Software for determining field distribution inside bio-objects using FDTD method

2003 ◽  
Author(s):  
S. Banerjee ◽  
S. Roy ◽  
S.K. Singh ◽  
K.K. Goswami ◽  
T.K. Dey
Keyword(s):  
Field Distribution ◽  
Fdtd Method

Distribution of Electromagnetic Field and Energy Flux in the Thin Film Solar Cell with Silver Nano-Disk Array

2013 ◽  
Vol 669 ◽  
pp. 194-203
Author(s):  
Hong Zhou ◽  
Xiao Ping Huang ◽  
Lei Zhong ◽  
Sheng Kang Ji ◽  
Yan Pang ◽  
...  
Keyword(s):  
Thin Film ◽  
Electromagnetic Field ◽  
Solar Cell ◽  
Field Distribution ◽  
Energy Flux ◽  
Thin Film Solar Cell ◽  
Incident Light ◽  
Fdtd Method ◽  
Absorption Enhancement ◽  
Electromagnetic Field Distribution

We simulate and calculate numerically the electromagnetic field and energy flux in single crystal silicon thin film solar cell coated with silver nano-disk square array by using the finite-difference time-domain (FDTD) method. Because of the surface plasmon resonance (SPR) of silver nano array, the electromagnetic field is redistributed and enhanced in the solar cell. The simulation results show that the electromagnetic field distribution and corresponding energy flux component depend on the nano array and the structure of absorbed layer in solar cell. The wavelength of the incident light relative to the nano array determine the profile of the electric field around the nano array. The electromagnetic field distribution in thin film is determined by the internal structure of solar cell. For different incident wavelengths, the electromagnetic field distribution in solar cell will changes. The energy flux named as Poynting vector also changes with the incident wavelength. To investigate the absorption of the solar cell, the normalized absorbed power at different wavelengths is calculated. Based on the SPR effect, the solar cell exhibts absorption enhancement sharply at a certain wavelength.

Study on the Characteristics of High Speed near Field Communication Antenna Based on FDTD

2014 ◽  
Vol 1044-1045 ◽  
pp. 1362-1365
Author(s):  
Yan Feng Liu ◽  
Bing Wei
Keyword(s):  
Numerical Simulation ◽  
Field Distribution ◽  
Electric Dipole ◽  
High Speed ◽  
Near Field ◽  
Fdtd Method ◽  
Near Field Communication ◽  
Calculation Results ◽  
The Ideal

The near-field characteristics of the ideal electric dipole are analyzed in this paper. A practical ultrafast band antenna near field FDTD is made and the near field distribution of the antenna is studied by numerical simulation. The calculation results show that the FDTD method is used for the analysis of feasibility and reliability of the near-field communication antenna.

SNOM INVESTIGATION OF THE ELECTROMAGNETIC FIELD INTENSITY AND POLARIZATION DISTRIBUTION IN THE VICINITY OF NANOSTRUCTURES

2004 ◽  
Vol 03 (01n02) ◽  
pp. 105-113 ◽  
Author(s):  
M. V. BASHEVOY ◽  
A. A. EZHOV ◽  
S. A. MAGNITSKII ◽  
D. A. MUZYCHENKO ◽  
V. I. PANOV ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Field Distribution ◽  
Near Field ◽  
Qualitative Difference ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Polarization Distribution ◽  
Electromagnetic Field Distribution ◽  
Surface Steps ◽  
Gap Control

The experimental and calculated results of the investigation of electromagnetic field distribution including its polarization characteristics in the vicinity of the nanostructures are presented. The experimental investigation was realized by aperture type scanning near field optical microscopes (SNOMs) which operated in collection mode. Normal resolution which allows us to image down to 0.3 nm height surface steps was demonstrated for the shear force probe to surface gap control system of the SNOM. Theoretical computation of the electromagnetic field distribution was realized by finite-difference time-domain (FDTD) method. The experimental three-dimensional maps of intensity and polarization distribution as a result of light diffraction at nanoaperture in the metal screen, dielectric and metallized nanocylinders were obtained. The qualitative difference between the orthogonal polarized component distributions near nanoaperture was experimentally shown. The electromagnetic field concentration in the proximity of the dielectric nanocylinders was observed. This observation gives a good fit with the results of FDTD computations. A spiral type electromagnetic field distribution pattern was experimentally observed in the proximity of metallized nanocylinders, which is unexpected from both experimental and theoretical points of view.

scholarly journals Effect of Electric Field Distribution on the Heating Uniformity of a Model Ready-to-Eat Meal in Microwave-Assisted Thermal Sterilization Using the FDTD Method

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 311
Author(s):  
Yoon-Ki Hong ◽  
Roger Stanley ◽  
Juming Tang ◽  
Lan Bui ◽  
Amir Ghandi
Keyword(s):  
Electric Field ◽  
Microwave Heating ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Fdtd Method ◽  
Digital Twin ◽  
Microwave Assisted ◽  
Heating Uniformity ◽  
Thermal Sterilization ◽  
Heating Pattern

Microwave assisted thermal sterilization (MATS) is a novel microwave technology currently used in the commercial production of ready-to-eat meals. It combines surface heating of high-temperature circulation water with internal microwave heating in cavities. The heating pattern inside the food packages in a MATS process depends heavily on the electric field distribution formed by microwaves from the top and bottom windows of the microwave heating cavities. The purpose of this research was to study the effect of the electric field on 922 MHz microwave heating of ready-to-eat meals as they moved through the microwave chamber of a pilot-scale MATS system using the finite-difference time-domain (FDTD) method. A three-dimensional numerical simulation model was developed as a digital twin of the MATS process of food moving through the microwave chamber. The simulation showed that the electric field intensity of the MATS microwave cavity was greatest on the surface and side edge of the cavity and of the food. There was a strong similarity of the experimental heating pattern with that of the electric field distribution simulated by a computer model. The digital twin modeling approach can be used to design options for improving the heating uniformity and throughput of ready-to-eat meals in MATS industrial systems.

Enhanced Light Trapping in Periodic Aluminum Nanorod Arrays as Cavity Resonator

2013 ◽  
Vol 1566 ◽  
Author(s):  
Rosure B. Abdulrahman ◽  
Arif S. Alagoz ◽  
Tansel Karabacak
Keyword(s):  
Field Distribution ◽  
Light Trapping ◽  
Incident Light ◽  
Fdtd Method ◽  
Cavity Resonator ◽  
Nanorod Arrays ◽  
Resonant Modes ◽  
Average Reflectance ◽  
Em Field ◽  
Al Thin Film

ABSTRACTMetallic nanostructures can exhibit different optical properties compared to bulk materials mainly depending on their shape, size, and separation. We present the results of an optical modeling study on ordered arrays of aluminum (Al) nanorods with a hexagonal periodic geometry placed on an Al thin film. We used a finite-difference time-domain (FDTD) method to solve the Maxwell's equations and predict the reflectance of the nanorod arrays. The thickness of the base Al film was set to 100 nm, and diameter, height and nanorod center-to-center periodicity were varied. Incident light in the FDTD simulations was an EM-circular polarized plane wave and reflectance profiles were calculated in the wavelength range 200-1800 nm. In addition, we calculated spatial electric field intensity distributions around the nanorods for wavelengths 300, 500, and 700 nm. Our results show that average reflectance of Al nanorods can drop down to as low as ∼50%, which is significantly lower than the ∼90% reflectance of conventional flat Al film at similar wavelengths. In addition to the overall decrease in reflectance, Al nanorod arrays manifest multiple resonant modes (higher-order modes) indicated by several dips in their reflectance spectrums (i.e. multiple attenuation peaks in their absorption profiles). Positions of these dips in the reflectance spectrum and spatial EM field distribution vary with nanorod height and diameter. Multiple reflectance peaks are explained by cavity resonator effects. Spatial EM field distribution profiles indicate enhanced light trapping among the nanorods, which can be useful especially in optoelectronic and solar cell applications.

High Resolution Specimen Area Imaged Under Negligible Field Aberrations

1970 ◽  
Vol 28 ◽  
pp. 540-541 ◽  
Author(s):  
T. Yanaka ◽  
K. Shirota
Keyword(s):  
High Resolution ◽  
Field Distribution ◽  
Image Space ◽  
Beam Deflection ◽  
Objective Lens ◽  
Resolution Limit ◽  
Leakage Flux ◽  
Specimen Area ◽  
Points Of View ◽  
Aberration Theory

It is significant to note field aberrations (chromatic field aberration, coma, astigmatism and blurring due to curvature of field, defined by Glaser's aberration theory relative to the Blenden Freien System) of the objective lens in connection with the following three points of view; field aberrations increase as the resolution of the axial point improves by increasing the lens excitation (k2) and decreasing the half width value (d) of the axial lens field distribution; when one or all of the imaging lenses have axial imperfections such as beam deflection in image space by the asymmetrical magnetic leakage flux, the apparent axial point has field aberrations which prevent the theoretical resolution limit from being obtained.

Field Distribution of Strongly Excited Magnetic Lenses

1975 ◽  
Vol 33 ◽  
pp. 140-141
Author(s):  
M. Strojnik
Keyword(s):  
Flux Density ◽  
Field Distribution ◽  
Optical Axis ◽  
Operating Point ◽  
Pole Piece ◽  
Partial Saturation ◽  
Axial Flux ◽  
The Stability

Magnetic lenses operating in partial saturation offer two advantages in HVEM: they exhibit small cs and cc and their power depends little on the excitation IN. Curve H, Fig. 1, shows that the maximal axial flux density Bz max of one of the lenses investigated changes between points (3) and (4) by 5% as the excitation varies by 40%. Consequently, the designer can relax the requirements concerning the stability of the lens current supplies. Saturated lenses, however, can only be used if (i) unwanted fields along the optical axis can be controlled, (ii) 'wobbling' of the optical axis due to inhomogeneous saturation around the pole piece faces is prevented, (iii) ample ampere-turns can be squeezed into the space available, and (iv) the lens operating point covers a sufficient range of accelerating voltages.

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