Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Direct and Indirect Coupling Mechanisms in a Chiral Plasmonic System

Zhongyue Zhang [1], Yuyan Chen [1],
[1] School of Physics and Information Technology, Shaanxi Normal University, Xi’an, China

手性等离激元纳米结构被广泛研究并用于生物监测、分析化学和负折射率介质方面。在该结构中直接耦合的机制已经在相关研究中被发现。我们提出由金膜分隔两个金纳米棒(TNMF)的结构(图1),并发现了间接耦合机制。 在 COMSOL Multiphysics® 中,射频电磁波,频域接口用于求解正弦时变电磁场分布,选此接口计算 TNMF 结构的光学响应。插值函数用来设置金的折射率;设置边界条件模拟周期性结构阵列。结果可通过端口2对端口1的响应获得,并可查看每个数据点的电场、电荷等分布。应用程序库中射频模块的“Plasmonic wire grating”教程是初始指导我们计算纳米结构的例子。 用软件模拟圆偏振光照射,得到透射曲线和圆二色性(CD)曲线(图2)。加入金膜的结构产生新模式2。通过 B-K 模型分析电荷分布(图3),发现模式1是直接耦合,模式2是间接耦合。对间接耦合模式,上 ...

生物颗粒光声功率谱的有限元数值模拟研究

李勇 [1], 方晖 [2],
[1] 晋中学院,太原,中国
[2] 深圳大学,深圳,中国

定量分析生物颗粒形态的变化可以为疾病诊断提供依据。例如血红细胞形态的变化常常会伴随有相应的血液疾病[1],细胞的癌变常常伴随有细胞核形态的变化[2]等等。无标记的光学显微成像技术已经可以对生物颗粒的尺度和形状进行直接测量。光声显微成像技术(PAM)利用生物颗粒固有的吸光本领,已经可以对单个生物颗粒(如细胞和细胞器)进行成像[3]。 最近,光声流式仪(the photoacoustic flow-cytometry)已经实现了对单个生物颗粒进行连续检测[4]。然而,为了在大量的生物颗粒中快速检测生物颗粒的形貌,最好的方法是并非对其进行直接成像,而是采用高频光声显微技术[5],它的分辨率来源于实际测量与光声功率谱的分析。 光声功率谱分析需要通过计算建模来获取。我们使用 COMSOL Multiphysics® 有限元分析软件的声学模块用来建模 MFC7 细胞核的光声功率谱 ...

Calculating and Observing Opto-Mechanically Induced Surface Acoustic Waves in a Silica Whispering Gallery Microresonator

J. Zehnpfennig
Photonics Research Center
United States Military Academy
West Point, NY

Here we calculate opto-mechanically induced Surface Acoustic Waves upon a silica microresonator using COMSOL. Using conservation of momentum, we show both analytically and numerically that the photonphonon interaction within the resonator cavity causes a moving train of electrodes - a virtual grating of matter density – that displace material in different directions and magnitudes. This hyper ...

Improving Detection Sensitivity for Nanoscale Targets Through Combined Photonic and Plasmonic Techniques

G. Zhang[1], Y. Zhao[1]
[1]Clemson University, Clemson, SC, USA

Photonic technique such as the whispering gallery mode (WGM) is often used for detection of small particles like bacteria and viruses. It offers good detection sensitivity and is advantageous over other detection techniques because the detection can be label free. However, the detection sensitivity may not be sufficient when the size of the detection target is in nanoscale. To change this, we ...

Optimizing the Fluorescence of Diamond Color Centers Encapsulated into Core-Shell Nano-Resonators

M. Csete [1], L. Z. Szabó [1], A. Szenes [1], B. Bánhelyi [2], T. Csendes [2], G. Szabó [1]
[1] Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
[2] Institute of Informatics, University of Szeged, Szeged, Hungary

INTRODUCTION Enhancement of a single-photon emission is a great demand in recent science and applications, including development novel class of light sources, encoded information transfer and biological imaging [1, 2, 3]. Fluorescence can be improved through excitation and emission enhancement. Improvement of these two processes can be realized by using the near-field enhancement accompanying ...

Drift-Diffusion and Ballistic Transport Modeling in III-Nitride Multiple-QW Light Emitting Structures

M.V. Kisin, and H.S. El-Ghoroury
Ostendo Technologies Inc., Carlsbad, CA, USA

COMSOL-based modeling software developed at Ostendo Technologies allows detailed simulation of semiconductor lasers and light-emitting diodes. In this work, we study the inhomogeneity of the carrier injection into optically active quantum wells of polar and nonpolar III-nitride light emitters. Despite the absence of polarization-induced potential barriers, the nonpolar multiple-quantum well ...

Simulation of Bio-medical Waveguide in Mechanical and Optical fields - new

Y. Xin[1], A. Purniawan[1], L. Pakula[1], G. Pandraud[1], P. J. French[1]
[1]Technology University of Delft, Delft, Netherlands

This paper presents a freestanding waveguide to achieve the goal of detecting anastomosis leakage after colon surgery. The freestanding part is a thin membrane consisting of TiO2 rib and SiN ridge. This freestanding waveguide is designed both mechanically and optically to maintain mechanical stability during fabrication and detection process, and at the same time guarantee the detection ...

Simulation of Reverse Saturable Absorption

N. Bambha [1],
[1] U.S. Army Research Laboratory, Hillandale, MD, USA

This poster describes a simulation of reverse saturable absorption in a solution C_60 molecules using the COMSOL Multiphysics® software. The optical processes in C_60 can be modeled through a five-level system. The energy states include three levels of the singlet state, coupled to two levels of an excited triplet state. The optical process is modeled with simple rate equations coupled to a ...

Thermal Corrective Devices for Advanced Gravitational Wave Interferometers

M. Kasprzack [1], J. Ramette [2],
[1] Louisiana State University, Baton Rouge, LA, USA
[2] Hillsdale College, Hillsdale, MI, USA

The advanced gravitational wave detectors require injecting a high continuous power laser into the optical cavities of the interferometers to reach their design sensitivity. To mitigate the thermal aberrations created by absorption of this high power load into the various optical elements, thermally actuated devices are installed at strategic places in the instruments, like ring heaters ...

Determination of the Optical Properties of Individual Gold Nanorods through Numerical Modeling and Experiment

Y. Davletshin[1], J.C. Kumaradas[1]
[1]Ryerson University, Toronto, ON, Canada

The optical scattering and absorption of gold nanorods (GNRs) depends on its size, shape, and surroundings. This dependence is due to both intrinsic and extrinsic effects. A good understanding of this dependence is needed for applications of GNRs in photo-thermal therapy, optical and opto-acoustic imaging, biosensing, and other photonic areas. Extrinsic effects are caused by the production of ...