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[IEEE 2018 IEEE International Ultrasonics Symposium (IUS) - Kobe, Japan (2018.10.22-2018.10.25)] 2018 IEEE International Ultrasonics Symposium (IUS) - Fast SAW Device Simulation in COMSOL Using the Hierarchical Cascading Method
摘要： Using the hierarchical cascading method for modeling semiconductor devices makes it possible to achieve high accuracy by considering the influence of the details of the structure of the device. In this paper, we consider the simulation of a quantum cascade laser (QCL) with a periodic structure. The simulation is performed using the finite element method (FEM) in the COMSOL Multiphysics software. The results show that the proposed method allows to obtain the characteristics of the device with high accuracy.
关键词： finite element method,quantum cascade laser,COMSOL Multiphysics,simulation
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Intelligent and Advanced System (ICIAS) - Kuala Lumpur, Malaysia (2018.8.13-2018.8.14)] 2018 International Conference on Intelligent and Advanced System (ICIAS) - Simulation of Interdigitated Electrodes (IDEs) Geometry Using COMSOL Multiphysics
摘要： Interdigitated Electrodes (IDEs) based sensor in comb-like electrodes structure is also an attractive candidate in gas sensor and biosensor applications, owing to its simple structural design. The sensitivity can be improved based on geometric parameters of the sensor. Hence, in this paper, we study the physical model of the IDEs-based sensor and concern with its geometrical parameters (gap sizes, number of fingers and width of fingers) based on the finite element simulations using COMSOL Multiphysics. The simulation results were used to show the electrical field that generated by the IDEs and compare to other to find the optimum design. Based on the results, the relationship between the geometric parameters and the IDEs performances are studied. The simulation results show that the higher electric fields are generated with the smaller gap size and smaller width of fingers. Besides that, the results show that the gap size and the width of fingers affect the IDEs performance significantly compared to the number of fingers. The IDE with the design 18 fingers, 0.1 mm gap size between fingers and 0.1 mm width of the finger is the optimum design which generates 30.6 kV/m average of electric field magnitude.
关键词： IDEs,COMSOL Multiphysics,geometry parameter
更新于2025-09-23 15:22:29
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LAO-NCS: Laser Assisted Spin Torque Nano Oscillator-Based Neuromorphic Computing System
摘要： Dealing with big data, especially the videos and images, is the biggest challenge of existing Von-Neumann machines while the human brain, benefiting from its massive parallel structure, is capable of processing the images and videos in a fraction of second. The most promising solution, which has been recently researched widely, is brain-inspired computers, so-called neuromorphic computing systems (NCS). The NCS overcomes the limitation of the word-at-a-time thinking of conventional computers benefiting from massive parallelism for data processing, similar to the brain. Recently, spintronic-based NCSs have shown the potential of implementation of low-power high-density NCSs, where neurons are implemented using magnetic tunnel junctions (MTJs) or spin torque nano-oscillators (STNOs) and memristors are used to mimic synaptic functionality. Although using STNOs as neuron requires lower energy in comparison to the MTJs, still there is a huge gap between the power consumption of spintronic-based NCSs and the brain due to high bias current needed for starting the oscillation with a detectable output power. In this manuscript, we propose a spintronic-based NCS (196 × 10) proof-of-concept where the power consumption of the NCS is reduced by assisting the STNO oscillation through a microwatt nanosecond laser pulse. The experimental results show the power consumption of the STNOs in the designed NCS is reduced by 55.3% by heating up the STNOs to 100?C. Moreover, the average power consumption of spintronic layer (STNOs and memristor array) is decreased by 54.9% at 100?C compared with room temperature. The total power consumption of the proposed laser assisted STNO-based NCS (LAO-NCS) at 100?C is improved by 40% in comparison to a typical STNO-based NCS at room temperature. Finally, the energy consumption of the LAO-NCA at 100?C is expected to reduce by 86% compared with a typical STNO-based NCS at the room temperature.
关键词： COMSOL multiphysics,power efficient,laser,spin torque nano-oscillators,neuromorphic computing system
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - On the sensitivity of optical fiber surface plasmon resonance based sensor for detection of dielectric analytes using COMSOL Multiphysics
摘要： Due to the importance of the public health toward the exposure to hazardous gases, real-time and sensitive gas sensors are among the priorities at present. Among different types of gas sensors, optical sensors with advantages like high sensitivity, low cost, miniaturization, and online monitoring have received great attention between the researchers. In this article, a fiber optic sensor based on surface plasmon resonance (SPR) of gold thin film is simulated by COMSOL Multiphysics. For this purpose, a single-mode optical fiber was considered to be uncladed on its middle part and coated with a thin film of gold and the sensitivity and resonance condition of the device was investigated as a function of thickness of the metal.
关键词： Optical Fiber,COMSOL Multiphysics,Gold,Sensor,Surface Plasmon
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Zhenjiang, China (2019.8.4-2019.8.8)] 2019 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Simulation of Local Laser Annealing of Amorphous TiNiCu Alloy to Create Nanostructured Functional Material
摘要： Present work considers simulation via Comsol Multiphysics software of local laser annealing of amorphous TiNiCu thin ribbon to create a layered nanostructured crystalline-amorphous functional material with the two-way shape memory effect, which is intended for manufacturing of the nanoactuator. Several simulations were performed with different parameters of laser radiation, such as pulse duration and power density. Laser treatment was simplified as a boundary heat source at sample surface.
关键词： liquid,crystalline state,laser treatment,nanotweezers,Comsol Multiphysics,amorphous,state,shape memory effect,quenching
更新于2025-09-16 10:30:52
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Simulations of the Near-Field Enhancement on AFM Tip Irradiated by Annular Laser Beam
摘要： The near-field enhancement underneath the AFM tip irradiated by a laser beam is widely utilized in various nanofabrication techniques, such as nano-welding, nano-manipulation, nano-etching and so on. In this paper, a numerical model of near-field enhancement on AFM tip irradiated by annular laser beam is established using COMSOL Multiphysics. The results show that when the AFM tip is irradiated by annular laser beam, strong near-field enhancement is induced at the apex of the tip. The field distribution curve with the substrate presents a saddle shape, which demonstrates that the annular beam irradiated the AFM tip produce an extremely high near-field enhancement between the particle and the tip. In addition, the results indicate that when the AFM tip is irradiated by the annular laser with higher frequency, the near-field enhancement underneath the apex of the tip increases correspondingly. Moreover, when the irradiation angle is 60 Deg and the irradiation distance is 65 nm, the near-field enhancement reaches the peak. Based on the numerical simulation of the near-field enhancement, the system of the AFM tip irradiated by annular laser beam can be anticipated for further application in the field of nanofabrication.
关键词： Near-field enhancement,nanofabrication,COMSOL Multiphysics simulation,annular laser beam
更新于2025-09-16 10:30:52
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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) - Effective Coupling of a Plasmonic Nanorod to a Microsphere Resonator
摘要： Coupled photonic-plasmonic systems have already proven successful as ultra-sensitive sensors with the potential of single virus detection. Such systems are e.g. composed of a plasmonic nanoparticle in vicinity of an optical resonator usually in the form of a microsphere, a mirroring or a microdisk. These systems are proven highly sensitive due to their large quality factor and are thus utilized as bio, pressure, gas or temperature sensors. When a plasmonic nanoparticle is positioned near such resonator, coupling of the plasmonic and photonic modes can result in an ultra-sensitive biosensor, since nanoparticle presence enhance ambient refractive index (RI) variation sensitivity. In this paper, photonic-plasmonic coupling of a gold nanorod in close vicinity of a silica microsphere is simulated in order to investigate various types of coupling settings in such systems. The presence of the nanorod results in a frequency shift as well as in a reduction of the quality factor, which are both highly dependent on nanorod properties such as size, distance between the particle and the sphere as well as the nanorod orientation relative to the sphere surface. A single gold nanorod is positioned in 50nm distance to a 15.5μm silica microsphere which supports a whispering gallery mode at 1550nm and both resonance frequency and quality factor are computed using the simulation platform COMSOL Multiphysics. The nanorod orientation is altered starting from the tangential direction with respect to the sphere surface (0o) to the perpendicular direction (90o). In the Fig 1a) the quality factor together with the damping constant is shown as a function of the nanorod orientation for at an operating wavelength of 1550nm. The 90o direction results in higher quality factor as well as a better mode stability although the frequency shift associated to a 90o turn is only about 10GHz. In Fig 1b) the frequency shift and quality factor for the perpendicular nanorod versus ambient medium RI is plotted, which confirms the ultra-sensitivity of the designed optical resonator up to a 10-3 RI shift. The electric field distribution outside and inside of the nanorod is illustrated in Fig. 1c) for the three directions 90o, 45o and 0o where the perpendicular nanorod shows the weakest interaction with the excited whispering gallery mode and thus yields the largest quality factor.
关键词： silica microsphere,photonic-plasmonic coupling,gold nanorod,COMSOL Multiphysics,whispering gallery mode
更新于2025-09-12 10:27:22
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A Novel Way for Improving the Overall Photoelectric Conversion Efficiency of Dye Sensitized TiO 2 Solar Cells
摘要： The past several years has witnessed a sharp increase in the number of scientists and researchers who have attached great importance to studying Dye sensitized solar cells (DSSCs) because of its low cost and potential high photoelectric conversion efficiency. There are two main factors that influence the photoelectric conversion efficiency of dye sensitized solar cells. One is the low photon absorption rate of solar cells, and other one is the low transmission rate of the photo-generated electrons through the thick nanocrystalline film. So in order to further research and improve efficiency, an accurate model using COMSOL Multiphysics is investigated to reveal the photoresponse and current transport processes of DSSC. Specifically, an optical model is studied to determine how much the solar energy each cell takes in, and an electrical model is investigated to determine how much the overall efficiency. Besides, three adjusted micro/nanostructures of DSSCs have been built for improving the efficiency. The study shows that a more suitable structure can collect more solar energy and improve the electronic diffusion efficiency so as to improve the overall photoelectric conversion efficiency of DSSC.
关键词： Dye sensitized solar cells (DSSCs),COMSOL Multiphysics,Photoelectric coupling simulation,Micro/nanostructure
更新于2025-09-12 10:27:22
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Tensile control of the thermal flow in plasmonic heaters realized on flexible substrates
摘要： In this paper, we present a simple and robust numerical method capable of predicting, with high accuracy, the thermal effects occurring for different gold nanoparticle arrangements under externally applied strain. The physical system is numerically implemented in the COMSOL Multiphysics simulation platform. The photothermal response of different arrangements of gold nanoparticles, resonantly excited by linearly polarized light, is considered with the system at rest and under the action of mechanical stress. The generation of heat at the nanoscale is analyzed by considering how this is affected by the variation of the extinction cross section. We describe the peculiar conditions under which mechanically controlled gold nanoparticle arrangements can significantly increase the local temperature due to the formation of localized photothermal hot spots. The resulting systems are envisioned in applications as optomechanically tunable plasmonic heaters.
关键词： COMSOL Multiphysics,photothermal effects,mechanical stress,plasmonic heaters,gold nanoparticles
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Numerical simulation of an ozone-based wet-chemical etching
摘要： In the PV-industry, wet-chemical baths are used for surface structuring, conditioning and cleaning. Besides cleaning the wafers, ozone-based wet-chemical cleaning processes show the ancillary effect of intendedly etching back the emitter and/or rounding of textured surfaces. To simulate and predict this rounding of micro-pyramids during the cleaning process, a two dimensional process simulation model was built. With the finite element method of COMSOL Multiphysics the diffusion and convection based mass transport of ozone along the pyramids is described. Important parameters for the evaluation, obtained from experimental results, are the etch rate and resulting roundness (R) of the micro-pyramids tips. A parametric study was carried out with the purpose of adjusting the model. The simulation represents the experimental data accurately, e.g. after 2 min exposure time R = 67 nm for the experimental and R = 66 nm for the simulation data.
关键词： PV-industry,numerical simulation,micro-pyramids,ozone-based wet-chemical etching,COMSOL Multiphysics
更新于2025-09-11 14:15:04