Plasmonics最新文献

{"title":"Highly Sensitive Black Phosphorus–Layered SPR-PCF Refractometric Sensor","authors":"Plakshi Gupta,&nbsp;Akash Khamaru,&nbsp;Ajeet Kumar","doi":"10.1007/s11468-024-02723-5","DOIUrl":"10.1007/s11468-024-02723-5","url":null,"abstract":"<div><p>This work presents a D-shaped surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) sensor with a coating of gold-TiO₂ as a plasmonic material along with black phosphorus (BP) nano-films which works as a sensitivity enhancer functioning in visible to near-infrared spectrum. The affixed BP layers offer a direct bandgap, consequently advancing the proposed sensor’s performance. The designed sensor is employed for the detection of a broad range of refractive indices limiting from 1.3–1.4. Various fabrication procedures are discussed for layering of BP films on the PCF surface such as liquid peeling and pulsed laser precipitation technique. Along with the influence of BP layers, the thickness of gold and TiO₂ is also optimized for the extraction of favorable outputs. The dimensions of respective cladding air holes of the PCF are also influenced to assess the effectiveness of the proposed sensor. The dynamic sensitivity of the proposed sensor elevated from 9000 to 23,300 nm/RIU with the incorporation of the BP films in the designed PCF RI detector. Additionally, a high amplitude sensitivity of 7446.56 RIU⁻¹ is also achieved. The theoretical structure is numerically analyzed using the finite element method in COMSOL Multiphysics Software. The extracted enhanced sensitivity perfectly elaborates the efficacy of the BP layers in the PCF-SPR RI sensor and builds our suggested sensor as a prospective participant in modern plasmonic sensors.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7143 - 7153"},"PeriodicalIF":4.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090694","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":"Optical Properties of Non-Aligned Metallic Heterogeneous Dimer Systems","authors":"Mohammed Alsawafta","doi":"10.1007/s11468-025-02776-0","DOIUrl":"10.1007/s11468-025-02776-0","url":null,"abstract":"<div><p>The optical properties of a non-aligned Ag-Au nanorod dimer arranged in the end-to-end configuration are calculated by employing the Finite-Difference Time-Domain (FDTD) analytical tool under illumination of a longitudinally polarized light. The spectral responses of the heterodimer are computed at different gap spacings (<i>g</i>) and various transverse shifts (<i>h</i>). From the results of the simulations, it is found that the plasmon mode excited in Au exhibits more sensitivity to any change in either <i>g</i> or <i>h</i> than the Ag mode. The calculated fractional plasmon shift of the Au mode decays with <i>h</i> scaled to the rod width (h/w), and it follows a logistic function trend. Furthermore, the fraction plasmon shift is investigated as a function of <i>g</i> in units of the rod width (g/w) at various values of <i>h</i>, and it is found that it decays exponentially with gap separation but unexpectedly with a variant decay constant that strongly depends on <i>h</i>. These findings contradict the invariant decay constant of 0.2 predicted by the universal scaling behavior in homodimer systems. The current findings provide comprehensive guidelines for the theoretical prediction of the spectral response of non-aligned heterogeneous dime systems.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7109 - 7120"},"PeriodicalIF":4.3,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090500","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":"Electrical and Thermoelectric Characteristics of Organic Single Molecular Junctions: The Role of Anchoring Groups","authors":"Ahmed K. Ibrahim,&nbsp;Alaa A. Al-Jobory,&nbsp;Nabeel F. Lattoofi","doi":"10.1007/s11468-025-02775-1","DOIUrl":"10.1007/s11468-025-02775-1","url":null,"abstract":"<div><p>In this work, we present a computational study of organic single molecular junctions by analyzing the electrical and thermoelectric properties of the Thienoisoindigo molecule, which are symmetrically and asymmetrically anchored to gold electrodes through various edge groups. To this end, we employ an ab initio method with density functional theory (DFT). The transmission coefficient’s results display that the type of anchoring groups affects the behavior of the molecular junctions. Molecules with symmetric anchoring groups show the highest occupied molecular orbital (HOMO) dominates in the molecular configuration with an S−S anchor. However, the lowest unoccupied molecular orbital (LUMO) dominates in molecular systems with N−N and NH<span>(_2)</span>−NH<span>(_2)</span> anchors. Another influence of the anchoring groups on the molecule’s properties is their effect on the bandgap, and it shifts gradually toward the blue region by changing the edges from S−S to NH<span>(_2)</span>−NH<span>(_2)</span> and N−N, respectively. In the case of molecules with asymmetric anchors, the HOMO dominates in molecules with the S−NH<span>(_2)</span> one, while the LUMO is dominant in molecules with S−N and N−NH<span>(_2)</span> anchors. In addition, the bandgap decreases through changing the edges from N−NH<span>(_2)</span> to S−NH<span>(_2)</span> and reduces more (red-shift) with S−N anchors. Seebeck coefficient calculations also exhibit anchor-dependency. For symmetric anchors, the behavior of molecules with S−S shows <i>p</i>-type conduction. It can shift to an <i>n</i>-type one by replacing the edges with N−N or NH<span>(_2)</span>−NH<span>(_2)</span>. However, molecules with asymmetric anchors transition from <i>p</i>-type to <i>n</i>-type behavior by exchanging the S−NH<span>(_2)</span> with S−N or N−NH<span>(_2)</span> anchors. The obtained results demonstrate the significant role of anchoring groups in controlling the behavior of organic single molecular junctions, which could contribute to developing innovative applications in molecular electronic devices.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7101 - 7108"},"PeriodicalIF":4.3,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090504","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 Analysis of Twin-Core Side-Polished SPR PCF Sensor for Preliminary Malaria Detection","authors":"Devi Kangan B S,&nbsp;Akash Khamaru,&nbsp;Ajeet Kumar","doi":"10.1007/s11468-024-02713-7","DOIUrl":"10.1007/s11468-024-02713-7","url":null,"abstract":"<div><p>This paper proposes a double-side polished twin-core photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor for early-stage detection of malaria. The analysis and the assessment of the proposed sensor are done by finite element method using the COMSOL Multiphysics software. The dual-side polished structure reduces the distance between the metal layer and core mode, thereby enhancing the sensor performance due to the strong coupling between them. The air holes arrangement resembles the shape of an “hourglass” which helps to confine light energy within the twin cores. A layer of gold, a preferred plasmonic material, is coated on the symmetrically polished surface of the PCF to induce SPR. Due to distinction in the refractive indices, the resonance wavelength is different for infected and normal red blood cells (RBCs). The analysis is done for infected RBCs (ring phase, trophozoite phase, and schizont phase). The structural parameters are optimized precisely and a maximum wavelength sensitivity of 26,428.57 nm/RIU was achieved for the ring phase, 16,052.6 nm/RIU for the trophozoite phase, and 12,586.2 nm/RIU for the schizont phase. The numerical analysis also shows that the sensor possess high figure-of-merit (FOM) values of 334.54 RIU⁻¹, 321.05 RIU⁻¹, and 381.40 RIU⁻¹ for the ring, trophozoite, and schizont phases, respectively. These results confirm the potential of the proposed sensor and also justify its betterment than the existing methods. Due to its promising sensing performance and appropriate FOM value, the proposed sensor is suitable for the early-stage malaria detection.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7069 - 7080"},"PeriodicalIF":4.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090343","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 Simulation of a D-Shaped Plasmonic Biosensor Utilizing Dual-Core Photonic Crystal Fiber","authors":"Mohammad Azadi,&nbsp;Masoud Mohammadi,&nbsp;Saeed Olyaee,&nbsp;Mahmood Seifouri","doi":"10.1007/s11468-025-02769-z","DOIUrl":"10.1007/s11468-025-02769-z","url":null,"abstract":"<div><p>A surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) for the detection of various analytes through surface plasmon has been proposed in this study. In this biosensor, the main workmanship of the structure is based on the coupling between the fundamental mode of the photonic crystal fiber and the plasmonic mode, which creates the resonance wavelength at different refractive index (RI) of the analyte. In this design, the plasmonic material silver (Ag) is deposited between the PCF and the analyte to detect the RI changes of the analyte, and considering that silver oxidizes quickly, a thin layer of titanium dioxide (TiO₂) is placed between the silver and the PCF; this solves the problem and strengthens the adhesion of silver on the fiber. For the optimal and suitable analysis of the performance of the proposed biosensor, the thickness of the structure layers, the lattice constant, and the diameter of the air holes of the structure have been analyzed. In this proposed biosensor, the maximum wavelength sensitivity is 10,000 nm/RIU, and the amplitude sensitivity is 250 RIU⁻¹, and this structure has provided a maximum resolution of 2 × 10⁻⁵ RIU in the RI of an analyte, which ranges from 1.32 to 1.37. According to these results, the proposed biosensor emerges as an exemplary candidate for applications in medical and chemical assays, as well as various assessments reliant on the RI of different analytes.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7081 - 7088"},"PeriodicalIF":4.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090353","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":"Plasmonic Sensor with BaTiO3 and Si Layers for Dual Application in Environmental Monitoring","authors":"Anupam Kushwaha,&nbsp;Akanksha Mishra,&nbsp;Roli Verma","doi":"10.1007/s11468-024-02750-2","DOIUrl":"10.1007/s11468-024-02750-2","url":null,"abstract":"<div><p>The need of environmental monitoring with the advancement and climate emergency is vital for the survival. The use of preservatives, fertilizers, cooling substances, etc., either in aqueous or in gaseous form has been increased in daily life. Therefore, it is important to develop a sensor which can sense both to monitor these. The present study provides a theoretical approach to achieve refractive index sensing based surface plasmon resonance sensor to monitor gaseous and aqueous impurities with a single probe. Use of fiber optic-based SPR sensor provides remote sensing, compact design, and real time monitoring, etc. The proposed sensor is optimized to sense both aqueous and gaseous analyte medium. The use of BaTiO₃ and Si layer provides multi-fold improvement in sensitivity in NIR region. For proposed sensor, we have achieved ultrahigh sensitivity and good figure of merit for aqueous medium ranging from RI 1.33 to 1.37 and high sensitivity with linear performance for gaseous medium. For gaseous analyte, the sensor is working for ultralow concentration ranges up to RI 1.01. Hence, the proposed sensor will be beneficial for both the aqueous and gaseous impurity monitoring in NIR region where it shows linear performance throughout the range of gaseous refractive indices analyte.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7089 - 7100"},"PeriodicalIF":4.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090354","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":"Designing Hybrid Plasmonic Nanolasers with High Quality Factors","authors":"Nazila Khosravi,&nbsp;Hassan Pakarzadeh","doi":"10.1007/s11468-024-02658-x","DOIUrl":"10.1007/s11468-024-02658-x","url":null,"abstract":"<div><p>The miniaturization of optical devices with the advancement of micro/nano technology has led to the development of many research fields and various practical applications. Plasmonic nanolasers have attracted a lot of attention due to their ability to confine light in dimensions below the diffraction limit as well as the significant reduction of semiconductor laser dimensions. However, plasmonic nanolasers have a low quality factor due to plasmonic losses, which limits the performance of plasmonic nanolasers. In this paper, a hybrid plasmonic nanolaser with a structure consisting of GaP gain material, silver metal, graphene layer, silica, and air gap is designed, and by choosing different gain materials such as InP, WS₂, MoS₂, and MoTe₂, the effective refractive index and quality (<i>Q</i>) factor are simulated. Also, the effect of air gap on the mentioned parameters is investigated. The results show that by choosing the WS₂ material for the hybrid plasmonic nanolaser and the air gap dimensions of 25 nm width and 10 nm length, the maximum <i>Q</i> factor of 328.7 is obtained which is higher than those reported in the literature.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7061 - 7068"},"PeriodicalIF":4.3,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090276","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":"Enhanced Magneto-Optical Kerr Effect-Based Multilayers/Pd for Hydrogen Magnetoplasmonic Transducers","authors":"Ali Abdulkhaleq Alwahib,&nbsp;Sura H. Al-rekabi","doi":"10.1007/s11468-024-02648-z","DOIUrl":"10.1007/s11468-024-02648-z","url":null,"abstract":"<div><p>We studied magneto-optical surface plasmon resonance (MOSPR) theoretically and experimentally to design a hydrogen gas sensor. A prism-based MOSPR design was used to test the sensor’s reflectance and perform related measurements. Results showed that the ferromagnetic materials Co, Fe, and Ni can improve the sensor’s gas-sensing performance. In addition, the MOSPR of Au or Ag base-ferromagnetic material coated with 1, 2, or 3 nm-thick Pd layers was studied in air and hydrogen environments. A thick Pd layer increases response time in contrast to a thin Pd layer. Moreover, ferromagnetic materials considerably affect theta shift hydrogen sensing, reaching a maximum Kerr effect of &gt; 1.5. Among ferromagnetic materials, Fe exhibits the best performance. Its reflectance at air and hydrogen resonance angles are 0.013089 and 0.0083943, respectively. The maximum angle shift between hydrogen gas and Fe ferromagnetic materials’ air is 0.294° when the Pd layer is 3 nm thick. This finding suggests that the sensitivity of a hydrogen gas sensor can be improved by defining the theta shift based on a specific ferromagnetic material and Pd thickness.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 8","pages":"5667 - 5677"},"PeriodicalIF":4.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923168","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":"Detection of COVID-19 Using Surface Plasmon Resonance Sensor for Sensitivity Enhancement: Theoretical Analysis","authors":"Rajeev Kumar,&nbsp;Shivam Singh,&nbsp;Hiba Bouandas,&nbsp;Javed Alam","doi":"10.1007/s11468-025-02762-6","DOIUrl":"10.1007/s11468-025-02762-6","url":null,"abstract":"<div><p>This paper demonstrated a wavelength interrogation–based surface plasmon resonance (SPR) sensor proposed for detecting coronavirus. The proposed design incorporates a BAF10 prism, silver (Ag), and black phosphorus (BP) to detect several ligand-analyte pairs associated with the virus. This biosensor is capable of efficiently detecting human monoclonal antibody immunoglobulin G (IgG), mutant viral single-stranded ribonucleic acid (RNA), and SARS-CoV-2 spike receptor-binding domain (RBD). The wavelength sensitivity (WS) and limit of detection (LoD) of the SPR sensor are calculated for each analyte in order to assess its performance. The sensor achieves a maximum WS of 5350.87 nm/RIU for RNA detection, 5333.33 nm/RIU for spike RBD glycoprotein detection, and 4700.85 nm/RIU for IgG quantification. These results are based on a finite element method (FEM) numerical analysis. Furthermore, the proposed sensor’s LoD is calculated as 1.86 × 10⁻⁶ RIU for RNA, 2.14 × 10⁻⁶ RIU for spike RBD glycoprotein, and 2.12 × 10⁻⁶ RIU for IgG. The penetration depth (PD) of the sensor is found to be 218.07 nm. These findings suggest that the proposed SPR sensor could be an effective and rapid tool for point-of-care testing for COVID-19.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7049 - 7059"},"PeriodicalIF":4.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090672","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":"Effect of Thermal Annealing on Surface Plasmon Resonance in Tin Oxide Thin Films","authors":"Kamal Kayed","doi":"10.1007/s11468-025-02761-7","DOIUrl":"10.1007/s11468-025-02761-7","url":null,"abstract":"<div><p>In this work, thin films of tin oxide were synthesized by vaporizing tin oxide powder targets using a continuous CO₂ laser of specific power and then deposition of the resulting vapor on glass substrates. Two films were synthesized, one of which was annealed at 550 °C for 2 h. The effect of thermal annealing on the structural and optical properties of the prepared films was investigated. The obtained results showed that thermal annealing causes changes in crystallite size related to the orientations of the crystal planes. Moreover, the appearance of the plasmon resonance peak of tin oxide particles was observed in the absorption spectrum of the as-deposited sample at 305.88 nm. This peak becomes broader and moves to 336.87 nm in the spectrum of the annealed sample.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"20 9","pages":"7011 - 7015"},"PeriodicalIF":4.3,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090583","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}