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Improving the performance of nanostructure multifunctional graphene plasmonic logic gates utilizing coupled-mode theory
摘要： Nanostructure ring resonators are suitable devices for photonic integrated circuits. A nano-scale multifunctional logic device based on plasmon-induced transparency (PIT) is presented here. This device consists of a pair of hexagonal ring resonators coupled with two parallel metal–insulator–metal (MIM) waveguides. According to the coupled-mode theory, the appropriate detuning between the resonances wavelengths of two resonators acts as the key factor to achieve the PIT phenomenon. For this purpose, the PIT phenomenon for several metals utilized in MIM waveguides is studied. Also, graphene has been employed as the replacement for the metal under the hexagonal ring resonator and its parallel waveguides. However, the interaction of light with graphene as a 2D material is weak, by varying the dimensions of waveguides, rings, and their distances, and also, incident light wavelength and graphene chemical potential, we have achieved the desired couplings in the structure. Finite-difference-time-domain (FDTD) simulations confirm that “1” and “0” logic states which represent the high and low levels of the optical power can be achieved at the through and drop ports by changing the refractive index. It has been demonstrated that the proposed structure implements the function of logical operations including XOR and XNOR, simultaneously.
关键词： Logical operations,Nanostructure ring resonators,Plasmon-induced transparency,Finite-difference-time-domain,Graphene,Metal–insulator–metal waveguides
更新于2025-09-11 14:15:04
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Self-Catalytic-Grown SnOx Nanocones for Light Outcoupling Enhancement in Organic Light-Emitting Diodes
摘要： Light extraction in organic light-emitting diodes (OLEDs) was improved by applying SnOx nanocones grown via thermal annealing in a low-O2 atmosphere. SnOx was easily fabricated through thermal processing after Sn deposition. The diameter of the SnOx nanocones was controlled by changing the deposition thickness of Sn. The SnOx nanocones induced strong Mie scattering, which reduced the total internal reflection in the glass substrate. Consequently, the OLED with SnOx nanocones exhibited a 23% increase in the external quantum efficiency compared with a reference device.
关键词： Mie scattering,SnOx nanostructure,light extraction,organic light-emitting diodes (OLEDs),FDTD simulation
更新于2025-09-11 14:15:04
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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) - Theoretical Model of the Processes of Nanostructuring the Material Surface under the Influence of Laser Radiation
摘要： The transition between different structural states of a surface of a solid after influence of laser radiation can be presented by the self-consistent behavior of three parameters: the relaxation field, the fields of stress and the concentration of relaxation zones. Within the framework of the Lorentz system, the transition between stable states of formations on the surface of a solid was presented. The dependence of the stationary value of the order parameter, at which the formation of relaxation zones is possible, was obtained. The intermittent version of the formation of relaxation zones was examined using the mechanism of first order phase transition.
关键词： phase transition,nanostructure,residual deformation,relaxation parameter
更新于2025-09-11 14:15:04
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Nanostructured GaN sensors for Surface Enhanced Raman Spectroscopy
摘要： The aim of this communication is to describe the range of applications of GaN-based platforms for trace detection and identification of biological and chemical agents using SERS technique. The methods of nano-structuring of GaN surface for SERS application are briefly described. The results of employing SERS method for analysis of Fentanyl and Bacillus Atrophaeus spores is demonstrated. The arguments are summarized which show the universal feature of GaN-based platforms as SERS sensor.
关键词： SERS,GaN,Hot-spots,Nanostructure
更新于2025-09-11 14:15:04
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Resistive Switching in Sub-micrometric ZnO polycristalline Films
摘要： Resistive switching devices are considered as the most promising alternative to conventional random access memories. They interestingly offer effective properties in terms of device scalability, low power-consumption, high read/write operation time, endurance and state retention. Moreover, neuromorphic circuits and synapse-like devices are envisaged with resistive switching modeled as memristors, opening the route toward beyond-Von Neumann computing architectures and intelligent systems. This work investigates how the resistive switching properties of zinc oxide thin films are related to both sputtering deposition process and device configuration, i.e. valence change memory (VCM) and electrochemical metallization memory (ECM). Different devices, with an oxide thickness ranging from 50 to 250 nm, are fabricated and deeply characterized. The electrical characterization evidences that, differently from typical nanoscale amorphous oxides employed for resistive RAMs (HfOx, WOx, etc..), sub-micrometric thicknesses of polycristalline ZnO layers with ECM configuration are needed to achieve the most reliable devices. The obtained results are deeply discussed, correlating the resistive switching mechanism to material nanostructure.
关键词： resistive switching,ZnO,nanostructure,memristors
更新于2025-09-10 09:29:36
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Scaling Phononic Quantum Networks of Solid-State Spins with Closed Mechanical Subsystems
摘要： Phononic quantum networks feature distinct advantages over photonic networks for on-chip quantum communications, providing a promising platform for developing quantum computers with robust solid-state spin qubits. Large mechanical networks including one-dimensional chains of trapped ions, however, have inherent and well-known scaling problems. In addition, chiral phononic processes, which are necessary for conventional phononic quantum networks, are difficult to implement in a solid-state system. To overcome these seemingly unsolvable obstacles, we have developed a new network architecture that breaks a large mechanical network into small and closed mechanical subsystems. This architecture is implemented in a diamond phononic nanostructure featuring alternating phononic crystal waveguides with specially designed band gaps. The implementation also includes nanomechanical resonators coupled to color centers through phonon-assisted transitions as well as quantum state transfer protocols that can be robust against the thermal environment.
关键词： quantum communications,diamond phononic nanostructure,Phononic quantum networks,quantum state transfer,solid-state spin qubits
更新于2025-09-10 09:29:36
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Hydrogenated amorphous carbon films with different nanostructure: a comparative study
摘要： The introduction of curved graphite fragments into hydrogenated amorphous carbon films has been studied, and their contents are always estimated by TEM and Raman. Here, we detailedly discussed the advantage and disadvantage of TEM and Raman fit method. Combined with FTIR results, we claified the chemical structures of the structural films and the bonded sites of doped H. The curved graphite structures included hexahydric carbon rings, and amorphous carbon (a-C) structures had rich olefinic groups and H. Finally, the differences among TEM, Raman, FTIR and H analysis in terms of the contents of curved graphite fragments were discussed.
关键词： FTIR,nanostructure,Raman,a-C:H,hydrogenated amorphous carbon film
更新于2025-09-10 09:29:36
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One-step synthesis of nail-like Mn-doped CdS/CdBr<sub>2</sub> hetero-nanostructures for potential lasing application
摘要： Nanoscale heterostructures, which incorporate two or more materials such as core-shell nanocrystals, core-crown nanoplates, or seeded nanorods, allow better control of the optical, electrical and magnetic properties that are inaccessible in single component nanostructure, yet their variety and controlled growth are still challenging. Here, a nail-like Mn-doped CdS/CdBr2 hetero-nanostructure, which has a hexagonal plate on top of a nanowire, is firstly fabricated by a simple one-step thermal evaporation process. According to the characterization results, its growth mechanism could be obtained, in which the manganese bromide precursor plays a critical role in the formation of such nail morphology. The amplified spontaneous emission of the “nanonail” is achieved at a low threshold at room-temperature, which come from the local and dense exciton scattering due to their interactions excited by fs pulse. These interesting nail-like heterostructures may provide promising templates for constructing high-performance optoelectronic devices.
关键词： lasing,nail-like,hetero-nanostructure,photoluminescence,doping
更新于2025-09-10 09:29:36
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Fast sensing of imidacloprid residue in tea using surface-enhanced Raman scattering by comparative multivariate calibration
摘要： This study focused on the fabrication of a rapid, highly sensitive and inexpensive technique for the quantification of imidacloprid residue in green tea, based on surface-enhanced Raman scattering (SERS) using highly roughed surface flower shaped silver nanostructure (as SERS substrate) coupled with the chemometric algorithm. The basic principle of this method is imidacloprid yielded SERS signal after adsorption on Ag-NF under laser excitation by the electromagnetic enhancement and the intensity of the peak is proportional to the concentration ranging from 1.0×103 to 1.0×10-4 μg/mL. Among the models used, the GA-PLS (Genetic algorithm-partial least square) exhibited superiority to quantify imidacloprid residue in green tea. The model achieved Rp (correlation coefficient) of 0.9702 with RPD of 4.95 % in the test set and RSD for precision recorded up to 4.50 %. Therefore, the proposed sensor could be employed to quantify imidacloprid residue in green tea for the safeguarding of quality and human health.
关键词： Different PLS algorithm,Green tea,Flower-shaped silver nanostructure,Surface-enhanced Raman scattering,Imidacloprid residue
更新于2025-09-10 09:29:36
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Formation of enhanced opposite one-handed chiral fields in heterodimer-film nanostructures
摘要： Plasmonic chirality has attracted a lot of interests because it could result in dramatically increased chiroptical interactions and offer many potential applications in chiral molecules analysis, catalysis, and other nanotechnology. In particular, one-handed chiral field is required in many applications for the reason that molecules are generally distributed randomly in some region of structures. In this work, benefiting from the coupling effect and energy focusing effect, we propose a heterodimer-film nanostructure to achieve one-handed chiral fields under linearly polarized light illumination. The results indicate that there are just opposite one-handed chiral fields in different gaps of the heterodimer-film nanostructure. The volume averaged optical chirality in the gaps can reach 102 and the optical chirality of hot spots can reach 103, which has potential applications in chiral sensing and Raman optical activity.
关键词： heterodimer-film nanostructure,Raman optical activity,one-handed chiral fields,chiral sensing,Plasmonic chirality,optical chirality enhancement
更新于2025-09-10 09:29:36