扑光子系统对结构缺陷或无序的鲁棒性使我们能够获得光子器件的可靠操作。在这项工作中，我们提出了一种基于嵌入在拓扑耦合腔波导系统中的InAs/GaAs量子点的谐振激发的鲁棒单光子源。通过数值求解有效腔量子电动力学系统的降密度矩阵主方程，研究了系统的发射动力学。结果表明，在共振激发下，可以产生纯度约为0.8的单光子，光源亮度约为11. %。与非拓扑源相比，该拓扑源具有不受结构缺陷影响的单光子发射特性。这种发射性能的鲁棒性是该系统相对于非拓扑系统的关键优势，为量子技术提供了实际的适用性。

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引用次数: 0

Deep learning-assisted focus engineering for metalens design with high numerical aperture cylindrical vector beams 高数值孔径圆柱矢量光束超构透镜设计的深度学习辅助聚焦工程

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-15 DOI: 10.1016/j.photonics.2025.101396

Shengmei Ou , Jiakang Xu , Jiming Wang , Yulian Zhu , Xiaorong Gu , Tong Wu , Youwen Liu

Deep learning, in comparison to traditional optimization algorithms, offers significant advantages in addressing complex problems involving multi-dimensional design parameters for the customization of three-dimensional focal fields. In this paper, we present a design method that combines Richards-Wolf vector diffraction theory and neural network techniques for achieving the customization of different focal fields. We utilize a Physics-Connected Neural Network (PCNN) to devise a discrete filter with 25 rings for guiding the structure of the all-dielectric metalens, thereby facilitating the inverse design of optical needles, optical tubes, and flat-top light fields with an extended focal depth (>10λ). The results demonstrate that when combined with a physical model, the neural network effectively adapts to diverse design objectives, reduces design complexity, and improves the efficiency of the design process.

与传统的优化算法相比，深度学习在解决涉及三维焦场定制的多维设计参数的复杂问题方面具有显著优势。本文提出了一种结合Richards-Wolf矢量衍射理论和神经网络技术实现不同焦场定制的设计方法。我们利用物理连接神经网络（PCNN）设计了一个25环的离散滤波器，用于指导全介电超构透镜的结构，从而促进了光针、光管和扩展焦深（>10λ）的平顶光场的反设计。结果表明，当与物理模型相结合时，神经网络可以有效地适应不同的设计目标，降低设计复杂性，提高设计过程的效率。

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 : 2025-07-01 Epub 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 : 2025-07-01 Epub 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

Design and applications of a metasurface supporting chiral quasi-bound state in the continuum: Refractive index sensing and nonlinear harmonic generation 连续介质中支持手性准束缚态的超表面设计与应用：折射率传感与非线性谐波产生

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

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2025-07-01 Epub Date: 2025-05-23 DOI: 10.1016/j.photonics.2025.101402

Zefa Sun, Yang Li, ShenWei Yin, Yu Mao, Yi Zhou, Zhixiang Tang

Metasurfaces empowered by quasi-BICs (q-BICs) have been widely employed to enhance chiral optical responses and enable sensing; however, studies that integrate both functionalities within a single design remain limited. In this work, we design a planar q-BIC chiral metasurface consisting of tilted TiO₂ bars with off-center inner holes, placed on a SiO₂ substrate and coated with polymethyl methacrylate (PMMA). Numerical simulations demonstrate that this design presents near-perfect circular dichroism (CD>0.99). Beyond exhibiting strong chirality, refractive index sensing with a sensitivity of 75.8 nm/RIU and a remarkable nonlinear CD approaching 1 are achieved with the same metasurface. These findings may provide a versatile platform for applications such as chiral laser generation, precision chiral sensing, and nonlinear optical filtering.

准bic （q- bic）增强的元表面被广泛应用于增强手性光学响应和实现传感；然而，在单一设计中集成这两种功能的研究仍然有限。在这项工作中，我们设计了一个平面q-BIC手性超表面，由带有偏心内孔的倾斜TiO2条组成，放置在SiO2衬底上，并涂有聚甲基丙烯酸甲酯（PMMA）。数值模拟表明，该设计具有近乎完美的圆二色性（CD>0.99）。除了表现出强手性外，在相同的超表面上实现了75.8 nm/RIU的折射率传感灵敏度和接近1的显著非线性CD。这些发现可能为手性激光产生、精密手性传感和非线性光学滤波等应用提供一个通用的平台。

引用次数: 0

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