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.
COMSOL News Magazine 2017

Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy: Insight from Simulations with COMSOL Multiphysics® Software

Song-Yuan Ding [1], Jun Yi [1], En-Ming You [1], Zhong-Qun Tian [1],
[1] State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, Xiamen, China

Surface-enhanced Raman spectroscopy (SERS) has been developed as a versatile tool for trace-molecule detection and biomolecular analysis by coupled gold or silver nanostructures in the past two decades. However, SERS suffers from a long-term limitation of application for surface analysis of general materials. That is because the SERS hotspots in inter-particle nanogap generated from coupled ...

Forces and Heating in Plasmonic Particles

M. Gonçalves[1], O. Marti[1]
[1]Ulm University - Inst. of Experimental Physics, Ulm, Germany

Plasmonic resonances arising in gold nanoparticles lead to strongly localized near-field enhancements. These enhancements generate strong field gradients that can be exploited in particle trapping. On the other hand plasmonic resonances lead to enhanced absorption and heat generation. Gold nanoparticles have been used to kill cancer cells based on plasmonic heating. We have investigated the ...

Study of the Structure of Photonic Crystal Fiber with High Negative Dispersion Coefficient

Jiang Xing-fang [1], Sun Chen-yang [1], Li Xin-lu [1],
[1] Changzhou University, Changzhou, China

The optical fiber communication has been popular topics besides robot study nowadays. In the process of the Dense Wave-Length Division Multiplexing (DWDM) study, the dispersion compensate for the traditional optical fiber is difficult to solve for long distance transport information. It is hard to solve this problem by experimental study on photonic crystals with high negative dispersion ...

Modeling Internal Heating of Optoelectronic Devices Using COMSOL

N. Brunner[1][,][2]
[1]Voxtel, Inc, Beaverton, OR, USA
[2]University of Oregon, Eugene, OR, USA

In this paper the heat transfer module in COMSOL is utilized to simulate internal heating of an Avalanche Photodiode due to light-induced current through a resistivity that depends on charge carrier concentrations in the device. Initial tests are done by modeling the heating process on a previously-solved silicon p-n junction as a proof of concept before advancing to a more complicated geometry. ...

Design and Optimization of Electrostatically Actuated Micromirror

Anna Thomas[1], Juny Thomas[1], Deepika Vijayan[1], K.Govardhan[2]
[1]VIT University, Sensor System Technology, School of Electronics Engineering, Vellore, Tamil Nadu, India
[2]VIT University, MEMS & Sensor Division, School of Electronics Engineering, Vellore, Tamil Nadu, India

The microscopic size of MEMS devices accounts for strong coupling effects which arise between the different physical fields and forces. Micromirrors are essential parts of microswitches in fiber optic network telecommunication. They are usually 1 to 3 mm in size, fabricated from single crystalline silicon and mostly are electrostatically actuated. The objective is to design the micromirror to ...

Ultrafast Effects in 3D Metamaterials

N. Katte [1], P. Evans [2],
[1] Wilberforce University, Wilberforce, OH, USA
[2] Oak Ridge National Laboratory, Oak Ridge, TN, USA

The extraordinary electromagnetic response of nanostructured material, usually made up of a metallic structures distributed in within a dielectric matrix has attracted a lot of interest in recent years. These materials are technically called metamaterial (MM) since they possess different properties from their constituent materials. Several applications of metamaterials have already been ...

Enhancing Fluorescence of Diamond Color Centers near Gold Nanorods via Geometry Optimization

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

Detecting light emitted by fluorescent molecules with resolution down to single photon is an important problem in various fields of sciences and applications, such as solid-state physics, quantum information processing and medicine. The detection probability can be improved via enhancement of excitation and emission. Enhancement both of these processes can be reached by localized surface plasmon ...

Modeling PIN Photodiodes

R.W. Pryor
Pryor Knowledge Systems Inc., Bloomfield Hills, MI, USA

This paper presents one approach to the modeling of an abrupt junction PIN photodiode light sensor using COMSOL Multiphysics software and the incorporated SPICE® capability. The current model is built using the capabilities of SPICE in COMSOL Multiphysics 4.0. This model demonstrates the use of SPICE and the AC/DC Module to build a conduction current, rather than an electrostatic, model. This ...

Simulating the Response of Planar Photonic Structures Under the Strain of Surface Acoustic Waves

O. D. D. Couto Jr. [1], A. C. T. Covacevice [1],
[1] Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Campinas, SP, Brazil

In this contribution, we simulate the optical response of piezoelectric planar optical microcavities (POMCs) under the modulation introduced by a propagating surface acoustic wave (SAW). The physical picture of the model is shown in Figure 1. A metallic interdigital transducer (IDT) is placed on the sample surface and, via inverse piezoelectric effect, is responsible for the generation of SAWs ...

Effects of Forced Airflow Cooling on Laser Beam Heating of Volume Bragg Gratings

S. Kaim[1], B. Anderson[1], G. Venus[1], J. Lumeau[1], V. Smirnov[2], B. Zeldovich[1], L. Glebov[1]
[1]CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
[2]OptiGrate Corp, Oviedo, FL, USA

Forced airflow cooling of a Volume Bragg Grating heated by a laser beam was investigated by means of simulation with COMSOL Multiphysics®. In addition to air cooling of unrestricted airflow, a case of airflow directed by limiting glass plates was investigated. A number of temperature distributions and thermal deformations were obtained in simulations for different rates of airflows. Simulations ...