H.-H. Yeh, Y.-F. Chau
Department of Electronic Engineering, Ching Yun University, Taiwan
High birefringence induced by complex unit cells of elliptical air holes in photonic crystal fibers (PCFs) is analyzed numerically using COMSOL Multiphysics. Two types of our proposed PCFs and a previous structure are investigated. The statistical correlations between the birefringence and the various parameters are obtained. The birefringence is found to be largely dependent on the variation of ...
E. Furlani, and A. Baev
The Institute for Lasers, Photonics and Biophotonics, University at Buffalo, Buffalo, NY, USA
Plasmonic-based optical trapping is in its infancy and growing rapidly. Research in this area will significantly advance fundamental understanding in fields such as nanophotonics and biophotonics. Novel plasmonic trapping structures and systems can be designed and optimized using the COMSOL RF solver. We present a study of plasmonicbased optical trapping of neutral sub-wavelength ...
COMSOL Multiphysics Super Resolution Analysis of a Spherical Geodesic Waveguide Suitable for Manufacturing
H. Ahmadpanahi, D. Grabovi?ki?, J.C. González, P. Benítez, J.C. Miñano
Cedint Universidad Politécnica de Madrid, Madrid, Spain
Recently it has been proved theoretically (Miñano et al, 2011) that the super-resolution up to ? /500 can be achieved using an ideal metallic Spherical Geodesic Waveguide (SGW). This SGW is as a theoretical design, in which the conductive walls are considered to be lossless conductors with zero thickness. In this paper, we study some key parameters that might influence the super resolution ...
L. Mahler, A. Tredicucci, and F. Beltram
NEST-INFM and Scuola Normale Superiore, Pisa, Italy
We describe the modeling of microdisk lasers displaying vertical emission. The devices are THz quantum cascade lasers with metallic gratings fabricated along the circumference. The emission properties of the fabricated devices are well explained by the model, good mode control is obtained, and the collected power from a patterned device is increased 50 times with respect to unpatterned ...
J. McGuirk and P. Collins
Air Force Institute of Technology, WPAFB, OH, USA
The performance of simplified cylindrical cloaks with various material parameters was investigated. The performance metric was the overall scattering width of the cloak with various objects in the hidden region. COMSOL was used to simulate three cloaks with different material parameters to determine the total field in the simulation domain. For all cloaks simulated in this effort, a PEC-lined ...
Peking University, Beijing, China
Surface plasmon polaritons (SPPs), which are confined along metal-dielectric interfaces, have attracted great interest in the area of ultracompact photonic circuits due to their strong field confinement and enhancement. COMSOL Multiphysics is an efficient and powerful software package to simulate the characteristics of SPPs. In recent years, we did some works on SPPs in experiments as well as ...
A Study of Distributed Feed-Back Fiber Laser Sensor for Aeronautical Applications Using COMSOL Multiphysics
I. Lancranjan, C. Gavrila, S. Miclos, and D. Savastru
Advanced Study Centre - National Institute for Aerospace Research Elie Carafoli, Bucharest, Romania
Technical University of Civil Engineering Bucharest, Romania
National Institute R&D of Optoelectronics, INOE 2000, Bucharest, Romania
Distributed Feedback Fiber Laser (DFB-FL) sensors are increasingly used in aeronautical applications. One of the newest such applications consists in detecting the “transition” zone between laminar and turbulent air flow upon the extrados surface of an aircraft wing. In this specific application DFB-FL are operated as air pressure sensors monitoring amplitude variations of ~1 Pa (laminar ...
Time-Resolved Optical Tomography in Preclinical Studies: Propagation of Excitation and Fluorescence Photons.
F. Nouizi, R. Chabrier, M. Torregrossa, and P. Poulet
Laboratoire d’Imagerie et de Neurosciences Cognitives, Straßbourg, France
Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection, France
We present time-resolved methods that rely on near-infrared photons to image the optical properties and distribution of fluorescent probes in small laboratory animals. The coupled diffusion equations of excitation and fluorescence photons in highly scattering tissues were solved using the three-dimensional Finite Element Method (FEM) provided by COMSOL. The computed results allowed to yield ...
M. J. Li, J. A. West, and K. W. Koch
Science and Technology Division, Corning Inc., Corning, NY, USA
The cross-section of a real air-core photonic band-gap fiber with structural distortions is analyzed using a vectorial finite element method and compared with an ideal structure.It is found that the properties of aircore photonic band-gap fibers are extremely sensitive to changes of the structural parameters. Structural distortions in real fibers have significant impact on fiber properties such ...
Modeling of III-Nitride Quantum Wells with Arbitrary Crystallographic Orientation for Nitride-Based Photonics
M. Kisin, R. Brown, and H. El-Ghoroury
Ostendo Technologies, Inc., Carlsbad, CA, USA
A program for self-consistent modeling of electron-hole energy spectrum and space-charge distribution in III-nitride based quantum well (QW) structures has been developed. The model takes into consideration full 6-band description of the valence band states, nonparabolicity of the electron spectrum, quantum confinement of electrons and holes, strain induced modifications of the band structure, ...