Siram Sai Krishna, Nuti Venkata Subrahmanya Ayyappa Sai, Dr.K.Srinivasa Rao
Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India
Professor & HOD, Dept. of Electronics and Instrumentation Engineering, Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India
The Micro electro mechanical systems (MEMS) technology provides us a platform to interface between mechanical and electrical components. In this paper, we have designed MEMS accelerometer based on piezoelectric property, and simulated using COMSOL Multiphysics®. The design, which has PZT kept in the annular diaphragm, provides good sensitivity. When this accelerometer is subjected to stress ...
K. Kluczyk, W. Jacak
Institute of Physics, Wrocław University of Technology, Wrocław, Poland
Surface plasmon resonance in metallic nanoparticles is highly and shape dependent, which enables varius applications in photovoltaics, photonics, sensing and even medicine. Particularly we observe redshift in plasmon resonance with increasing nanoparticle size. We investigate nanoparticle size influence on plasmon resonance within theoretical and numerical approach and compare results with ...
N. Shakya , L. Sun ,
 Youngstown State University, Youngstown, OH, USA
Introduction: This study presents the 3D electromagnetic model in layered media using induction logging tool. This algorithm utilizes electromagnetic wave frequency domain (EWFD) interface of Maxwell equations. Electromagnetic methods are popular tools for the measurement of resistivity (or conductivity) of the Earth formation. The purpose of our study is to show the effect of conductivity and ...
S. Tuccio , A. Alabastri, L. Razzari, A. Toma, C. Liberale, R. Proietti Zaccaria, F. De Angelis, G. Das, E. di Fabrizio
Istituto Italiano di Tecnologia, Genova, Italy
Nanoantennas have been successfully employed in a wide set of applications. We show the possibility to expand usual nanoantenna functionalities in the THz domain with a gold dipole nanoantenna. We considered an array of aligned planar gold nanoantennas over a silicon substrate. The high near field enhancement, localized at the device ends, indicates potential uses for THz spectroscopy and ...
M. Csete , A. Szenes , L. Zs. Szabó , G. Szabó , T. Csendes , B. Bánhelyi ,
 Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
 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 ...
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 ...
P. Kumar , S. Kalra, A. Marwaha
Department of Electronics and Communication Engineering, Sant Longowal Institute of Engineering Technology Longowal, Punjab, India
The optimized design of a waveguide applicator has been proposed for superficial microwave hyperthermia using COMSOL Multiphysics 3.5a. In microwave hyperthermia cancer treatment body tissue is exposed to high temperatures using external and internal heating devices. Non-Invasive or external hyperthermia is used to treat tumors that are in or just below the skin (superficial). Non-invasive ...
F. Ye, M. Burns, J. Merlo, M. Naughton
Department of Physics, Boston College, Chestnut Hill, MA, USA
We present the simulation, observation and systematic study of a novel optical phenomenon, a “plasmonic halo”, wherein optically pumped surface plasmons on circular silver microcavities form confined drumhead modes that, under off-resonant conditions, transform to colorful far field radiation at their circumferential boundaries. We simulated the surface plasmon drumhead modes via COMSOL ...
An Assessment of the Suitability of the Body and Adult Head Coils for Transmission during Paediatric Magnetic Resonance Imaging
G.R. Cook, M.J. Graves, F.J. Robb, D.J. Lomas
Department of Radiology, University of Cambridge, Cambridge, United Kingdom
General Electric Healthcare Coils, Aurora, Ohio, USA
MRI offers many advantages over other modalities and its lack of ionizing radiation is important for children, but can be limited by the radio-frequency (RF) coils available. This work calculates Specific Absorption Rate (SAR) and homogeneity of the RF transmit field (B1+) when imaging infants in adult coils. Two birdcage-type coils were loaded by a tissue model and their B1+ homogeneities ...
吴强 , 潘崇佩 , 张琦 ,
“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 ...