Plasmonics最新文献

{"title":"Ultra-High Sensitivity Terahertz Detection Using a 2D-Material-Based Metasurface: Design, Tuning, and Machine Learning Validation","authors":"Vinoth R,&nbsp;Gunasekaran Thangavel,&nbsp;Jacob Wekalao,&nbsp;Amuthakkannan Rajakannu","doi":"10.1007/s11468-025-03118-w","DOIUrl":"10.1007/s11468-025-03118-w","url":null,"abstract":"<div><p>The quantification of dopamine, a critical catecholamine neurotransmitter, remains a significant challenge in neurological research and clinical diagnostics due to its low physiological concentrations and interference from structurally similar compounds. This study presents a simple metasurface sensor employing graphene-enhanced surface plasmon resonance for ultra-sensitive dopamine detection. Finite element method simulations using COMSOL Multiphysics 6.2 demonstrate exceptional performance with a maximum sensitivity of 500 GHzRIU⁻¹ at 0.805 THz, achieving a figure of merit of 2.110 and quality factor ranging from 3.376 to 3.435. The sensor exhibits tunable response through graphene chemical potential modulation (0.1–0.9 eV), with transmittance varying from 81.6% to 16.4%. Angular stability analysis reveals consistent performance across incidence angles from 0° to 80°. Machine learning integration using XGBoost regression achieves 92–100% prediction accuracy, enabling real-time performance optimization. The proposed sensor surpasses existing designs in sensitivity while maintaining broad refractive index detection range,positioning it as a promising platform for advanced neurochemical sensing applications in Parkinson's disease, schizophrenia, and substance abuse disorder diagnostics.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6139 - 6150"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923240","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":"Quantum Feedback-Enhanced Discord in V-Shaped Plasmonic Waveguides","authors":"Hossein Sadeghi,&nbsp;Mehdi Mirzaee","doi":"10.1007/s11468-025-03121-1","DOIUrl":"10.1007/s11468-025-03121-1","url":null,"abstract":"<div><p>This theoretical and numerical investigation explores the enhancement and preservation of quantum discord in quantum systems coupled through V-shaped plasmonic waveguides (V-PW) using advanced quantum feedback control techniques. We demonstrate that properly engineered quantum feedback can significantly improve quantum discord preservation, particularly in Werner states where we observe enhancements from zero to 0.38 under optimal conditions. The mechanism involves a sophisticated confinement of the quantum state within protected subspaces that are resilient against environmental decoherence. Through detailed theoretical modeling and extensive numerical simulations, we identified the key parameters governing this enhancement process, including waveguide geometry, emitter positioning, and feedback timing. Our results reveal three distinct quantum discord decay temporal regimes and establish optimal operating conditions for maximal quantum correlation preservation. The findings provide fundamental insights into quantum correlation dynamics in nanophotonic systems and practical guidelines for experimental implementations in quantum information processing applications, with particular relevance to room-temperature quantum technologies.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6131 - 6138"},"PeriodicalIF":4.3,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923234","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":"Spectral and Modal Tuning of Surface Plasmons in Symmetric Nanocomposite–Metal Configurations","authors":"Vivek Saxena","doi":"10.1007/s11468-025-03054-9","DOIUrl":"10.1007/s11468-025-03054-9","url":null,"abstract":"<div><p>This study presents a detailed investigation into the dispersion and confinement characteristics of surface plasmon polaritons (SPPs) in a symmetric waveguide architecture composed of nanocomposite–metal–nanocomposite (NMC–M–NMC) layers. The nanocomposite claddings incorporate metallic nanoparticles, enabling the simultaneous excitation of propagating surface plasmon modes and localized plasmon resonances. This coupling mechanism leads to superior field confinement and an extended modal wavevector range compared to conventional metal–insulator–metal (MIM) waveguides. The resulting structure supports both long-range SPP (LRSP) and short-range SPP (SRSP) modes, each exhibiting distinct advantages: LRSP modes offer reduced propagation losses and longer transmission distances, while SRSP modes exhibit tight spatial confinement around the metallic core. A key feature of the proposed system is its tunability, achieved by varying the nanoparticle characteristics—such as radius, volume fraction, and interparticle spacing—as well as the thickness of the central metal layer. This flexibility allows dynamic control over the effective wavelength and intensity distribution of the plasmonic modes, making the structure highly adaptable to a wide range of optical design requirements. To further elucidate the material influence on SPP behavior, comparative simulations are performed using two representative nanocomposite systems: silver–silica and gold–alumina. These comparisons reveal material-specific differences in mode dispersion and confinement, thereby providing valuable guidance for material selection in plasmonic device engineering. The demonstrated ability to manipulate SPP propagation and confinement through structural and material parameters underscores the potential of the NMC–M–NMC configuration in advanced photonic applications. In particular, this platform shows strong promise for integration into nanophotonic circuits, plasmonic sensors, optical modulators, and subwavelength light guiding components within next-generation optoelectronic systems.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6115 - 6130"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923216","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":"Tuning Viscosity and Spin Time to Enhance the Thinnest rGO Film Coating in SPR Sensors","authors":"Masruroh,&nbsp;Ghaitza Aqshal Maulana,&nbsp;Imam Mahdi Syarifuddin,&nbsp;Freygieon Ogiek Rizal Sukma,&nbsp;Mahardika Auditia Hanif,&nbsp;Gancang Saroja,&nbsp;Rachmat Triandi Tjahjanto,&nbsp;Dionysius J. D. H. Santjojo","doi":"10.1007/s11468-025-03110-4","DOIUrl":"10.1007/s11468-025-03110-4","url":null,"abstract":"<div><p>This study examined the optimization of the solution viscosity and spin-coating time to produce thin and uniform rGO layers for surface plasmon resonance (SPR) sensor applications. The viscosity of the rGO solution was controlled by varying the concentration of ascorbic acid as a reducing agent in the rGO synthesis process. Then, characterization was performed using FESEM-EDX, TEM, and thickness and roughness measurements using a topography measurement system (TMS). The characterization results demonstrated that increasing the solution viscosity was directly proportional to the layer thickness, roughness, and the percentage of carbon elements, as determined by EDX mapping. The SEM and TEM analyses revealed a surface morphology that resembled wrinkled paper structures, which overlapped and folded. The SAED pattern indicated the presence of crystallinity relating to the (002), (100), and (110) crystal planes. In addition, as the spin-coating time increased, the thickness and roughness of the layer decreased; however, the thickness-to-roughness ratio increased. SPR sensor testing with the rGO layer was also conducted using ethanol solution analytes with concentrations ranging from 0 to 20%. The results demonstrated that the SPR sensor with the rGO layer exhibited a sensitivity of 2481.42 nm/RIU and a linearity of <i>R</i>² = 0.96.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6105 - 6114"},"PeriodicalIF":4.3,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923215","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":"High Sensitivity SPR Refractive Index Sensor Based on D-shaped PCF with Ge-doped SiO2 Core","authors":"Qingcheng You,&nbsp;Yi Zhou,&nbsp;Yukun Zhu,&nbsp;Licui Ji,&nbsp;Yichen Li,&nbsp;Bin Li,&nbsp;Xu Gao,&nbsp;Xing Wang,&nbsp;Honggang Pan","doi":"10.1007/s11468-025-03101-5","DOIUrl":"10.1007/s11468-025-03101-5","url":null,"abstract":"<div><p>In this study, a D-shaped photonic crystal fiber (PCF) sensor with surface plasmon resonance (SPR) was designed with Ge-doped Si as the fiber core. The surface plasmon wave was excited by gold plating on the D-shaped surface. Numerical simulations by the finite element method (FEM) show that this sensor can realize a wide detection range of refractive index (RI) measurement from 1.330 to 1.445. The maximum wavelength sensitivity (WS) is 45,600 nm/RIU, and the maximum accuracy is 2.19 × 10⁻⁶ RIU. Compared with the sensor with a pure SiO₂ fiber core, the maximum WS is increased by about 2.87 times, and the average WS is increased by 20.6%. The proposed sensor is characterized by a simple structure, high sensitivity, and a large detection range, which has great potential in cell activity monitoring, food additives, and residue detection.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6095 - 6104"},"PeriodicalIF":4.3,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923144","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":"Refractive Index Sensing-Based Surface Plasmon Resonance Sensor for Sensitivity Enhancement: Theoretical Analysis","authors":"Gufranullah Ansari,&nbsp;Prakash Kanjariya,&nbsp;M. Sudhakara Reddy,&nbsp;Satish Choudhury,&nbsp;Helen Merina Albert,&nbsp;Irwanjot Kaur,&nbsp;Vikas Rathi,&nbsp;Fadhil Faez Sead,&nbsp;Yash Sharma,&nbsp;Aashna Sinha,&nbsp;Arun Uniyal","doi":"10.1007/s11468-025-03082-5","DOIUrl":"10.1007/s11468-025-03082-5","url":null,"abstract":"<div><p>Surface plasmon resonance (SPR) sensors are essential for detecting several applications because of their high sensitivity and real-time analysis capabilities. This paper’s proposed sensor incorporates the CsF prism, gold (Au), silicon nitride (Si₃N₄), and zirconium nitride layers to detect the various applications. Au, which has excellent plasmonic qualities, greatly increases sensitivity. Additionally, incorporating Si₃N and ZrN, which have remarkable optical and electronic properties, improves signal enhancement by increasing light-matter interaction. The proposed sensor analyzes performance using the transfer matrix method (TMM) and Kretschmann configuration, which is based on Fresnel’s equation. At RI of 1.33–1.35 sensing analyte has the following maximum sensitivities (S) and figure of merits (FoM): 281.58, 294.44°/RIU and 38.85/RIU, 45.93/RIU with/without ZrN layer at remarkable minimum reflectance, respectively. According to the study, combining Si₃N₄ and ZrN materials with conventional plasmonic metals can improve sensitivity while serving as a platform for additional medical diagnostics and environmental monitoring.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6083 - 6094"},"PeriodicalIF":4.3,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923204","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":"A Terahertz Photonic Crystal Fiber Sensor for Enhanced Protein Level Detection","authors":"Dana N. Alhamss,&nbsp;Abdulkarem H. M. Almawgani,&nbsp;Adam R. H. Alhawari,&nbsp;Malek G. Daher,&nbsp;Sofyan A. Taya,&nbsp;Yousif S. Adam,&nbsp;Hussein S. Gumaih,&nbsp;Anurag Upadhyay,&nbsp;Shivam Singh","doi":"10.1007/s11468-025-03070-9","DOIUrl":"10.1007/s11468-025-03070-9","url":null,"abstract":"<div><p>Proteins play a crucial role in tissue formation and repair, making their accurate detection essential for biomedical applications. This study presents a square-core photonic crystal fiber sensor (SCPCFS) designed for the sensitive detection of protein concentrations in aqueous solutions. Zeonex is selected as the background material due to its superior optical characteristics in the terahertz (THz) frequency range. Operating within the 0.8–2.2 THz band, the sensor achieves high relative sensitivity at 1.6 THz, with values of 97.667%, 98.33%, 98.781%, 99.072%, and 99.242% corresponding to protein concentrations of 15%, 30%, 45%, 60%, and 75%, respectively. The associated confinement loss values are notably low—4.56, 9.89, 2.26, 5.87, and 2.25 cm⁻¹—indicating minimal signal attenuation. Furthermore, the SCPCFS demonstrates excellent performance across other key optical metrics. Its simple geometric structure facilitates fabrication using current technologies. These features highlight the sensor’s potential for reliable, real-time, and highly sensitive protein concentration monitoring in biomedical and biochemical applications.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6049 - 6059"},"PeriodicalIF":4.3,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923198","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":"Probing the Physical and Antibacterial Features of SiO2@MoS2 Nanoparticle-Embellished PEO/Sodium Alginate/PVA Matrix for Sunscreens, Energy Storage, Food Preservation, and Unique Plasmonic Applications","authors":"Zainab Jawad Kadhim,&nbsp;Ehssan Al-Bermany,&nbsp;Aya A. Shaher,&nbsp;N. A. Al-Ali,&nbsp;Karar Abdali,&nbsp;Alaa Nihad Tuama","doi":"10.1007/s11468-025-03055-8","DOIUrl":"10.1007/s11468-025-03055-8","url":null,"abstract":"<div><p>Herein, MoS₂-50 nm was integrated with SiO₂-50 nm utilizing a solid-state reaction process (SSRP). Various weight proportions of SiO₂@MoS₂ composite-reinforced nanoparticles (CRNPs) were presented into a ternary polymeric matrix (TPM) comprising PEO, sodium alginate, and PVA by the casting process. SEM findings revealed that PEO/sodium alginate/PVA had a well-ordered and homogenous surface topography with microcracks and cavities. Nonetheless, the improved dispersion of CRNPs without accumulating into TPM resulted in a stable dropping in holes and cracks. XRD patterns corroborated the crystallographic descriptions, revealing the semi-crystalline structure for all composite films. The average crystallite size declined from 21.685 nm (S₀) to 17.961 nm (S₂) and subsequently developed with CRNPs incorporation to 21.926 nm (S₃) and 23.289 nm (S₄), with a nominal average lattice strain of 3.689 × 10⁻³ after integration. The optical results showed an enormous upturn in optical absorbance values coupled by appearances of surface plasmonic resonance at about (651 nm) upon CRNPs integration technique. Enclosure of CRNPs resulted in considerable decline in direct and indirect bandgap values from 5.2 to 1.8 eV and 2.5 to 1.1 eV, respectively, and such results are almost identical to dielectric constants. Extraordinarily, dielectric values improved with the development of CRNP addition and frequency values. Fabricated membranes demonstrate significant antibacterial effect, with greatest zone improvement (<i>D</i> = 20–26 mm) for <i>Escherichia coli</i> and (<i>D</i> = 22–37 mm) for <i>Staphylococcus</i>, resulting in the bacteria being thawed inside the inhibition zones. The resultants are considered key for sunscreens, energy storage, food preservation, and unique plasmonic applications.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6061 - 6081"},"PeriodicalIF":4.3,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923199","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":"Four-port Silicon-Graphene Built Frequency Agile Circularly Polarized Nano-plasmonic Antenna in THz Regime with Bidirectional Pattern Diversity","authors":"M. Lakshmi Narasimha Charyulu,&nbsp;M. Ramana Reddy,&nbsp;Vivek Singh Kushwah,&nbsp;P. Narahari Sastry,&nbsp;A. Krishna Kumar,&nbsp;Kapil Jain","doi":"10.1007/s11468-025-03065-6","DOIUrl":"10.1007/s11468-025-03065-6","url":null,"abstract":"<div><p>This paper develops the 4-port graphene-silicon antenna in the THz frequency range. Two-diagonally placed S-formed patches excited silicon ceramic, and two stair aperture excited silicon pieces make up the designed multi-port radiator. To lessen the disruption from the field elements, these two distinct kinds of antenna components are designed to illuminate in complementary directions. This feature could potentially provide a stable wireless connection. With the assistance of change in the chemical potential of graphene coating, the proposed aerial becomes frequency tunable. Circular waves are produced from all ports in such a way (polarization diversity) to advance the separation level and diversity functioning. Designed THz aerial works in between 3.2 and 3.82 THz having inter-port separation above 30 dB. The observed coinciding axial ratio (AR) range of the suggested multi-port aerial is 0.4 THz (3.38–3.78 THz). This design may be used for THz built 6G communication systems because of all these qualities.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6037 - 6047"},"PeriodicalIF":4.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923194","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 Optimization of a Novel SPR Sensor for Detecting Cancerous Cells: A Simulation-Based Study","authors":"Bhishma Karki,&nbsp;Amrindra Pal,&nbsp;Arun Uniyal,&nbsp; Manashree,&nbsp;Pushkar Jassal,&nbsp;Aashna Sinha","doi":"10.1007/s11468-025-03057-6","DOIUrl":"10.1007/s11468-025-03057-6","url":null,"abstract":"<div><p>This numerical work uses a surface plasmon resonance (SPR)-based Kretschmann sensor structure to examine early cancer detection. The proposed optical sensor is intended to identify different types of cancer-infected cells in the human body with refractive indices (RIs) between 1.38 and 1.401. It performs well across various RI changes, including biological solutions. The sensor is designed and analyzed using a MATLAB simulation platform based on the transfer matrix method (TMM). Characteristic parameters like sensitivity (S), full width at half maximum (FWHM), detection accuracy (DA), and figure of merit (FoM) are used to assess the suggested SPR sensor’s performance. With a maximum FoM of 166.07 RIU⁻¹ and DA of 0.465°⁻¹, the numerical findings demonstrate that the developed sensor can detect skin, cervical, blood, adrenal gland, and type I and type II breast cancer with a sensitivity of 200, 245.83, 257.14, 303.57, 353.57, and 357.14°/RIU, respectively. Based on the obtained results, we think that the proposed SPR sensor may find use in medical science for early cancer detection, which would open up new possibilities in the biosensing sector.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"6027 - 6035"},"PeriodicalIF":4.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923137","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}