Ultra-Thin, Short-Focus, and High-Aperture Metalens for Generating and Detecting Laser Optical Vortices

Nalimov, Anton G.; Kotlyar, V. V.

doi:10.3390/nano12152602

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…As shown in Figure 3ai-hi, the focal ring energy is actually the power of the cross-polarized output field. This arithmetic, P cr ≈ E out x + iσE out y 2 /2 can be written directly in our simulation program [36]. The transmitted electric field data it needs are shown in Figure 3aii-hii.…”

Section: Diagram Of Geometric Phase Nanohole Metasurfacesmentioning

confidence: 99%

Arbitrary-Order and Multichannel Optical Vortices with Simultaneous Amplitude and Phase Modulation on Plasmonic Metasurfaces

et al. 2022

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The highly localized and uneven spatial distribution of the subwavelength light field in metal metasurfaces provides a promising means for the generation of optical vortices (OVs) with arbitrary topological charges. In this paper, a simple and reliable way for generating multichannel OVs on gold nanoporous metasurfaces is reported. The instantaneous field of arbitrary-order OVs can be regulated and concentrated on the same focal surface by adapting photonic spin–orbit interaction (SOI) and geometric phase. The focal ring energy distribution of OVs along the conical propagation path is accurately calculated, and the double phase of units induced by spin rotation is confirmed. Based on the parameter optimization of the nanohole arrangement, the simultaneous amplitude and phase modulation of multichannel OVs has been realized. Furthermore, the average multichannel signal-to-noise ratio exceeds 15 dB, which meets the requirements of high resolution and low crosstalk. Our study obtains broadband and efficient OVs, which can contribute to improving the capacity storage and security of optical information and possess great application prospects in beam shaping, optical tweezers, and communication coding.

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Section: Diagram Of Geometric Phase Nanohole Metasurfacesmentioning

confidence: 99%

Arbitrary-Order and Multichannel Optical Vortices with Simultaneous Amplitude and Phase Modulation on Plasmonic Metasurfaces

et al. 2022

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“…Based on the familiar logpolar transformation, in which log-polar coordinates in the input plane are conformably mapped to Cartesian coordinates in the output plane, another sorting method has been proposed [44][45][46]. Recently, a combined high-aperture metalens is designed and used for simultaneously detecting two OAM states [47]. However, in these methods, the separated OAM states are severely destroyed and cannot be used for further interactions that is necessary in many quantum optical experiments [32,33,[48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Compact and sturdy orbital angular momentum sorter without destroying photon states

Zhang

Kong

Zhang

et al. 2023

J. Opt.

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The orbital angular momentum (OAM) has been widely studied and applied to many scientific fields, especially in optical communication and quantum information. In order to give full play to the high-dimensional characteristics of OAM, separating different OAM states is a fundamental requirement. Here we find a way to introduce the mode dependent phase shift by using Porro prism, design and manufacture a new kind of OAM sorter. Our OAM sorter can separate the OAM states with different topological charges without destroying them. Because it is composed of several linear commonly optical elements, which can be closely pasted together, our OAM sorter is very compact and sturdy. Therefore, our research should have great potential application prospects, especially in the communication protocol based on OAM.

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“…Metalens, as a kind of ultrathin metasurface which is a class of subwavelength planar device composed of manually coded nanoblock arrays, has been widely used in various optical imaging systems [16][17][18][19] . Metalenses control the optical phase by engineering the geometric parameters of surface materials, so as to manipulate the incident wavefront to realize diversified foucing light field [20][21][22][23][24] . Compared with microlens, metalens can not only correct chromatic aberration without using additional optical elements, but also has advantage of easy processing and diffraction-limited light focusing [15] ,making it a more suitable device intergrated on fiber tip in broadband imaging applications.…”

Section: Introductionmentioning

confidence: 99%

Polarization-insensitive broadband metalens integrated on photonic crystal fiber tip

Dai

Wang

Liu

et al. 2023

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

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Fiber-tip lens not only makes the optical system more flexible and compact, but also eliminates complex alignment process, which makes it widely used in the fields of spatial light-fiber coupling, laser direct writing and fiber optic imaging. Compared to traditional glass lens, metalens is easier to be processed and integrated on fiber tip because of its special planar structure and small footprint. Fiber-tip metalens with high efficiency achromatic focusing ability has great application potential in multimode endoscope and other optical fiber imaging systems, so we designed a metalens with Si nanopost array that can achieve broadband focusing in the wavelength range of 1.2μm -1.6μm. For realizing broadband achromatic focusing, it is the crucial to meet the focusing phase and phase dispersion requirements simultaneously. Then we built a library of unit pillars with three kinds of cross-sectional geometries to provide diverse focusing phase (φ) and phase dispersion (δφ) combinations and defined a phase-dispersion space composed of parameters. In order to find the optimal unit pillar at each cell, we regarded the minimum Euclid distance between the points from the library and the target point in the phase-dispersion space as the criterion. Photonic crystal fiber (PCF) is a suitable integration platform for metalens because of the large core diameter and good dispersion property, so the PCF guided mode and plane wave are selected to lunch into the metalens for comparison and verification in the present work. The simulation results demonstrated that the metalens had a good achromatic focusing performance in the target wavelength band and changed little at different polarization of the source, which showed a good polarization-insensitive property.

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Ultra-Thin, Short-Focus, and High-Aperture Metalens for Generating and Detecting Laser Optical Vortices

Cited by 8 publications

References 27 publications

Arbitrary-Order and Multichannel Optical Vortices with Simultaneous Amplitude and Phase Modulation on Plasmonic Metasurfaces

Arbitrary-Order and Multichannel Optical Vortices with Simultaneous Amplitude and Phase Modulation on Plasmonic Metasurfaces

Compact and sturdy orbital angular momentum sorter without destroying photon states

Polarization-insensitive broadband metalens integrated on photonic crystal fiber tip

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