Vector beams generated with a Fourier transform processor with geometric phase grating

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

doi:10.1117/1.oe.62.1.013104

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…A linear polarizer (Pol) is added before the spatial filter so the input beam is fully polarized. The key element of the setup is the optical component developed by the company Codixx [20] consisting in two rectangular polarizers placed side by side, one aligned vertically and the other horizontally. Each rectangle has a size of 5 mm  10 mm, with a gap between them slightly less than 0.1 mm.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of polarization diffractive patterned polarizers and retarders

Moreno Soriano,

Marco,

Sánchez-López

et al. 2024

Complex Light and Optical Forces XVIII

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This work presents polarization effects caused by the diffraction by patterned polarizing elements, patterned polarizers or patterned retarders. The Fourier transform and Jones matrix formalism is applied to analyze the diffraction pattern. The approach will be applied to analyze simple diffractive elements and vectorial vortex diffraction gratings, as well as for polarizing Fourier transform systems. Theoretical and computational analysis is completed with experimental results using patterned polarizers and spatial light modulators.

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Section: Resultsmentioning

confidence: 99%

“…The second simple example we consider is a geometric phase polarization diffraction grating consisting of a half-wave retarder where the principal axis rotates periodically with the x coordinate [20]. This diffractive element can be described with the following Jones matrix ,…”

Section: Case 2: Half-wave Retarder Geometric Phase Polarization Diff...mentioning

confidence: 99%

Analysis of polarization diffractive patterned polarizers and retarders

Moreno Soriano,

Marco,

Sánchez-López

et al. 2024

Complex Light and Optical Forces XVIII

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“…Therefore, the relative intensities can be controlled at will simply by controlling the percentage of pixels assigned to each pattern. We recently made use of this property in a Fourier transform processor to control the two orthogonal polarization components of vector beams 19 …”

Section: Experimental System and Methodsmentioning

confidence: 99%

“…We recently made use of this property in a Fourier transform processor to control the two orthogonal polarization components of vector beams. 19 Next we show results in which we increase the number of output patterns.…”

Section: (B)mentioning

confidence: 99%

Multiplexing onto a spatial light modulator using random binary patterns

Davis,

Moreno,

Gao

et al. 2023

Opt. Eng.

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.We introduce an approach for encoding a variety of independent outputs from a computer-generated diffractive optical element displayed on a spatial light modulator (SLM). In this approach, random binary 0-1 orthogonal patterns are multiplied to the different phase functions, effectively multiplexing the corresponding different outputs. We show experimental results with different examples of multiplexed phase functions. Additional functions can be multiplexed simply by adding more random binary patterns. We demonstrate the generation of up to eight different independent outputs. Although the technique was demonstrated years ago, nowadays it can be applied with high-resolution SLMs with a very large number of pixels, thus allowing for a larger number of multiplexed functions without significant degradation. Nevertheless, high-resolution SLMs are affected by pixel crosstalk caused by the fringing field effect. We show that the random patterns are quite sensitive to this effect, leading to a significant undesired DC order. Two alternative strategies to avoid this degradation and make the random multiplexing technique efficient are discussed.

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Dual polarization Fourier transform processor using geometric-phase lenses

García‐Martínez¹,

Moreno²

2023

Opt. Express

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This work presents a novel optical system for polarization image processing using geometric-phase (Pancharatnam-Berry) lenses. Such lenses are half-wave plates where the orientation of the fast (slow) axis follows a quadratic relation with the radial coordinate, and they present the same focal length but opposite sign for left and right circular polarizations. Therefore, they split an input collimated beam in a converging beam and a diverging beam with opposite circular polarizations. This coaxial polarization selectivity introduces a new degree of freedom in optical processing systems and makes it interesting for imaging and filtering applications that require polarization sensitivity. Here we profit from these properties to build an optical Fourier filter system with polarization sensitivity. A telescopic system is used to have access to two real Fourier transform planes, one for each circular polarization. A second symmetric optical system is used to recombine the two beams onto a single final image. As a result, polarization sensitive optical Fourier filtering can be applied, as demonstrated with simple bandpass filters.

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Vector beams generated with a Fourier transform processor with geometric phase grating

Cited by 3 publications

References 21 publications

Analysis of polarization diffractive patterned polarizers and retarders

Analysis of polarization diffractive patterned polarizers and retarders

Multiplexing onto a spatial light modulator using random binary patterns

Dual polarization Fourier transform processor using geometric-phase lenses

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