Polarization-Sensitive Patterning of Azopolymer Thin Films Using Multiple Structured Laser Beams

Porfirev, Alexey P.; Хонина, С. Н.; Ivliev, Nikolay; Fomchenkov, Sergey A.; Porfirev, Denis P.; Карпеев, С. В.

doi:10.3390/s23010112

Cited by 7 publications

(11 citation statements)

References 44 publications

(57 reference statements)

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“…In optical data transmission, the results obtained can increase the signal power when the data are encoded in light beams by their polarization, and then the incoming beams are identified by polarizers [ 39 , 40 ]. In addition, the obtained results can be used for processing polarization-sensitive materials [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

Enhancing the Spin Hall Effect of Cylindrically Polarized Beams

Kovalev,

Nalimov,

Kotlyar

2024

Micromachines

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Two linked gear wheels in a micromachine can be simultaneously rotated in opposite directions by using a laser beam that has in its section areas the spin angular momentum (SAM) of the opposite sign. However, for instance, a cylindrical vector beam has zero SAM in the focus. We alter a cylindrical vector beam so as to generate areas in its focus where the SAM is of opposite signs. The first alteration is adding to the cylindrical vector beam a linearly polarized beam. Thus, we study superposition of two rotationally symmetric beams: those with cylindrical and linear polarization. We obtain an expression for the SAM and prove two of its properties. The first property is that changing superposition coefficients does not change the shape of the SAM density distribution, whereas the intensity changes. The second property is that maximal SAM density is achieved when both beams in the superposition have the same energy. The second perturbation is adding a spatial carrier frequency. We study the SAM density of a cylindrical vector beam with a spatial carrier frequency. Due to periodic modulation, upon propagation in space, such a beam is split into two beams, having left and right elliptic polarization. Thus, in the beam transverse section, areas with the spin of different signs are separated in space, which is a manifestation of the spin Hall effect. We demonstrate that such light beams can be generated by metasurfaces, with the transmittance depending periodically on one coordinate.

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Section: Discussionmentioning

confidence: 99%

Enhancing the Spin Hall Effect of Cylindrically Polarized Beams

Kovalev,

Nalimov,

Kotlyar

2024

Micromachines

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“…Polarizing filters make it possible to encode information into incoming light and decode the information using photosensitive materials such as azopolymers. Q-plates are useful for producing linearly polarized laser beams with a variety of polarization orientations, allowing for simultaneous, non-uniform laser patterning of thin azopolymer films [114].…”

Section: Creation Of Structured Beams By Spiral Mass Transportmentioning

confidence: 99%

Generation of Orbital Angular Momentum Light by Patterning Azopolymer Thin Films

Olaleye,

Raposo,

Ribeiro

2023

Photonics

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Orbital angular momentum (OAM) encoding is a promising technique to boost data transmission capacity in optical communications. Most recently, azobenzene films have gained attention as a versatile tool for creating and altering OAM-carrying beams. Unique features of azobenzene films make it possible to control molecular alignment through light-induced isomerization about the azo bond. This feature enables the fabrication of diffractive optical devices such as spiral phase plates and holograms by accurately imprinting a phase profile on the incident light. By forming azobenzene sheets into diffractive optical elements, such as spiral phase plates, one can selectively create OAM-carrying beams. Due to the helical wavefront and phase variation shown by these beams, multiple distinct channels can be encoded within a single optical beam. This can significantly increase the data transmission capacity of optical communication systems with this OAM multiplexing technique. Additionally, holographic optical components made from azobenzene films can be used to build and reconstruct intricate wavefronts. It is possible to create OAM-based holograms by imprinting holographic designs on azobenzene films, which makes it simpler to control and shape optical beams for specific communication requirements. In addition, azobenzene-based materials can then be suitable for integration into optical communication devices because of their reconfigurability, compactness, and infrastructure compatibility, which are the main future perspectives for achieving OAM-based technologies for the next generation, among other factors. In this paper, we see the possible use of azobenzene films in the generation and modification of OAM beams for optical communications through light-induced isomerization. In addition, the potential role of azobenzene films in the development of novel OAM-based devices that paves the way for the realization of high-capacity, OAM-enabled optical communication networks are discussed.

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“…It was previously shown that using two or more interfering beams with specified properties, one can quickly form two-dimensional or three-dimensional diffraction structures in photosensitive materials [14][15][16][17][18][19][20]. Moreover, studies of the influence of the polarization state of various beams on the formation of relief in polarization-sensitive materials are increasingly appearing [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Polarization Distribution and Spin Angular Momentum of the Interference Field Obtained by Co-Planar Beams with Linear and Circular Polarization

Khonina,

Ustinov,

Porfirev

et al. 2024

Photonics

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Interference of two and four light beams with linear or circular polarization is studied analytically and numerically based on the Richards–Wolf formalism. We consider such characteristics of the interference fields as the distribution of intensity, polarization, and spin angular momentum density. The generation of light fields with 1D and 2D periodic structure of both intensity and polarization is demonstrated. We can control the periodic structure both by changing the polarization state of the interfering beams and by changing the numerical aperture of focusing. We consider examples with a basic configuration, as well as those with a certain symmetry in the polarization state of the interfering beams. In some cases, increasing the numerical aperture of the focusing system significantly affects the generated distributions of both intensity and polarization. Experimental results, obtained using a polarization video camera, are in good agreement with the simulation results. The considered light fields can be used in laser processing of thin films of photosensitive (as well as polarization-sensitive) materials in order to create arrays of various ordered nano- and microstructures.

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Polarization-Sensitive Patterning of Azopolymer Thin Films Using Multiple Structured Laser Beams

Cited by 7 publications

References 44 publications

Enhancing the Spin Hall Effect of Cylindrically Polarized Beams

Enhancing the Spin Hall Effect of Cylindrically Polarized Beams

Generation of Orbital Angular Momentum Light by Patterning Azopolymer Thin Films

Analysis of the Polarization Distribution and Spin Angular Momentum of the Interference Field Obtained by Co-Planar Beams with Linear and Circular Polarization

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