scholarly journals Monochromatic Images of Sunspots in Linearly Polarized Radiation and Structure of their Magnetic Fields

1993 ◽  
Vol 141 ◽  
pp. 115-118
Author(s):  
Ye Shi-Hui ◽  
Jin Jie-Hai
Keyword(s):  
Numerical Simulation ◽  
Magnetic Fields ◽  
Stokes Parameters ◽  
Optical Effect ◽  
Complicated Structure ◽  
Spot Center ◽  
Linearly Polarized ◽  
Magneto Optical Effect ◽  
Linearly Polarized Radiation ◽  
Polarized Radiation

AbstractThe monochromatic images of unipolar sunspots in the Stokes parameters Q and U of magneto-sensitive lines display a complicated structure. This is caused by the magneto-optical effect and also connected with the 3-D structure of spot magnetic fields. In the process of numerical simulation it is possible to check the regularities of the change of the angle of inclination of magnetic lines of force with distance from spot center.

Polarization Aspects of Localized Optical Spots Obtained Using Plasmonic Nano-Antennas

2010 ◽  
Vol 1248 ◽  
Author(s):  
Erdem Ogut ◽  
Kursat Sendur
Keyword(s):  
Electromagnetic Radiation ◽  
Incident Light ◽  
Diffraction Limit ◽  
Stokes Parameters ◽  
Polarization Angle ◽  
All Optical ◽  
Linearly Polarized ◽  
Linearly Polarized Radiation ◽  
Elliptically Polarized ◽  
Polarized Radiation

AbstractElectromagnetic radiation beyond the diffraction limit with a particular polarization emerges as a need for plasmonic applications. One of these applications is all-optical magnetic recording, which requires circularly-polarized electromagnetic radiation. In this study, a plasmonic cross-dipole nano-antenna is illuminated with diffraction-limited linearly polarized radiation. An optimal configuration for the nano-antenna and the polarization angle of the incident light is identified to obtain linearly, circularly, and elliptically polarized optical spots beyond the diffraction limit. The Poincaré sphere representation is utilized to visually present calculated Stokes parameters for optical spots with linear, circular, and elliptical polarizations from specific antenna geometries.

scholarly journals Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 283
Author(s):  
Andrey Ustinov ◽  
Svetlana Khonina ◽  
Alexey Porfirev
Keyword(s):  
Energy Flux ◽  
Poynting Vector ◽  
Numerical Study ◽  
Longitudinal Component ◽  
Light Fields ◽  
Linearly Polarized ◽  
Linearly Polarized Radiation ◽  
Phase Plates ◽  
Spiral Phase ◽  
Polarized Radiation

Recently, there has been increased interest in the shaping of light fields with an inverse energy flux to guide optically trapped nano- and microparticles towards a radiation source. To generate inverse energy flux, non-uniformly polarized laser beams, especially higher-order cylindrical vector beams, are widely used. Here, we demonstrate the use of conventional and so-called generalized spiral phase plates for the formation of light fields with an inverse energy flux when they are illuminated with linearly polarized radiation. We present an analytical and numerical study of the longitudinal and transverse components of the Poynting vector. The conditions for maximizing the negative value of the real part of the longitudinal component of the Poynting vector are obtained.

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