Metalens for Generating a Customized Vectorial Focal Curve

Wang, Ruoxing; Intaravanne, Yuttana; Li, Songtao; Han, Jin‐Hee; Chen, Shumei; Liu, Jianlong; Zhang, Shuang; Li, Li; Chen, Xianzhong

doi:10.1021/acs.nanolett.0c04775

Cited by 56 publications

(50 citation statements)

References 44 publications

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“…All the simulated intensity distributions are acquired through the Fresnel−Kirchhoff diffraction integral. [15] The measured patterns are in good agreement with the simulation results, which confirms the superposition of GPVBs. The number of singularities in the superposed beam can be calculated through the relation…”

Section: Resultssupporting

confidence: 80%

Multichannel Superposition of Grafted Perfect Vortex Beams

et al. 2022

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The OV beam can be converted into a doughnut-shaped ring with the transverse component of Poynting vectors. Owing to the azimuthally dependent phase, an OV beam possesses an orbital angular momentum (OAM), which plays a vital role in various applications such as optical communications, [2] optical imaging, [3] particle manipulation, [4] and OAM microlasers. [5] The diameter of the light ring is strongly dependent on the TC, hindering the coupling of multiple OVs in an optical fibre. [6] To solve this problem, Ostrosky et al. proposed the concept of the perfect optical vortex (POV), [7] which exhibits a constant intensity profile and a radius irrespective of the TC. [8,9] For conventional OV and POV beams, the OAM distribution on the ring is uniform. This uniformity is not suitable for applications where versatile OAM distributions are needed, e.g., multiparticle trapping and manipulation. Therefore, noncanonical optical vortices are proposed to tackle these challenges. Examples include spiral OAM distributions, [10] nonuniform hollow circular OAM distributions, [11] and structured OAM distributions. [12] However, these OAM distributions are strongly dependent on the intensity and the local OAM modulation is impossible. A grafted optical vortex, which is generated through grafting two or more spiral phase profiles of optical vortex beams, has a controllable OAM distribution and constant intensity. [13] Recently, grafted perfect vortex beams (GPVBs) have attracted much attention due to their unique optical properties (e.g., versatile OAM distributions) and potential applications (e.g., more options for particle manipulation). However, the generation and manipulation of GPVBs are more challenging and complicated due to the involvement of an additional phase profile of a lens and that of an axicon. The optical setups currently being used for generating GPVBs are complex, requiring numerous optical components, including spatial light modulators, lenses, pinhole filters, polarizers, and dichroic mirrors, [13] which result in large space requirement and high cost. These optical systems are impractical for many applications, and hence there is a pressing requirement for a compact, simple, and efficient approach to generating and manipulating GPVBs.Optical metasurfaces have been used in a range of ultrathin optical devices, including metalenses, [14][15][16][17][18] polarization detectors, [19][20][21] holograms, [22][23][24][25] and high-resolution imaging. [26,27]

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Section: Resultssupporting

confidence: 80%

Multichannel Superposition of Grafted Perfect Vortex Beams

et al. 2022

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“…Benefitting from the high design freedom, metalens is also popular to focus the customized beams such as vortex beams [14][15][16][17][18][19] . The desired phase profile, especially those that are too complicated to be presented by an analytical equation, can be extracted from the simulations, or obtained by numerical strategies such as computergenerated holography methods 20,21 .…”

Section: Phase Profile Designmentioning

confidence: 99%

Dielectric metalens for miniaturized imaging systems: progress and challenges

et al. 2022

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Lightweight, miniaturized optical imaging systems are vastly anticipated in these fields of aerospace exploration, industrial vision, consumer electronics, and medical imaging. However, conventional optical techniques are intricate to downscale as refractive lenses mostly rely on phase accumulation. Metalens, composed of subwavelength nanostructures that locally control light waves, offers a disruptive path for small-scale imaging systems. Recent advances in the design and nanofabrication of dielectric metalenses have led to some high-performance practical optical systems. This review outlines the exciting developments in the aforementioned area whilst highlighting the challenges of using dielectric metalenses to replace conventional optics in miniature optical systems. After a brief introduction to the fundamental physics of dielectric metalenses, the progress and challenges in terms of the typical performances are introduced. The supplementary discussion on the common challenges hindering further development is also presented, including the limitations of the conventional design methods, difficulties in scaling up, and device integration. Furthermore, the potential approaches to address the existing challenges are also deliberated.

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“…Emerging optical metasurfaces have provided unprecedented capabilities to locally manipulate light's phase, amplitude, and polarization at subwavelength scale, leading to the development of novel metasurface devices, including metalenses, [13][14][15][16] multifunctional devices, [17][18][19][20][21] polarization-sensitive holograms, [22][23][24][25] vortex beam generators, [26][27][28][29][30] and polarization structure generation. [31][32][33] The ultrathin nature of metasurfaces makes them desirable for miniaturization and integration.…”

Section: Introductionmentioning

confidence: 99%