First prototypes of vortex retarders obtained by polarization holography

Piron, Pierre; Blain, Pascal; Décultot, Marc; Mawet, Dimitri; Habraken, Serge

doi:10.1117/12.2052830

Cited by 3 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been reported large inventory of work relating to the possibilities of manipulation of wave fronts via states of polarization using traditional diffraction elements. In particular, polarization controlled holographic vortex studied and developed by Piron could provide some new ideas for designing metasurface holograms [67][68][69][70][71].…”

Section: Huygens Metasurfacesmentioning

confidence: 99%

Microwave metasurface hologram for holographic imaging and its data encryption applications

Rukhlenko

Zhu

2022

J. Opt.

View full text Add to dashboard Cite

Benefiting from the prominent performance in high-density information storage and fast accessing of two-dimensional data, holography has attracted tremendous attentions. The wavefront recoding of traditional holographic devices such as diffraction optical elements suffers from the design complexity and poor resolution as it relies on phase accumulation in the propagating mode, which is achieved by gradually varying the refractive index or thickness of the medium. Ultrathin metasurfaces made of engineered meta-atoms can overcome these limitations owing to their outstanding design flexibility and subwavelength thicknesses. In contrast to the traditional bulky holographic components, the performance of metasurfaces is determined by the electromagnetic response of the meta-atoms with spatially varying in-plane geometric parameters or rotation angles, which enable them to flexibly control the phase, amplitude, wavelength, and polarization of electromagnetic wave. Because of the design flexibility and the capacity of arbitrary wavefront manipulation, metasurfaces are emerging as a promising candidate for holographic memory systems. Here, we review the fast-growing field of metasurface holograms from design principles to recent advances in microwave regime. At the end of the review, we discuss potential applications of the metasurface holography and present a future research outlook.

show abstract

Section: Huygens Metasurfacesmentioning

confidence: 99%

Microwave metasurface hologram for holographic imaging and its data encryption applications

Rukhlenko

Zhu

2022

J. Opt.

View full text Add to dashboard Cite

show abstract

“…15 Moreover, our components were installed on three infrared cameras: VLT-VISIR, VLT-NACO and LBT-LMIRCam. [16][17][18][19] The main advantage of the SG technology over other techniques such as Liquid Crystal Polymers (LCP) 20,21 or Photonic Crystals (PC) 22 is the bandwidth. LCP-and PC-VVCs can be affected by absorption at wavelengths beyond the near-infrared (H band centered at ~1.65µm, K band ~2.2µm).…”

Section: Introductionmentioning

confidence: 99%

Development of a subwavelength grating vortex coronagraph of topological charge 4 (SGVC4)

Delacroix¹,

Absil²,

Carlomagno³

et al. 2014

SPIE Proceedings

View full text Add to dashboard Cite

One possible solution to achieve high contrast direct imaging at a small inner working angle (IW A) is to use a vector vortex coronagraph (VVC), which provides a continuous helical phase ramp in the focal plane of the telescope with a phase singularity in its center. Such an optical vortex is characterized by its topological charge, i.e., the number of times the phase accumulates 27t radians along a closed path surrounding the singularity. Over the past few years, we have been developing a charge-2 VVC induced by rotationally symmetric subwavelength gratings (SGVC2), also known as the Annular Groove Phase Mask (AGPM). Since 2013, several SGVC2s (or AGPMs) were manufactured using synthetic diamond substrate, then validated on dedicated optical benches, and installed on 10-m class telescopes. Increasing the topological charge seems however mandatory for cancelling the light of bright stars which \viii be partially resolved by future Extremely Large Telescopes in the near-infrared. In this paper, we first detail our motivations for developing an SGVC4 (charge 4) dedicated to the near-infrared domain. The challenge lies in the design of the pattern which is unrealistic in the theoretically perfect case, due to state-of-the-art manufacturing limitations. Hence, we propose a new realistic design of SGVC4 \vith minimized discontinuities and optimized phase ramp, showing conclusive improvements over previous works in this field. A preliminary validation of our concept is given based on RCW A simulations, while full 3D finite-difference time-domain simulations (and eventually laboratory tests) will be required for a final validation.

show abstract

“…Thanks to previous experimental work [1,14], it could be determined that the minimal acceptable eccentricity was dependent of the collimation of the recording setup. Indeed, improving the collimation allows a less directional electric field to properly align the polymers of the first layer.…”

Section: Recording Limitsmentioning

confidence: 99%

“…In a previous paper [14], we defined an eccentricity limit e where a more circularly polarized beam is unable to properly align the LCs. Experimentally, it corresponds to the polarization obtained after a linear polarizer and a quarter-wave plate with a fast axis forming an angle of 43°with the incident Fig.…”

Section: Recording Limitsmentioning

confidence: 99%

Polarization holography for vortex retarders recording: laboratory demonstration

et al. 2015

View full text Add to dashboard Cite

This paper will present a prototype of the first set of vortex retarders made of liquid crystal polymers recorded by polarization holography. Vortex retarders are birefringent plates characterized by a rotation of their fast axis. Liquid crystals possess birefringent properties and they are locally orientable. Their orientation is defined by the perpendicular to the local orientation of the recording field. Polarization holography is a purely optical recording method. It is based on the superimposition of coherent and differently polarized beams. It is used to shape the electric field pattern to enable the recording of vortex retarders. The paper details the mathematical model of the superimposition process. The recording setup is exposed; it is characterized by a nearly common path interferometer. Two sets of measurements allowing the prediction of the retarder's features are presented and compared. Finally, the experimentally recorded retarder is shown, its characteristics are investigated and compared to the predicted ones.

show abstract

First prototypes of vortex retarders obtained by polarization holography

Cited by 3 publications

References 13 publications

Microwave metasurface hologram for holographic imaging and its data encryption applications

Microwave metasurface hologram for holographic imaging and its data encryption applications

Development of a subwavelength grating vortex coronagraph of topological charge 4 (SGVC4)

Polarization holography for vortex retarders recording: laboratory demonstration

Contact Info

Product

Resources

About