Plasmonics最新文献

{"title":"Enhancing Broadband NUV-Visible Polarization via Aluminum Nanogratings: A Comparative Study of Single and Bilayer Designs","authors":"Jinyu Guo,&nbsp;Hao Quan,&nbsp;Xinhao Wang,&nbsp;Shunben Wu,&nbsp;Zhaochen Wu,&nbsp;Jiajun Wang,&nbsp;Kangping Liu,&nbsp;Qiucheng Chen,&nbsp;Qingxin Wu,&nbsp;Lei Shi,&nbsp;Yifang Chen","doi":"10.1007/s11468-026-03381-5","DOIUrl":"10.1007/s11468-026-03381-5","url":null,"abstract":"<div><p>Subwavelength-metallic-grating based polarizers have been substantially demonstrated for polarimetric detection in infrared wavelengths. Fewer reports were seen for the applications in near-ultraviolet (NUV) so that achieving both high transmittance and high extinction ratio still remains a challenge. In this work, both single-layer and bilayer aluminum (Al) grating based polarizers operating in the near-ultraviolet (NUV) to visible range are designed and systematically studied. Through finite-difference time-domain (FDTD) simulations, Al is identified as the optimal metal, providing a favorable balance between plasmonic suppression of unwanted polarization and low-loss transmittance. It is further revealed that parabolic cross-section profile of grating lines, commonly formed during fabrication, induce a vertical effective-permittivity gradient that improves impedance matching and enhances transmittance, whereas ideal rectangular profiles provide higher extinction ratios. On the other hand, the bilayer Al/SiO₂/Al grating demonstrates enhanced transmittance, owing to local plasmonic resonance in Fabry-Perot cavity, maintaining strong extinction and improved fabrication tolerance. Related polarizers were fabricated by electron-beam lithography, metallization, lift-off and dry-etching, which exhibit broadband polarization performance consistent with FDTD simulations. These results clarify profile-dependent polarization mechanisms and establish Al nanogratings as a scalable and CMOS-compatible platform for high-performance NUV–visible polarizers.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 5","pages":"2721 - 2732"},"PeriodicalIF":5.6,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459042","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":"Single Spot Near-field Super-Focusing Planar Plasmonic Lens","authors":"Mayur S. Darak,&nbsp;Bhaveshkumar Kamaliya,&nbsp;Shobha Shukla,&nbsp;Rakesh G. Mote","doi":"10.1007/s11468-026-03379-z","DOIUrl":"10.1007/s11468-026-03379-z","url":null,"abstract":"<div><p>Ring structure yields a near-field split focal spot when excited with linearly polarized light. A single focal spot can be achieved by manipulating the phase of surface plasmon polaritons (SPPs) with strategically designed geometric modifications to the ring structure. In this work, we propose a planar slit based plasmonic lens for in-plane single-spot super-focusing of a linearly polarized light by manipulating the phase of SPPs with the aid of the unconventional modification in a slit geometry. The single-spot super-focusing is achieved by the introduction of unconventional slits in the symmetric ring structure for compensating the phase mismatch between the SPPs counter propagating from two sides of the ring. To analyze the focusing mechanism and plasmonic properties of the lens, finite-difference time-domain simulations are performed. The diffraction limit is beaten by focusing the light to a sub-wavelength region of approximately one-seventieth of the wavelength of incident light. An array of lens configuration is fabricated to illustrate the feasibility of the design. The proposed structure has potential applications in nanosensing, nanoimaging and nanolithography, wherein closely populated focused spots are desired using linearly polarized excitation.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 5","pages":"2697 - 2708"},"PeriodicalIF":5.6,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458699","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":"Correction: Analyzing Surface Plasmon Resonance as a Bio-Sensor through Simulating","authors":"Ali H. Attallah,&nbsp;Saja A. Ibrahim,&nbsp;Farah. J. Kadhum,&nbsp;Ali A. Dawood Al-Zuky","doi":"10.1007/s11468-026-03377-1","DOIUrl":"10.1007/s11468-026-03377-1","url":null,"abstract":"","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2555 - 2555"},"PeriodicalIF":4.3,"publicationDate":"2026-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148215036","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":"Influence of a Thin Dielectric Layer on the Electron Emission Properties of a Noble Metal Surface, the CuO/Cu Case","authors":"Édouard Rollin,&nbsp;Guilhem Saïz,&nbsp;Ludovic Douillard,&nbsp;John Cook,&nbsp;Martin Sparkes,&nbsp;William O’Neill,&nbsp;Nathaniel Lockwood,&nbsp;Andrew Greenwood","doi":"10.1007/s11468-026-03378-0","DOIUrl":"10.1007/s11468-026-03378-0","url":null,"abstract":"<div><p>Electron emission by a material surface under intense ultrashort pulsed laser light is actively studied for its application in various fields, from biochemistry to aerospace. Different strategies are proposed to push back against the electronic breakdown happening at high laser irradiance. Here, we investigate the effect of adding a thin dielectric top layer of copper oxide (CuO) on a noble plasmonic metal, copper (Cu), on the electron emission processes. Using a low energy and photoemission electron microscope (LEEM - PEEM), we measured, at a subwavelength spatial scale, electron emission spatial distribution and total electron energy distribution (TEED) of both pristine and thermally oxidized copper. We report that (i) the preferred electron emission sites on the surface correspond to step edge bunches and surface defects of the Cu lattice, (ii) the growth of a thin CuO layer improves the electron emission properties of Cu surface. The thin dielectric CuO coating is a source of near-field plasmon-polariton waveguiding and confinement in the immediate vicinity of the metal surface. The electron emission regime changes from a photoelectric weak field regime to a strong field tunnelling regime beyond a light irradiance threshold of 0.7 GW/cm² (0.073 V/nm). This irradiance threshold value is one order of magnitude lower than that required before thermal oxidation. Under equivalent illumination conditions (irradiance, exposure time) above a threshold irradiance, the total charge extracted from Cu with a CuO surface layer is 100 times greater than that of a clean metal.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2449 - 2458"},"PeriodicalIF":4.3,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11468-026-03378-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Study of Plasmonic Au-Ag-Pd Colloidal Nanoparticles via Pulsed Laser Ablation in Liquid for Ultrasensitive SERS Detection and Enhanced Antibacterial Activity","authors":"Abdul Subhan,&nbsp;Soumya Columbus,&nbsp;Karthigaimuthu Dharmalingam,&nbsp;Dali Vilma Francis,&nbsp;Abdel-Hamid Ismail Mourad","doi":"10.1007/s11468-026-03373-5","DOIUrl":"10.1007/s11468-026-03373-5","url":null,"abstract":"<div><p>Nanosecond Pulsed laser ablation in liquid (ns-PLAL) was utilized as a surfactant-free route to synthesize mono- (Au, Ag), binary- (AuAg, AuPd), and ternary (AuAgPd) nanoparticles in ultrapure water. The physicochemical properties of the colloids were systematically investigated to elucidate the influence of alloying on optical and functional performance. Optical measurements showed a pronounced localized surface plasmon resonance for Ag nanoparticles, whereas Pd incorporation led to progressive plasmon damping in alloyed systems. Electron microscopy confirmed predominantly spherical to quasi-spherical nanostructures with moderate polydispersity, and X-ray diffraction indicated a crystalline face-centered cubic (FCC) phase for all compositions. Zeta-potential analysis revealed stable negatively charged colloids. High-speed imaging of the ablation process demonstrated strong laser–matter interaction characterized by shockwave formation and rapid particle ejection in the liquid environment. Surface-enhanced Raman spectroscopy (SERS) using Rhodamine 6G as a probe molecule showed signal enhancement for all nanoparticle systems, with Ag colloids exhibiting exceptional sensitivity and a detection limit down to 10⁻⁹ M, along with the first report of PLAL prepared ternary colloidal (AuAgPd) nanoparticle system towards R6G detection. Furthermore, antibacterial evaluation against both Gram-positive and Gram-negative bacteria (resazurin assay) revealed superior antimicrobial activity for the ternary AuAgPd nanoparticles, achieving minimum inhibitory and bactericidal concentrations as low as 2.3 µg mL⁻¹ against E. coli. These findings demonstrate that PLAL-derived nanoparticles, provide ultrasensitive molecular detection, and strong antibacterial activity, highlighting their promise as multifunctional materials for sensing and environmental remediation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2499 - 2519"},"PeriodicalIF":4.3,"publicationDate":"2026-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214973","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":"An Ultra-Compact Unequal Power Division Ratio Power Divider Based on Spoof Surface Plasmon Polaritons","authors":"Runfeng Tang,&nbsp;Jianfeng Shi,&nbsp;Wenzhuo Li,&nbsp;Shuyu Li,&nbsp;Zhe Chen","doi":"10.1007/s11468-026-03374-4","DOIUrl":"10.1007/s11468-026-03374-4","url":null,"abstract":"<div><p>With the rapid development of 5G communications and millimeter-wave RF front-end technologies, microwave integrated systems impose increasingly stringent requirements on power dividers in terms of miniaturization, unequal power-division flexibility, filtering functionality, and port isolation performance. To address the limitations of conventional unequal power dividers in structural compactness and performance balance, this paper proposes an ultra-compact filtering power divider with unequal power-division ratio based on spoof surface plasmon polaritons (SSPPs). By leveraging the strong field confinement and inherent low-pass filtering characteristics of SSPPs, the proposed device integrates filtering and power division functions into a single compact structure, realizing a 1:2 unequal power division with an ultra-compact footprint of only <span>(varvec{0.46} times varvec{0.82 lambda _g^2})</span>. Furthermore, through optimized structural topology and impedance matching design, the isolation between output ports is significantly enhanced up to 26.5 dB, while excellent transmission characteristics and impedance matching are maintained. The designed power divider integrates ultra-compact size, filtering response, unequal power distribution, and high isolation, making it well suited for applications in 5G RF front-end systems and high-density microwave integrated circuits. The proposed approach provides a feasible and effective solution for the design of high-performance compact unequal filtering power dividers.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2393 - 2405"},"PeriodicalIF":4.3,"publicationDate":"2026-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148215051","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":"Plasmon-Compatible Ultraviolet Optical Response and Excitation-Tunable Emission in Chromium(III) Tris(8-Hydroxyquinoline) Nanoparticles","authors":"V. Bharathi Devi,&nbsp;J. Christina Rhoda,&nbsp;Helen Merina Albert,&nbsp;Santosh Kumar Nathsharma,&nbsp;P. Divya,&nbsp;J. P. Suchitra","doi":"10.1007/s11468-026-03376-2","DOIUrl":"10.1007/s11468-026-03376-2","url":null,"abstract":"<div><p>In this work, we prepared Chromium(III) tris(8-hydroxyquinoline) (CrQ₃) nanoparticles (NPs) using a simple precipitation method and systematically characterized to examine the structural and optical features relevant to plasmon–enhanced nanophotonic applications. The crystallinity of the coordination compound was confirmed using powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM) showed aggregated grains at the nanoscale. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) investigations validated the synthesis of crystalline quasi-spherical nanoparticles with partial agglomeration and an average particle size of 23.2 ± 3.6 nm. UV-visible absorption spectrum showed a strong UV absorbance band at 247 nm, which is ascribed to a plasmon-compatible optical response probably originating from coupling between ligand-centred and metal-centred electronic states. The estimated shallow penetration depth in the UV region reflects localization of the electromagnetic field and a significant light-matter interaction within plasmon-compatible materials. Optical bandgap analysis revealed a wide bandgap of 4.46 eV and the Urbach energy of 0.83 eV, indicating the presence of defect-induced localized states that contribute to sub-bandgap absorption. The photoluminescence analysis showed excitation-dependent emission in the green (516 nm) to near-infrared (784 nm) ranges, suggesting multiple emissive pathways suitable for plasmon-exciton coupling. The integrated optical confinement, plasmon-like UV response, and tunable emission properties make CrQ₃ nanoparticles a promising active material in plasmon-enhanced photonic devices, such as ultraviolet photodetectors, plasmon-enhanced light emitters and hybrid plasmonic-organic nanoparticles.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2437 - 2447"},"PeriodicalIF":4.3,"publicationDate":"2026-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214942","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":"MXene–CeO2 Nanorod-Based Optical Biosensor for Ochratoxin A Detection in Real Food Samples","authors":"Huibo Han,&nbsp;Ragini Singh,&nbsp;Ben Niu,&nbsp;Penglei Zhou,&nbsp;Bingyuan Zhang,&nbsp;Santosh Kumar","doi":"10.1007/s11468-026-03375-3","DOIUrl":"10.1007/s11468-026-03375-3","url":null,"abstract":"<div><p>Ochratoxin A (OTA) is a potentially harmful mycotoxin that is widely found in agricultural products and animal by-products. In order to ensure our physical health, OTA testing is very important. Therefore, we chose to use an optical fiber biosensor based on the principle of local surface plasmon resonance (LSPR), and we designed an asymmetric optical fiber structure using single-mode optical fiber (SMF) to detect different concentrations of OTA. Gold nanoparticles (AuNPs) were applied to the sensing region to stimulate the LSPR effect, and then Nb₂CTxMXene and CeO₂-nanorods were sequentially fixed on the probe to change the dielectric environment around the sensing region to improve the performance of the sensor. The sensor has a linear range of 0.5 ng/mL to 60 ng/mL, a sensitivity of 0.0805 nm/(ng/mL), and a limit of detection (LOD) of 3.95 ng/mL. After that, we evaluated it through a series of tests, including repeatability, reproducibility, pH, stability, and selectivity. Finally, we also tested and verified the real samples. According to the experimental results, the sensor shows good performance in OTA detection, indicating that the sensor has good application potential and broad development prospects. This work designed an asymmetric optical fiber biosensor based on LSPR, achieving a broad detection range and a low LOD for OTA detection by coating with AuNPs, Nb₂CTxMXene, and CeO₂-nanorods. Its reliability and vast prospects in practical applications were validated through repeatability, stability, and real sample testing.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2379 - 2392"},"PeriodicalIF":4.3,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148215050","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":"Energy Transfer Due to Second Harmonic Generations in Metallic and Semiconductor Nanohybrids","authors":"Shashankdhwaj Parihar,&nbsp;Mahi R. Singh,&nbsp;Sergey G. Yastrebov","doi":"10.1007/s11468-026-03370-8","DOIUrl":"10.1007/s11468-026-03370-8","url":null,"abstract":"<div><p>We have developed a theory for energy transfer between metallic and semiconductor nanoparticles due to the second harmonic generation (SHG). We have considered a plasmonic nanohybrid made of metallic and semiconductor nanoparticles that are separated by a dielectric layer. These particles are interacting with each other via surface plasmon polaritons (SPP) and dipole-dipole interaction (DDI). The SHG intensity due to energy transfer is calculated by using the nonlinear quantum density matrix method in the presence of the SPP and DDI polaritons. These SHG expressions can be useful for scientists and engineers to design and perform new experiments such as laser-induced plasmon heating and plasmonic photothermal therapy in brain tissues. Next, we have performed numerical simulation for the SHG intensity due to energy transfer from metallic to semiconductor nanoparticles. We found that there is enhancement in the intensity when the thickness of the layer is decreased. The enhancement is due to an extra contribution from the SPP and DDI polaritons. Further, we have compared our theory with experimental data due to the energy transfer between the Au-metallic and CuS-semiconductor nanoparticles separated by <span>(:{Al}_{2}{O}_{3})</span> layer. A good agreement between theory and experiment is found with <span>(::{R}^{2}=0.96)</span>. The enhancement in the SHG intensity can be used to design and fabricate plasmonic nanosensors for the applications in nanotechnology and nanomedicine.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2521 - 2530"},"PeriodicalIF":4.3,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214974","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":"Porous anodic alumina waveguide plasmon sensors: influence of structural parameters on sensing performance","authors":"George Tassis,&nbsp;Anastasia Christoulaki,&nbsp;Nikolaos Spiliopoulos","doi":"10.1007/s11468-026-03366-4","DOIUrl":"10.1007/s11468-026-03366-4","url":null,"abstract":"<div><p>A comparative study of thin porous anodic alumina (PAA) plasmonic sensors is presented. Coupled plasmon–waveguide resonance spectroscopy and scanning electron microscopy are employed to investigate the structural parameters governing the sensing performance of PAA-based waveguide configurations. Partial electrochemical anodization of thin aluminum films deposited on glass substrates produces an Al/Al₂O₃ interface that supports surface electromagnetic modes, while the resulting porous anodic alumina layer provides enhanced detection efficiency mainly due to its increased active surface area. The influence of key geometrical parameters - namely PAA thickness, pore radius, and porosity - on the optical response of the sensor is systematically examined, and corresponding calibration curves are established. In addition, Bruggeman effective medium theory is applied to model the effective dielectric properties of the porous layer and to fit in situ reflectance measurements during pore widening. The quantitative agreement between optical modeling and independent morphological SEM characterization demonstrates that this approach provides a framework for quantifying mass adsorption in porous waveguide plasmon sensors.</p><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 4","pages":"2477 - 2485"},"PeriodicalIF":4.3,"publicationDate":"2026-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148215054","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}