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[IEEE 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - Zatoka, Ukraine (2018.9.9-2018.9.14)] 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - The Problem of Optimal Plasmonic Nanostructures Choice for SERS Applications
摘要： Nanostructures research plays a crucial role in the transformation of breakthrough scientific ideas into next-generation technology. In the way that silicon revolutionized the microelectronics industry, plasmonic nanostructures can greatly impact on the field of analytical instruments for molecular analysis of materials, even biological objects. Currently, research in the plasmonics has been faced the problem of choosing the optimal plasmonic nanostructures in order to realize useful devices. Usually, metal components such as gold, silver and copper serve for working elements of plasmon-active surfaces, which have a number of advantages in comparison with other materials. However, on the stage of devises design, the choice even between three different metals causes great difficulties. In order to take the first steps to solve this problem, here we consider the criteria for plasmon-active metals choice, and also give examples of Au, Ag, and Cu nanostructures obtained by the controlled self-assembly in limited pore volume of the SiO2/Si template for SERS applications.
关键词： SERS,Ag,template synthesis,Au,plasmonic nanostructures,Cu,ion track technology
更新于2025-09-12 10:27:22
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[IEEE 2019 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Udine, Italy (2019.9.4-2019.9.6)] 2019 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Numerical simulations of nanosecond laser annealing of Si nanoparticles for plasmonic structures
摘要： This paper reports numerical simulations of nanosecond laser thermal annealing of plasmonic structures based on Si-nanoparticles embedded in a SiO2 matrix. From these simulations, we extracted guidelines for the structure design to be adopted. This study also investigates the expected laser annealing process window and the influence of nanoparticles coverage.
关键词： plasmonic nanostructures,melt,Si nanoparticles,Laser annealing
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Tailoring Second-Harmonic Generation in Plasmonic Radial Trimers using Cylindrical Vector Beams
摘要： Collective effects in assemblies of plasmonic nanostructures are attracting widespread interest. Such effects are governed by the interactions among the constituents of the overall structure, providing an alternative path to modify plasmon resonances [1]. A particularly interesting collective effect in these structures is the so-called dark plasmon mode, which has a net zero dipole moment and cannot be accessed using plane waves or linearly polarized light under normal incidence. An emerging way to excite collective dark modes in such structures is through the use of cylindrical vector beams (CVB) that exhibit inhomogeneous states of polarization such as azimuthal or radial polarizations [2,3]. The use of CVBs to excite collective nonlinear optical effects such as second-harmonic generation (SHG) in oligomers has started only recently [4]. Here, we demonstrate a similar possibility by tailoring SHG in plasmonic radial trimers using CVBs.
关键词： dark plasmon mode,second-harmonic generation,cylindrical vector beams,plasmonic nanostructures
更新于2025-09-12 10:27:22
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A Review: Evolution and Diversity of Optical Fibre Plasmonic Sensors
摘要： The purpose of this review is to bring to the attention of the wider research community how two quite different optical sensory techniques were integrated resulting in a sensor device of exceptional sensitivity with wide ranging capability. Both authors have collaborated over a 20 year period, each researching initially surface plasmon resonance (SPR) and optical fibre Bragg grating devices. Our individual research, funded in part by EPSRC and industry into these two areas, converged, resulting in a device that combined the ultra-sensitive working platform of SPR behavior with that of fibre Bragg grating development, which provided a simple method for SPR excitation. During this period, they developed a new approach to the fabrication of nano-structured metal coatings for plasmonic devices and demonstrated on fibre optic platform, which has created an ultra-sensitive optical sensing platform. Both authors believe that the convergence of these two areas will create opportunities in detection and sensing yet to be realised. Furthermore, giving the reader “sign-post” research articles to help to construct models to design sensors and to understand their experimental results.
关键词： gratings,optical fiber sensors,bio-sensors,plasmonic nanostructures
更新于2025-09-12 10:27:22
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Analyte transport to micro- and nano-plasmonic structures
摘要： The study of optical affinity biosensors based on plasmonic nanostructures has received significant attention in recent years. The sensing surfaces of these biosensors have complex architectures, often composed of localized regions of high sensitivity (electromagnetic hot spots) dispersed along a dielectric substrate having little to no sensitivity. Under conditions such that the sensitive regions are selectively functionalized and the remaining regions passivated, the rate of analyte capture (and thus the sensing performance) will have a strong dependence on the nanoplasmonic architecture. Outside of a few recent studies, there has been little discussion on how changes to a nanoplasmonic architecture will affect the rate of analyte transport. We recently proposed an analytical model to predict transport to such complex architectures; however, those results were based on numerical simulation and to date, have only been partially verified. In this study we measure the characteristics of analyte transport across a wide range of plasmonic structures, varying both in the composition of their base plasmonic element (microwires, nanodisks, and nanorods) and the packing density of such elements. We functionalized each structure with nucleic acid-based bioreceptors, where for each structure we used analyte/receptor sequences as to maintain a Damk?hler number close to unity. This method allows to extract both kinetic (in the form of association and dissociation constants) and analyte transport parameters (in the form of a mass transfer coefficient) from sensorgrams taken from each substrate. We show that, despite having large differences in optical characteristics, measured rates of analyte transport for all plasmonic structures match very well to predictions using our previously proposed model. These results highlight that, along with optical characteristics, analyte transport plays a large role in the overall sensing performance of a nanoplasmonic biosensor.
关键词： mass transfer coefficient,analyte transport,plasmonic nanostructures,nanoplasmonic architecture,optical affinity biosensors
更新于2025-09-12 10:27:22
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DNA Enabled Chiral Gold Nanoparticle - Chromophore Hybrid Structure with Resonant Plasmon – Exciton Coupling Gives Unusual and Strong Circular Dichroism
摘要： Circular dichroism (CD) from hybrid complexes of plasmonic nanostructures and chiral molecules has recently attracted significant interest. However, the hierarchical chiral self-assembly of molecules on surfaces of metal nanostructures has remained challenging. As a result, a deep understanding of plasmon-exciton coupling between surface plasmons and chiral collective molecular excitations has not been achieved. In particular, the critical impact of resonant plasmon-exciton coupling within the hybrid is unclear. Here, we employed DNA-templated strategies to control the chiral self-assembly of achiral chromophores with rationally tuned exciton transitions on gold nanosphere (AuNP) or gold nanorod (AuNR) surfaces. Unlike many previous chiral plasmonic hybrids utilizing chiral biomolecules with CD signals in the UV range, we designed structure with the chiral excitonic resonances at visible wavelengths. The constructed hybrid complexes displayed strong chiroptical activity that depends on the spectral overlap between the chiral collective molecular excitations and the plasmon resonances. We find that when spectral overlap is optimized, the molecular CD signal originating from the chiral self-assemblies of chromophores was strongly enhanced (maximum enhancement of nearly an order of magnitude) and a plasmonic CD signal was induced. Surprisingly, the sign of the molecular CD was reversed despite different self-assembly mechanisms of the Au nanoparticle-chromophore hybrids. Our results provide new insight into plasmonic CD enhancements and will inspire further studies on chiral light-matter interactions in strongly coupled plasmonic-excitonic systems.
关键词： DNA-templated strategies,gold nanorod,chiral molecules,chiroptical activity,gold nanosphere,Circular dichroism,plasmonic nanostructures
更新于2025-09-12 10:27:22
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Self-organized spatially separated silver 3D dendrites as efficient plasmonic nanostructures for surface-enhanced Raman spectroscopy applications
摘要： Surface-enhanced Raman spectroscopy (SERS) is a promising optical method for analyzing molecular samples of various nature. Most SERS studies are of an applied nature, indicating a serious potential for their application in analytical practice. Dendritelike nanostructures have great potential for SERS, but the lack of a method for their predictable production significantly limits their implementation. In this paper, a method for controllably obtaining spatially separated, self-organized, and highly-branched silver dendrites via template synthesis in pores of SiO2/Si is proposed. The dendritic branches have nanoscale roughness, creating many plasmon-active “hotspots” required for SERS. The first held 3D modeling of the external electromagnetic wave interaction with such a dendrite, as well as experimental data, confirms this theory. Using the example of a reference biological analyte, which is usually used as a label for other biological molecules, the dendrites’ SERS-sensitivity up to 10?15M was demonstrated with an enhancement factor of 108. The comparison of simulation results with SERS experiments allows distinguishing the presence of electromagnetic and chemical contributions, which have a different effect at various analyte concentrations.
关键词： SERS,plasmonic nanostructures,silver dendrites,hotspots,Surface-enhanced Raman spectroscopy
更新于2025-09-12 10:27:22
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On-Demand Electromagnetic Hotspot Generation in Surface Enhanced Raman Scattering Substrates via “Add-On” Plasmonic Patch
摘要： Electromagnetic hotspots at the interstices of plasmonic assemblies are recognized to be the most potent sites for surface enhanced Raman scattering (SERS). We demonstrate a novel “add-on” electromagnetic hotspot formation technique, which significantly improves the sensitivity of conventional SERS substrates comprised of individual plasmonic nanostructures. The novel approach demonstrated here involves the transfer of “plasmonic patch”, a transparent, flexible and conformal elastomeric film adsorbed with plasmonic nanostructures, onto a conventional SERS substrate. The addition of plasmonic patch onto conventional SERS substrate following the analyte capture results in the formation of electromagnetic hotspots and hence large SERS enhancement. The application of plasmonic patch improves the sensitivity and limit of detection of conventional SERS substrates by upto ~100-fold. The transfer of plasmonic patch also effectively transforms the SERS-inactive gold mirror to a highly SERS-active “particle-on-mirror” system. Furthermore, we demonstrate that the “add-on” technique can be effectively utilized for the vapor phase detection of explosives such as trinitrotoluene (TNT) using peptide recognition elements. We believe that the on-demand hotspot formation approach presented here represents a highly versatile and ubiquitously applicable technology readily expandable to any existing SERS substrate without employing complicated modification.
关键词： Trinitrotoluene (TNT),On-Demand Electromagnetic Hotspots,Surface Enhanced Raman Scattering (SERS),Plasmonic Patch,Plasmonic Nanostructures
更新于2025-09-11 14:15:04
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Green synthesized plasmonic nanostructure decorated TiO2 nanofibers for photoelectrochemical hydrogen production
摘要： We herein present the Au and Ag NPs synthesized via chemical reduction with green synthesized carbon nanolights (CNL) as a visible light photosensitizer for TiO2 nanofibers (TNFs) towards photoelectrochemical water splitting. The synthesized photoanodes (PA1: TNFs, PA2: Ag@CNLs/TNFs and PA3: Au@CNLs/TNFs) were probed ex-situ for morphological, structural, optical and electronic properties before being used for the PEC experiments. We first show the efficient photocatalytic activity of these photoanodes for the degradation of methylene blue under visible light irradiation. Followed by the photoelectrochemical (PEC) water splitting investigation, which reveals the substantially improved photocurrent density to 13 mA/cm2 and 18 mA/cm2, for PA2 and PA3, respectively under simulated AM 1.5 solar illumination at 1.36 V vs RHE, ~15 fold enhancement compared to that obtained for a PA1. This improvement we attributed to the synergic consequence, improved absorption and effective charge carrier separation & transport due to surface plasmonic effect, which is well evident in the decrease of measured charge transfer resistance (Rct), for PA2 (15.1 Ω) and PA3 (6.71 Ω), as compared to PA1 (139 Ω).
关键词： TiO2 nanofibers,Green synthesis,Hydrogen,Photo-electrochemical,Carbon quantum dots,Plasmonic nanostructures
更新于2025-09-11 14:15:04
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Performance improvement of thin-film silicon solar cells using transversal and longitudinal titanium nitride plasmonic nanogratings
摘要： Taking advantage of plasmonic nanostructures for light trapping in thin-film silicon solar cells has attracted ample attention among researchers. Titanium nitride (TiN) has recently been introduced as a promising material exhibiting plasmonic properties similar to gold while taking advantage of low cost, low loss, and CMOS compatibility. Moreover, utilization of TiN offers a good tunability since the optical properties of TiN depend on many fabrication parameters. In this work, transversal and longitudinal TiN nanograting arrays have been employed to act like perpendicular polarizers trapping the incident light in the active layer of the cell. Using optical and electrical simulations, it has been shown that the design provides a significant enhancement in the performance of thin-film silicon solar cells owing to the excitation of surface plasmon resonances and their resultant light trapping. Thanks to the employment of TiN nanogratings, the device offers a broadband absorption enhancement with a considerable improvement at the near infrared wavelengths in which the absorption of bare silicon layer is weak. The proposed thin-film cell results in short-circuit current and power conversion efficiency of about 26.46 mA/cm2 and 12.27%, respectively proving the proficiency of the design for performance improvement of thin-film photovoltaic systems.
关键词： Titanium nitride (TiN),Light trapping,Thin-film silicon solar cells,Plasmonic nanostructures
更新于2025-09-11 14:15:04