Plasmonics最新文献

{"title":"Plasmonic Enhancement of Sb₂S₃ Thin-film Solar Cells Employing Embedded Au Nanoparticles: Coupled FDTD, SCAPS-1D, with Explainable Extreme Learning Machine Deep Analysis","authors":"Faycal Djeffal,&nbsp;Tarek Berghout,&nbsp;Massinisa Siouane,&nbsp;Kalinka Kacha","doi":"10.1007/s11468-026-03458-1","DOIUrl":"10.1007/s11468-026-03458-1","url":null,"abstract":"<div><p>In this work, a novel plasmonic thin-film solar-cell structure based on Glass/AZO/ETLs/Sb₂S₃/HTLs/Au is investigated using coupled finite-difference time-domain (FDTD) optical simulations, SCAPS-1D electrical modeling, and machine-learning analysis. The influence of different electron transport layers (TiO₂, ZnO, and ZnS), hole transport layers (CuSCN, CFTS, and CBTS), Sb₂S₃ absorber thicknesses, and embedded Au nanoparticle diameters on photovoltaic performance is systematically analyzed. The obtained results demonstrate that Au nanoparticles enhance optical absorption and electromagnetic-field localization through localized surface plasmon resonance, thereby improving photocarrier generation. Among the investigated transport layers, ZnS exhibits favorable electron extraction and reduced interfacial recombination, while CBTS provides efficient hole transport and carrier collection. For the 1000 nm Sb₂S₃ absorber, the non-plasmonic ZnO/CBTS reference device exhibits a PCE of 16.20%. Introducing 20 nm AuNPs while retaining ZnO/CBTS increases the PCE to 22.95%, whereas replacing ZnO with ZnS in the absence of AuNPs increases it to 17.13%. The fully optimized Glass/AZO/ZnS/Sb₂S₃(1000 nm)(20 nm)/CBTS/Au structure achieves a PCE of 23.21%, with a short-circuit current density of 24.6 mA/cm², an open-circuit voltage of 1.13 V, and a fill factor of 83.71%. These controlled comparisons demonstrate that plasmonic enhancement provides the larger PCE improvement within the investigated configurations, while transport-layer optimization provides an additional configuration-dependent benefit. The results highlight the coupled roles of optical enhancement, carrier transport, and interface engineering in achieving high-performance Sb₂S₃ solar cells and demonstrate the effectiveness of the proposed FDTD–SCAPS–ELM framework for their systematic optimization.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 12","pages":"4245 - 4262"},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149331246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antibiofilm Activity of Pulsed Laser-Ablated Gold Nanoparticles against Biofilm-Forming Bacterial Pathogens","authors":"Arkan Kareem Buraihi,&nbsp;Zainab J. Shanan,&nbsp;Nisreen Kh. Abdalameer","doi":"10.1007/s11468-026-03495-w","DOIUrl":"10.1007/s11468-026-03495-w","url":null,"abstract":"<div><p>Against clinically and environmentally relevant biofilm-forming bacteria are a major public health concern because of their ability to adhere to surfaces and develop protective biofilms that enhance persistence, antimicrobial tolerance, and environmental survival. In this study, gold nanoparticles (AuNPs) were synthesized using pulsed laser ablation in liquid (PLAL) as a clean physical approach without chemical reducing or stabilizing agents. A high-purity gold target was ablated in ultrapure deionized water using a Q-switched Nd: YAG laser at 1064 nm, producing a stable colloidal AuNP suspension. The synthesized nanoparticles were characterized using X-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM), particle size distribution analysis, and zeta potential measurements. XRD analysis confirmed the formation of crystalline face-centered cubic gold with characteristic reflections corresponding to the (111), (200), and (220) planes, and an average crystallite size of approximately 10.5 nm. PL analysis showed a strong emission peak around 510–520 nm, indicating distinct optical activity. SEM observations revealed mostly nanoscale quasi-spherical to irregular particles, with a dominant particle size around 50 nm. Zeta potential analysis showed a highly negative surface charge of − 39.17 mV, indicating good colloidal stability. The antibiofilm activity of AuNPs was evaluated against Acinetobacter baumannii, Staphylococcus aureus, and Pseudomonas aeruginosa using the crystal violet microtiter plate assay. AuNPs reduced biofilm formation in a concentration-dependent manner. At 100% concentration, biofilm inhibition reached 70.59%, 86.67%, and 89.13% against A. baumannii, S. aureus, and P. aeruginosa, respectively. These findings demonstrate that PLAL-synthesized AuNPs possess stable physicochemical properties and promising antibiofilm activity against waterborne pathogenic bacteria.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 12","pages":"4219 - 4229"},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149331186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Core Photonic Crystal Fiber Integrated SPR Sensor and Polarization Filter Based on Coupled Mode Theory","authors":"Jawad Khan,&nbsp;Hailiang Chen,&nbsp;Sajid Ullah,&nbsp;Tong Zhang,&nbsp;Aiyandrilla Dutta,&nbsp;Sa Zhang,&nbsp;Junling Hu,&nbsp;Chunhao Yin","doi":"10.1007/s11468-026-03426-9","DOIUrl":"10.1007/s11468-026-03426-9","url":null,"abstract":"<div><p>Based on coupled mode theory, we propose a novel dual-polished photonic crystal fiber (PCF) designed to simultaneously achieve the dual-functionality of surface plasmon resonance (SPR) sensing and polarization filtering within a single platform. Unlike conventional works that rely strictly on fundamental modes, the primary novelty of this design lies in the strategic exploitation of supermodes to drive the device’s mechanisms. Owing to their characteristically larger mode areas, these supermodes exhibit exceptionally strong evanescent coupling with both the upper and lower gold (Au) thin films deposited onto the polished planes of the cladding regions. Using the finite element method (FEM), the dual-functional performance of the PCF structure was systematically analyzed. It demonstrated excellent performance in measuring the refractive index of various analytes with refractive indexes of 1.30 to 1.40, with a wavelength sensitivity (WS) of 8800 nm/RIU, a spectral resolution of 1.13636 × 10^− 5 RIU and an amplitude sensitivity (AS) of 286 RIU⁻¹. When the refractive index of the analyte is 1.37, the maximum confinement loss for the Y-polarized odd mode is 143,160 dB/m. The polarization filter effect showed an extinction ratio of -65.85 dB at a propagation distance of 2 mm, which is considered good. Its simplicity and cost-effectiveness make this design superior to existing standards. The structure can detect various analytes, thus having high flexibility in practical applications such as biosensors and integrated photonic systems.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 12","pages":"4231 - 4244"},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149331213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From Au–TiO(_2) Nanoparticle Dimers to Disordered Clusters: Enhancing Optical Absorption in Hybrid Assemblies","authors":"Cédric Rousseau,&nbsp;Victor Joris,&nbsp;Gilles Rosolen,&nbsp;Bjorn Maes","doi":"10.1007/s11468-026-03487-w","DOIUrl":"10.1007/s11468-026-03487-w","url":null,"abstract":"<div><p>Hybrid metal–dielectric nanoparticle (NP) assemblies offer a versatile strategy to tailor optical absorption without adding more metallic material. Here, we investigate whether nearly lossless TiO<span>(_2)</span> NPs can increase the absorption of Au NP assemblies by modifying the electromagnetic environment of the Au component. Full-wave simulations are used to connect the elementary Au–TiO<span>(_2)</span> dimer response to disordered three-dimensional clusters, and orientationally controlled planar heterodimer arrays. At the dimer level, the TiO<span>(_2)</span> NP acts as a dielectric mediator that stores and redirects electromagnetic energy. Depending on geometry and illumination, this adjusted field enhances or suppresses the excitation of the Au NP, leading at <span>(lambda = 520)</span> nm to a 43% absorption increase in the most favorable configuration, and to a 26% decrease in an unfavorable one, relative to an isolated Au NP. In random clusters, TiO<span>(_2)</span> addition produces a mean absorption enhancement of about 11% near the isolated Au NP absorption maximum, relative to the matched Au-only reference, and about 44% relative to a more compact Au-only cluster containing the same number of Au NPs. This gain results from the combination of local field redistribution and reduced optical shielding. In planar heterodimer arrays, orientational control of the NPs partially preserves the dimer-level trends, yielding geometry-dependent significant absorption modulations. These results demonstrate that nearly lossless dielectric NPs can enhance absorption in Au assemblies at fixed Au content, providing a tunable route for photothermal conversion, light harvesting, and absorption control in hybrid nanophotonic architectures.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4207 - 4218"},"PeriodicalIF":5.6,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149309692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Validation of Low-Profile Quad-Band Metamaterial Absorber for Shielding Technology for Higher Frequency Bands","authors":"Anushree Prakash,&nbsp;Neelam Singh,&nbsp;Kunal Singh","doi":"10.1007/s11468-026-03491-0","DOIUrl":"10.1007/s11468-026-03491-0","url":null,"abstract":"<div><p>This work presents a simple and compact Concentric Octagonal Split-Ring Resonator (COSRR) based metamaterial absorber (MMA) for microwave absorber applications in the X, Ku, and K-band. The proposed MMA has an electrical size of approximately 0.394<span>(lambda _{0})</span> <span>(times )</span> 0.394<span>(lambda _{0})</span>. The MMA unit cell demonstrates transmission resonance with Mu Negative (MNG) metamaterial properties. It has an excellent absorption value of 98.88%, 90%, 99.30%, and 95.11% at absorption frequencies of 9.85, 12.8, 15.48, and 20.42 GHz, respectively, for TE, TM, and TEM modes. Over a broad polarization and angular range (0<span>(^circ )</span> to 90<span>(^circ )</span>), the absorber continues to operate steadily in the operating frequency range. The Shielding effectiveness of MMA at absorption frequencies is 38.46 dB, 19.58 dB, 51.75 dB, and 27.40 dB, making this design useful for many wireless applications. The Q-factors are 36.36, 31.52, 27.31, 67.66, and the average Q-factor is 40.71. Plotting the real and imaginary components of permittivity, permeability, and normalized input impedance allows one to investigate metamaterial behavior. Comparing the suggested structure to previously published multi-band absorbers, it was discovered that the former contains more absorption peaks and encompasses frequency spectra such as X, Ku, and K bands all at once. Validation of S-parameter/absorption is also reported through an experimental setup, and it shows good agreement with the simulated results.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4177 - 4192"},"PeriodicalIF":5.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149309571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-High Sensitivity Terahertz Dual-Parameter Sensing Based on Eccentric-Core Photonic Crystal Fiber","authors":"Yanyan Wang,&nbsp;Weihua Shi,&nbsp;Hui Zhao,&nbsp;Xiling Zheng","doi":"10.1007/s11468-026-03493-y","DOIUrl":"10.1007/s11468-026-03493-y","url":null,"abstract":"<div><p>To overcome the temperature cross‑sensitivity common in single‑parameter sensing, as well as the insufficient sensitivity and limited penetration depth of conventional near‑ and mid‑infrared sensors, this paper proposes an ultrahigh‑sensitivity THz dual‑parameter sensor based on an eccentric PCF. The proposed structure features an outer surface coated with a molybdenum disulfide (MoS₂) layer, which creates a surface plasmon resonance (SPR) sensing channel specifically designed for detecting refractive index. Simultaneously, a thermosensitive liquid is filled into the central air holes of the PCF, forming a directional coupling sensing channel dedicated to precise temperature measurement. Numerical simulations show that the two sensing channels exhibit low cross-sensitivity. Within the refractive-index range of 1.33–1.38, the SPR channel achieves an average refractive-index sensitivity of 1080.00 μm/RIU and an FOM of 100.93 RIU⁻¹. For temperatures ranging from − 20 to 40 °C, the directional-coupling channel achieves a temperature sensitivity of − 0.89 μm/°C and an FOM of 2805.50 RIU⁻¹. In addition, benefiting from the characteristics of terahertz-band plasmon‑like resonance, the sensor can theoretically achieve a penetration depth of tens of micrometers. With ultrahigh sensitivity and large penetration depth, the proposed dual‑parameter sensor provides a promising basis for biochemical sensing and trace detection.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4193 - 4205"},"PeriodicalIF":5.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149309423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermally Active Plasmonic Modes in Black Phosphorus Coated Semiconductor Nanowire","authors":"Saira Imran,&nbsp;Muhammad Zeshan Yaqoob,&nbsp;Ahtisham Ali,&nbsp;Majeed A. S. Alkanhal,&nbsp;Yasin Khan,&nbsp;Abdul Ghaffar","doi":"10.1007/s11468-026-03488-9","DOIUrl":"10.1007/s11468-026-03488-9","url":null,"abstract":"<div><p>Tunable Plasmonic modes have applications is sensing, computing, imaging, waveguides, filters, modulators and communication systems. In present work, the theoretical investigation on the temperature assisted tunability of the plasmonic-polaritonic modes supported by the black phosphorus (BP) coated temperature sensitive semiconductor nanowires has been carried out. The Indium Antimonide (InSb) has been taken as temperature sensitive semiconductor nanowire. The anisotropic conductivity of the BP layer was modeled using the random phase approximation (RPA) based semiclassical model for the armchair (AC) and zigzag (ZZ) orientations, while the extended Drude model was used to model the temperature-dependent dielectric constant of InSb. The dispersion curve, effective mode index (EMI), normalized phase speed, propagation loss and field distribution has been computed for the AC and ZZ plasmonic modes of BP. The influence of temperature and surface charge concentration on the plasmonic interactions for each configuration has been analyzed. Furthermore, a comparative analysis reveals that, for InSb at T = 240 K (insulating state), the plasmonic resonance frequency lies in the lower terahertz frequency range (0.1–1 THz), whereas at T = 400 K (metallic state), it shifts to the higher terahertz frequency range (5–6 THz). The plasmonic modes in ZZ orientation exhibits stronger response than the AC orientation. The numerical results demonstrate that the BP-coated InSb nanowire offers dual tunability of the guided plasmonic modes, with potential applications in the design of reconfigurable THz plasmonic waveguides, compact integrated photonic circuits, and actively tunable sensing devices.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4159 - 4175"},"PeriodicalIF":5.6,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149309477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphene-Based Metamaterial Absorber Supported with Machine Learning for Refractive Index Sensing Applications","authors":"Praveen Kumar Vishwakarma,&nbsp;Amrendra Kumar,&nbsp;Raghwendra Kumar","doi":"10.1007/s11468-026-03485-y","DOIUrl":"10.1007/s11468-026-03485-y","url":null,"abstract":"<div><p>The proposed study presents the numerical design, analysis, and optimization of a graphene-based metamaterial absorber operating in the optical to near-infrared spectral range. The absorber consists of an array of gold nanodisks placed on a monolayer graphene sheet backed by a gold substrate. Numerical simulations performed using CST Microwave Studio reveal a narrowband resonance centered at 698 nm with near-unity absorptance. This pronounced absorption arises from the excitation of localized surface plasmon resonances (LSPRs) and strong electromagnetic-field confinement in the vicinity of the gold nanodisks. The numerical results are further validated using coupled mode theory (CMT), showing excellent agreement with the simulated response. To accelerate the design and optimization process, six supervised machine learning (ML) regression models, namely K-Nearest Neighbors (KNN), CatBoost, XGBoost, Random Forest, Decision Tree, and Bagging regression, were developed using a dataset generated from CST simulations. Among the investigated models, the KNN regressor achieved the highest prediction accuracy with an <span>(R^2)</span> value exceeding 0.999 and an overall accuracy of approximately 99.9%. Furthermore, validation using an independent simulation dataset demonstrated excellent agreement between the predicted and simulated absorptance spectra, confirming the robustness and generalization capability of the proposed ML framework. The optimized absorber also exhibits excellent refractive index sensing performance, achieving a sensitivity of 505.2 nm/RIU and a figure of merit of 21.41, while successfully detecting various alcohols and hydrocarbon-based fuels such as diesel and gasoline (petrol). The combination of near-perfect absorption, high sensing performance, and machine learning-assisted optimization makes the proposed graphene-based metamaterial absorber a promising candidate for refractive index sensing, optical filtering, thermal emission control, photovoltaics, and integrated photonic devices.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4139 - 4157"},"PeriodicalIF":5.6,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strong Coupling of Plasmons and Excitons in Transition Metal Dichalcogenide Monolayers: Mechanisms, Plasmonic Material Platforms, and Emerging Applications","authors":"Ramzan Muhammad Faisal,&nbsp;Ahmad Irfan,&nbsp;Faoz H. Al-Atawi","doi":"10.1007/s11468-026-03486-x","DOIUrl":"10.1007/s11468-026-03486-x","url":null,"abstract":"<div><p>Strong coupling between surface plasmons and excitons in monolayer transition metal dichalcogenides (TMDCs) has become a central theme of modern nanophotonics, offering a route to engineer light-matter interactions at the nanometer scale and to realize new classes of photonic devices. When the energy exchange rate between a localized surface plasmon resonance and a TMDC exciton exceeds the combined dissipation rates of both subsystems, the two oscillators hybridize into mixed quasiparticles known as plexcitons, manifesting as an anticrossing in the optical spectrum and a measurable Rabi splitting. This review focuses specifically on TMDC monolayers as the excitonic medium; we first summarize the crystal structure, electronic band structure, and excitonic properties that make TMDCs uniquely suited to strong coupling, before synthesizing the theoretical foundations, coupled-oscillator and cavity quantum electrodynamics descriptions, and experimental realizations of TMDC-plasmon coupling across five classes of plasmonic architecture: metal nanoparticle arrays, individual nanostructure-monolayer hybrids, nanoprism-film and liquid-metal nanogap resonators, nanowire-monolayer hybrids, and guided-mode photonic structures. Reported Rabi splitting values across these platforms span almost an order of magnitude, from approximately 30 meV in guided-mode resonance structures to over 160 meV in deep-subwavelength nanogap cavities; this spread chiefly reflects differences in optical mode confinement and dipole orientation rather than inconsistent physics, a trend quantified here through comparative analysis of seven representative architectures together with more recent (2023–2025) advances. We further survey applications in photovoltaics, light-emitting devices, low-threshold lasing, surface-enhanced spectroscopies, and biosensing, critically evaluating what strong coupling adds beyond the weak-coupling regime already exploited in these fields, and identifying which applications currently lack direct TMDC-based demonstrations. Persistent challenges, including the lack of deterministic nanogap fabrication, limited room-temperature coherence times, the intrinsic optical losses of metallic plasmonic cavities, and the absence of a unified design framework connecting TMDC monolayers with precision plasmonic cavities, are identified as priorities for the field. This review is intended as a critical reference and roadmap for room-temperature TMDC-plexcitonic technologies.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4001 - 4025"},"PeriodicalIF":5.6,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quadruple Fano Resonances in Coupled Strip–Inverted-E Plasmonic Cavities for Refractive Index Sensing","authors":"Xinxin Ma,&nbsp;Xianghao Guo,&nbsp;Tong Li,&nbsp;Yilin Wang,&nbsp;Zhao Chen","doi":"10.1007/s11468-026-03484-z","DOIUrl":"10.1007/s11468-026-03484-z","url":null,"abstract":"<div><p>Fano resonance, characterized by its sharp asymmetric line shape and strong dispersion response, is regarded as an important mechanism for high-sensitivity nanophotonic sensing. Here, we demonstrate a plasmonic metal–insulator–metal (MIM) waveguide system that supports quadruple Fano resonances, stemming from the coherent interaction between the multimode discrete states of the strip–inverted-E composite cavity and the continuum state of the bus waveguide with a metal baffle. Then a modified multimode interference coupled-mode theory (MICMT) model is developed by considering the baffle-induced modulation and the variation of the continuous-state background, leading to good agreement with the finite element method (FEM) simulations. In terms of sensing performance, the maximum sensitivity of the original structure can reach 1660 nm/RIU. By introducing an arc-shaped cavity, it can be further enhanced to 1830 nm/RIU. Moreover, the proposed structure can be used for detecting the concentration of chemical solutions. This structure shows potential application value in multichannel Fano resonance regulation and on-chip high-sensitivity nanosensing.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 11","pages":"4111 - 4120"},"PeriodicalIF":5.6,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}