Study the enhancement of near electro-magnetic field via plasmonic effects using finite-difference time-domain method and near-field scanning optical microscopy

2006 ◽  
Author(s):  
C.-H. Huang ◽  
C.-Y. Lin ◽  
S.-J. Chen
Keyword(s):  
Magnetic Field ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Near Field ◽  
Electro Magnetic Field ◽  
Scanning Optical Microscopy ◽  
Electro Magnetic ◽  
Near Field Scanning ◽  
Difference Time

scholarly journals Microring Zone Structure for Near-Field Probes

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1363
Author(s):  
Patrik Micek ◽  
Dusan Pudis ◽  
Peter Gaso ◽  
Jana Durisova ◽  
Daniel Jandura
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Near Field ◽  
Depth Of Field ◽  
Zone Structure ◽  
New Approach ◽  
Fdtd Simulations ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning ◽  
Difference Time

Recent advances in Surface Plasmon Resonance (SPR) technologies have shown the possibility of transmission enhancement of localized modes propagating through sub-diffraction wide slits and apertures, resulting in the strong near-field focusing of metallic planar nanostructures. This work presents a new approach to the fabrication of high-resolution near-field optical probes using 3D lithography in combination with numerical finite difference time domain (FDTD) simulations. A narrow 500 nm depth of field focus area was observed both by numerical analysis and near field scanning optical microscopy (NSOM) measurements. Further research and optimization are planned in order to achieve subwavelength focal regions and increased signal intensities.

Three-Dimensional Finite-Difference Time-Domain Method Modeling of Nanowire Optical Probe

2014 ◽  
Vol 602-605 ◽  
pp. 3359-3362
Author(s):  
Chun Li Zhu ◽  
Jing Li
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Incident Light ◽  
Near Field ◽  
Three Dimensional ◽  
Polarization Direction ◽  
Near Field Imaging ◽  
Difference Time ◽  
Field Imaging

In this paper, output near fields of nanowires with different optical and structure configurations are calculated by using the three-dimensional finite-difference time-domain (3D FDTD) method. Then a nanowire with suitable near field distribution is chosen as the probe for scanning dielectric and metal nanogratings. Scanning results show that the resolution in near-field imaging of dielectric nanogratings can be as low as 80nm, and the imaging results are greatly influenced by the polarization direction of the incident light. Compared with dielectric nanogratings, metal nanogratings have significantly enhanced resolutions when the arrangement of gratings is perpendicular to the polarization direction of the incident light due to the enhancement effect of the localized surface plasmons (SPs). Results presented here could offer valuable references for practical applications in near-field imaging with nanowires as optical probes.

Damage Efficiency Research of PCB Components under Strong Electromagnetic Pulse

2011 ◽  
Vol 130-134 ◽  
pp. 1383-1386 ◽  
Author(s):  
Fei Xie ◽  
Bing Cao ◽  
Cheng Long Liu
Keyword(s):  
Finite Difference ◽  
Field Strength ◽  
Power Density ◽  
Time Domain ◽  
Rise Time ◽  
Finite Difference Time Domain ◽  
Electromagnetic Pulse ◽  
Magnetic Pulse ◽  
Electro Magnetic ◽  
Difference Time

To study damage effectiveness of strong electro-magnetic pulse to components of equipments, the power density in area of MOS circuit, diodes and transistor of a computer is simulated, using the method of the finite-difference time-domain (FDTD). Coupling laws in different areas are achieved, and then judging the damage efficiency of components. Electromagnetic pulse reflects constantly in computer box, causing power density appears oscillations. Energy gradually declines to zero, for it radiates outward from slots. Field concentration around PCB board results in dissociation of field strength, and slows down the attenuation of energy. Finally, formula of power density at random field strength and rise time is also obtained.

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