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

Elliptically Polarized ◽

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.

Obtaining Circularly Polarized Optical Spots Beyond the Diffraction Limit Using Plasmonic Nano-Antennas

MRS Proceedings ◽

10.1557/proc-1208-o21-02 ◽

2009 ◽

Vol 1208 ◽

Author(s):

Erdem Ogut ◽

Gullu Kiziltas ◽

Kursat Sendur

Keyword(s):

Incident Light ◽

Near Field ◽

Diffraction Limit ◽

Polarization Angle ◽

Circularly Polarized ◽

All Optical ◽

Linearly Polarized ◽

Optical Applications ◽

AbstractWith advances in nanotechnology, emerging plasmonic nano-optical applications, such as all-optical magnetic recording, require circularly-polarized electromagnetic radiation beyond the diffraction limit. In this study, a plasmonic cross-dipole nano-antenna is investigated to obtain a circularly polarized near-field optical spot with a size smaller than the diffraction limit of light. The performance of the nano-antenna is investigated through numerical simulations. In the first part of this study, the nano-antenna is illuminated with a diffraction-limited circularly-polarized radiation to obtain circularly polarized optical spots at nanoscale. In the second part, diffraction limited linearly polarized radiation is used. An optimal configuration for the nano-antenna and the polarization angle of the incident light is identified to obtain a circularly polarized optical spot beyond the diffraction limit from a linearly polarized diffraction limited radiation.

A SOFT X-RAY UNDULATOR BEAMLINE AT THE ADVANCED LIGHT SOURCE WITH CIRCULAR AND VARIABLE LINEAR POLARIZATION FOR THE SPECTROSCOPY AND MICROSCOPY OF MAGNETIC MATERIALS

Surface Review and Letters ◽

10.1142/s0218625x02002622 ◽

2002 ◽

Vol 09 (01) ◽

pp. 549-554 ◽

Cited By ~ 15

Author(s):

ANTHONY T. YOUNG ◽

ELKE ARENHOLZ ◽

JUN FENG ◽

HOWARD PADMORE ◽

STEVE MARKS ◽

...

Keyword(s):

Light Source ◽

National Laboratory ◽

X Rays ◽

X Ray ◽

Advanced Light Source ◽

Linearly Polarized ◽

Elliptically Polarized ◽

Photoemission Electron ◽

A new undulator beamline at the Advanced Light Source, Lawrence Berkeley National Laboratory is described. This new beamline has an Apple II type undulator which produces linearly and elliptically polarized X-rays. A high resolution monochromator directs the radiation to two branchlines. The first branchline is optimized for spectroscopy and accommodates multiple endstations simultaneously. The second branchline features a photoemission electron microscope. A novel feature of the beamline is the ability to produce linearly polarized radiation at arbitrary, user-selectable angles. Applications of the new beamline are also described.

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

International Astronomical Union Colloquium ◽

10.1017/s0252921100028906 ◽

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 ◽

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.

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

Photonics ◽

10.3390/photonics8070283 ◽

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 ◽

Phase Plates ◽

Spiral Phase ◽

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.