Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

太赫兹声子极化激元的产生及与金属天线的相互作用

吴强 [1], 潘崇佩 [1], 张琦 [1],
[1] 南开大学,天津,中国

“极化激元”是固体物理学中的重要概念,泛指各种极性元激发与光子的耦合。其中,声子极化激元是指晶格振动的声子与电磁场中的光子相互耦合的一种极化激元波。使用飞秒光在铁电晶体铌酸锂中通过光学非线性效应可产生声子极化激元,其频率位于太赫兹波段,在晶格的振动弛豫、太赫兹光谱、与介观微结构作用等领域已有广泛应用。 声子极化激元涉及电磁场和晶格场的耦合问题,其形式满足黄昆方程。我们使用 COMSOL Multiphysics® 的多物理场(偏微分方程组以及射频模块)模拟了块状铌酸锂晶体中产生声子极化激元波的产生和传输。 铌酸锂晶体作为太赫兹应用的集成化平台,可通过在平板波导上引入微结构实现对太赫兹波的调控。诸多手段中,太赫兹天线作为电磁场的传播场与局域场转换的关键部件,对太赫兹通信和太赫兹光谱等领域都有不可替代的作用。基于这一点,我们设计了一种尖端相对的棒状天线结构,使用 COMSOL ...

Optimal Design for the Grating Coupler of Surface Plasmons

Y. Huang

Mathematics Department, University of California, Los Angeles, CA, USA

We present an optimization procedure to optimize the maximum coupling of free space optical wave to surface plasmon. Shape derivative from shape sensitivity analysis is calculated, and the corresponding partial derivatives of the objective functional with respect to finite number of design variables are derived. An optimal design of the gratings to couple maximum amount of free space photon ...

Highly Sensitive Grating-Coupled Bloch Surface Wave Resonance Biosensor via Azimuthal Interrogation

V. Koju [1], W. M. Robertson [1],
[1] Middle Tennessee State University, Murfreesboro, TN, USA

A dielectric multilayer structure, with a grating profile on the surface layer, can couple light into a strongly confined surface wave, known as a Bloch surface wave. These surface modes can be used to design bio-sensors. The corrugated surface structure also enables azimuthal angular excitation of Bloch waves. In this paper, we exploit azimuthal interrogation to design highly sensitive Bloch ...

Electromagnetic Analysis of Cloaking Metamaterial Structures

E. Furlani, and A. Baev
The Institute for Lasers, Photonics and Biophotonics, University at Buffalo, Buffalo, NY, USA

We study cylindrical and spherical shell structures that have cloaking material properties proposed by Pendry et al. We use 2D and 3D time-harmonic analysis to study the field distribution and power flow for various arrangements of these structures. We have shown that the COMSOL RF solver is well suited for the analysis of cloaking metamaterial structures If cloaking material properties can be ...

Study of Energy Transfer Mechanism for a Synchrotron X-ray Gas Absorber with COMSOL Multiphysics

A. Martín Ortega [1], Y. Dabin [1], T. Minea [2], A. Lacoste [3]
[1] ESRF, Grenoble, France
[2] LPGP, Université Paris-Sud XI, Orsay, France
[3] LPSC, Université Joseph Fourier, Grenoble, France

The high power of X-ray beam delivered by synchrotrons and free electron lasers, up to 240 W/mm2, requires heat load management solutions to obtain the best performance from the optical elements which will shape the beam for its use in the experimental stations [1]. One solution is the use of gas attenuators: a tube filled with an inert gas, usually Argon or Krypton, is placed between X-ray ...

Multiphysics Modeling of Electro-Optic Devices

J. Toney
Srico, Inc.
Columbus, OH

Designers of electro-optic modulators and related devices often use separate tools to study the optical and electrical portions of the device. The flexibility of COMSOL Multiphysics makes it possible to construct unified models of EO phenomena including realistic waveguide profiles and anisotropic material properties. We demonstrate the use of the RF Module to compute both RF and optical ...

Design of Next Generation Mid-infrared Fiber Optics

X. Ji [1], R. Page [2], V. Gopalan [1],
[1] Pennsylvania State University, State College, PA, USA
[2] Pacific Lutheran University, Tacoma, WA, USA

Optical fibers that can deliver mid-infrared light in a wide wavelength range are in high demand due to their significant potentials in sensors, chemical imaging, optoelectronics and nonlinear optics applications. Semiconductors such as Ge, ZnSe and Si are good infrared-transparent materials. Using these materials as the fiber cores and silica as the fiber cladding offers opportunities in ...

Modeling of a Diffraction Grating Coupled Waveguide Based Biosensor for Microfluidic Applications

Y. Wu [1], M. L. Adams [1],
[1] Auburn University, Auburn, AL, USA

Grating couplers are a common optical component for introducing light into chip-based photonic structures. They are used extensively for optical interconnects and optical device integration. A microfluidic diffraction grating coupled waveguide (MDGCW) biosensor applies a grating coupler for label-free detection of a biological analyte. A novel MDGCW is modeled and the results presented. The ...

Modeling of an Optical Black Hole with True Gaussian Beam Incidence

X. Ni[1], A. Kildishev[1], E. Narimanov[1], and L. Prokopeva[2]
[1]Purdue University, West Lafayette, IN, USA
[2]Russian Academy of Sciences, Novosibirsk, Russia

We model an ideal optical black hole device in COMSOL Multiphysics as an electromagnetic scattering problem. The device is illuminated with a Gaussian beam which is focused at a fixed position in horizontal direction (x0) and different positions in vertical direction (y0). The device is modeled as a cylindrical system with a gradient-index shell and absorbing core. Using the classical paraxial ...

Going beyond Axisymmetry: 2.5D Vector Electromagnetics

Y.A. Urzhumov[1][,][2], N.I. Landy[1][,][2], C. Ciraci[2], D.R. Smith[1][,][2]
[1]Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, NC, USA
[2]Center for Metamaterials and Integrated Plasmonics, Pratt School of Engineering, Duke University, Durham, NC, USA

Linear wave propagation through inhomogeneous structures of size R?? (Fig.1) is a computationally challenging problem, in particular when using finite element methods, due to the steep increase of the number of degrees of freedom as a function of R/?. Fortunately, when the geometry of the problem possesses symmetries, one may choose an appropriate basis in which the stiffness matrix of the ...