Generation of integer and fractional vector beams with q-plates encoded onto a spatial light modulator

Moreno, Ignacio; Sánchez-López, Marı́a del Mar; Badham, Katherine; Davis, Jeffrey A.; Cottrell, Don M.

doi:10.1364/ol.41.001305

Cited by 54 publications

(33 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental system is inspired in a previous decomposition of the q -plate Jones matrix 27 . A general q -plate 10 can be described with the following Jones matrix:where θ is the azimuth angle.…”

Section: Methods and Techniquesmentioning

confidence: 99%

“…27 to generate q -plates, with arbitrary integer and fractional q values. This is achieved by encoding spiral phases with opposite sense in each side of the SLM.…”

Section: Methods and Techniquesmentioning

confidence: 99%

“…Alternatively, they can be encoded using spatial light modulators (SLM) 26, 27 . The flexibility provided by SLMs allows the generation of arbitrary q -plates.…”

Section: Introductionmentioning

confidence: 99%

“…Using our approach for generating q -plates 27 , we make a vector beam diffraction grating that simultaneously creates 6 different vector beams with different charges in the horizontal diffracted orders. In addition, we combine this with a previously reported polarization diffraction grating 17 in the vertical diffracted orders where each order has a different polarization state on the zero-order Poincaré sphere.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vector Beam Polarization State Spectrum Analyzer

Moreno

Davis

Badham

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

We present a proof of concept for a vector beam polarization state spectrum analyzer based on the combination of a polarization diffraction grating (PDG) and an encoded harmonic q-plate grating (QPG). As a result, a two-dimensional polarization diffraction grating is formed that generates six different q-plate channels with topological charges from −3 to +3 in the horizontal direction, and each is split in the vertical direction into the six polarization channels at the cardinal points of the corresponding higher-order Poincaré sphere. Consequently, 36 different channels are generated in parallel. This special polarization diffractive element is experimentally demonstrated using a single phase-only spatial light modulator in a reflective optical architecture. Finally, we show that this system can be used as a vector beam polarization state spectrum analyzer, where both the topological charge and the state of polarization of an input vector beam can be simultaneously determined in a single experiment. We expect that these results would be useful for applications in optical communications.

show abstract

Section: Methods and Techniquesmentioning

confidence: 99%

“…27 to generate q -plates, with arbitrary integer and fractional q values. This is achieved by encoding spiral phases with opposite sense in each side of the SLM.…”

Section: Methods and Techniquesmentioning

confidence: 99%

“…Alternatively, they can be encoded using spatial light modulators (SLM) 26, 27 . The flexibility provided by SLMs allows the generation of arbitrary q -plates.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vector Beam Polarization State Spectrum Analyzer

Moreno

Davis

Badham

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Also, the q value, which is defined as the changing rate of the principle axes of LCs, remains fixed in the fabrication design and thus these devices are not flexible for use as spatial light modulators (SLMs). More recently, an equivalent system of q-plates was proposed that mimics typical q-plates 18 . This proposed imitated q-plate system has the benefit of leaving out the fabrication of q-plates and thus has more degrees of freedom in the real-time manipulation of light.…”

Section: Introductionmentioning

confidence: 99%

Complex beam shaping based on an equivalent q-plate system and analysis of its properties using digital holography polarization imaging

Yang

Fuh

2017

Sci Rep

View full text Add to dashboard Cite

In this study, we generate various complex beams carrying angular momentum (AM) by using a programmable beam shaping system to mimic typical q-plates. When a circularly polarized wave is incident onto the system, the emerging beam reverses its spin handedness and obtains a spatial phase factor. This phase factor can be engineered by designing a computer-generated hologram (CGH) and applying it to a spatial light modulator (SLM) to produce a beam with controllable spatially distributed orbital angular momentum (OAM) density. To determine the properties of the generated fields, we combine digital holography (DH) with the beam shaping system to yield visualizations of the beam intensity, phase, and AM distributions over the transverse plane at different propagation distances. Comparisons of the theoretically and experimentally obtained results show good qualitative agreement. This study advances our understanding and interpretation of AM characteristics produced by a programmable q-plate-like system.

show abstract

Electrically Active Terahertz Liquid‐Crystal Metasurface for Polarization Vortex Beam Switching

Wang,

Guo,

Chen

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Polarized vortex waves have attracted widespread attention in investigations of light–matter interactions and the augmentation of information capacity owing to their distinctive characteristics. Nevertheless, the reconfigurable generation of vector beams, especially at terahertz (THz) frequencies, remains challenging. In this study, a tunable THz polarization vortex beam generator based on a liquid‐crystal metasurface is proposed. A unit cell featuring reconfigurable linear polarization selectivity is developed. A general methodology for designing metasurfaces to generate customized and reconfigurable polarization patterns is introduced. Furthermore, the electrically tunable generation of polarized patterns and cylinder vector beams is experimentally demonstrated. The findings of this study can open up opportunities for wireless communication and super‐resolution imaging applications.

show abstract

Generation of integer and fractional vector beams with q-plates encoded onto a spatial light modulator

Cited by 54 publications

References 21 publications

Vector Beam Polarization State Spectrum Analyzer

Vector Beam Polarization State Spectrum Analyzer

Complex beam shaping based on an equivalent q-plate system and analysis of its properties using digital holography polarization imaging

Electrically Active Terahertz Liquid‐Crystal Metasurface for Polarization Vortex Beam Switching

Contact Info

Product

Resources

About