Formation of linearly polarized light with axial symmetry by use of space-variant subwavelength gratings

2003 ◽  
Vol 28 (7) ◽  
pp. 510 ◽  
Author(s):  
Avi Niv ◽  
Gabriel Biener ◽  
Vladimir Kleiner ◽  
Erez Hasman
Keyword(s):  
Axial Symmetry ◽  
Polarized Light ◽  
Use Of Space ◽  
Subwavelength Gratings ◽  
Linearly Polarized ◽  
Space Variant

scholarly journals Sharp focus of a circularly polarized optical vortex at the output of a metalens illuminated by linearly polarized light

2019 ◽  
Vol 43 (4) ◽  
pp. 528-534
Author(s):  
A.G. Nalimov ◽  
V.V. Kotlyar
Keyword(s):  
Silicon Film ◽  
Polarized Light ◽  
Optical Vortex ◽  
Quarter Wave Plate ◽  
Phase Plate ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Subwavelength Gratings ◽  
Linearly Polarized ◽  
Quarter Wave

A three-level spiral metalens in an amorphous silicon film is designed. The metalens relief consists of two subwavelength gratings with a 220-nm period (for 633 nm wavelength) and depths of 90 and 170 nm. The metalens forms a left-hand circular polarized optical vortex with topological charge 2 when illuminated by a linearly polarized plane wave. The intensity distribution at a distance of 633 nm is in the form of a subwavelength circle, whereas the longitudinal projection of the Pointing vector has negative values on the optical axis, meaning that a backward energy flow occurs. Two subwavelength gratings with different depth act as quarter-wave plates, transforming linearly polarized light into circularly polarized light with a phase delay of (lambda)/2. This metalens combines functionalities of three optical elements: a quarter-wave plate, a spiral phase plate, and a high-NA diffraction metalens (NA close to unity).

Polarization: Spatial Fourier-Transform Polarimetry By Use of Space-Variant Subwavelength Gratings

2003 ◽  
Vol 14 (12) ◽  
pp. 34 ◽  
Author(s):  
Erez Hasman ◽  
Gabriel Biener ◽  
Vladimir Kleiner ◽  
Avi Niv
Keyword(s):  
Fourier Transform ◽  
Use Of Space ◽  
Subwavelength Gratings ◽  
Space Variant

scholarly journals Metasurface of Combined Semicircular Rings with Orthogonal Slit Pairs for Generation of Dual Vector Beams

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1718
Author(s):  
Qian Kong ◽  
Manna Gu ◽  
Xiangyu Zeng ◽  
Rui Sun ◽  
Yuqin Zhang ◽  
...  
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Polarized Light ◽  
Orientation Angle ◽  
Fdtd Simulation ◽  
Dual Vector ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Difference Time

Manipulation of multichannel vector beams (VBs) with metasurfaces is an important topic and holds potential applications in information technology. In this paper, we propose a novel metasurface for the generation of dual VBs, which is composed of orthogonal slit pairs arranged on multiple groups of combined semicircular rings (CSRs). A group of CSRs include a right-shifted set and a left-shifted set of semicircular rings, and each set of semicircular rings has two halves of circles with different radii, sharing the same shifted center. Under the illumination of linearly polarized light, the two shifted sets of semicircular rings generate the two VBs at the shifted center positions on the observation plane. The slit units of each set are designed with independent rotation order and initial orientation angle. By adjusting the linear polarization of illumination, both two VBs with their orders and polarization states are independently controlled simultaneously. The principle and design are demonstrated by the finite-difference time domain (FDTD) simulation. The work is of significance for miniatured devices of VB generators and for related applications.

Generation of Concentric Space-Variant Linear Polarized Light by Dielectric Metalens

Nano Letters ◽  
2020 ◽  
Author(s):  
Wen-Hao Chang ◽  
Jun-Han Lin ◽  
Chieh-Hsiung Kuan ◽  
Ssu-Yen Huang ◽  
Yann-Wen Lan ◽  
...  
Keyword(s):  
Polarized Light ◽  
Space Variant

scholarly journals Formation of half-period surface relief gratings in azobenzene containing polymer films

2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Joachim Jelken ◽  
Carsten Henkel ◽  
Svetlana Santer
Keyword(s):  
Polymer Film ◽  
Polymer Films ◽  
Surface Relief ◽  
Incident Light ◽  
Glassy State ◽  
Polarized Light ◽  
Half Period ◽  
Polarization Distribution ◽  
Linearly Polarized ◽  
Set Up

Abstract We study the peculiar response of photo-sensitive polymer films irradiated with a certain type of interference pattern where one interfering beam is S-polarized, while the second one is P-polarized. The polymer film, although in a glassy state, deforms following the local polarization distribution of the incident light, and a surface relief grating (SRG) appears whose period is half the optical one. All other types of interference patterns result in the matching of both periods. The topographical response is triggered by the alignment of photo-responsive azobenzene containing polymer side chains orthogonal to the local electrical field, resulting in a bulk birefringence grating (BBG). We investigate the process of dual grating formation (SRG and BBG) in a polymer film utilizing a dedicated set-up that combines probe beam diffraction and atomic force microscopy (AFM) measurements, and permits acquiring in situ and in real-time information about changes in local topography and birefringence. We find that the SRG maxima appear at the positions of linearly polarized light (tilted by 45° relative to the grating vector), causing the formation of the half-period topography. This permits to inscribe symmetric and asymmetric topography gratings with sub-wavelength period, while changing only slightly the polarization of one of the interfering beams. We demonstrate an easy generation of sawtooth profiles (blazed gratings) with adjustable shape. With these results, we have taken a significant step in understanding the photo-induced deformation of azo-polymer films.

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