Multifunctional metalens generation using bilayer all-dielectric metasurfaces

Chen, Li; Hao, Yuan; Zhao, Lin; Wu, Ruihuan; Liu, Yue; Wei, Zhongchao; Xu, Ning; Li, Zhaotang; Liu, Hongzhan

doi:10.1364/oe.420003

Cited by 41 publications

(14 citation statements)

References 45 publications

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“…They have already been applied in many applications, particularly in metalenses 2,3 , holograms [4][5][6] , vortex beam generators [7][8][9] and so on. Metalenses with multi-foci are practically useful [10][11][12][13] due to their ultrathin configuration that can be integrated into miniature optical systems for multiple functions, and by far a group of multifocal metalenses have been reported [14][15][16][17][18][19][20] . Free control and continuous zooming of each foci from multifocal metalenses are of important use in realistic applications, and we propose a tunable bifocal metalens (TBML) in this study, with two continuous-zoom foci is proposed as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Continuous-zoom bifocal metalens at visible wavelength

Wang¹,

Zhang

Yu³

et al. 2023

Optoelectronic Imaging and Multimedia Technology IX

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Metasurfaces and metalenses have drawn great attentions since they can manipulate wavefront versatilely with a miniaturized and ultrathin configuration. Here we propose and numerically verify a tunable bifocal metalens with two continuous-zoom foci. This device utilizes two cascaded and circle layers of metasurfaces with different phase distributions for incidences of opposite helicities imparted on each layer by the combination of geometric phase and propagation phase. By relative rotation of both layers, focal lengths of both foci can be tuned continuously with the zoom range for each focus designed deliberately, and the relative intensity of both foci can be adjusted by changing the polarization state of incidence. The proposed device is anticipated to be applied in polarization imaging, depth estimation, multi-plane imaging, optical data storage, and so on.

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Section: Introductionmentioning

confidence: 99%

Continuous-zoom bifocal metalens at visible wavelength

Wang¹,

Zhang

Yu³

et al. 2023

Optoelectronic Imaging and Multimedia Technology IX

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“…To date, most of the reported bilayer dielectric metasurfaces were demonstrated for operation in the near-infrared region and much of the effort were mainly devoted to monochromatic aberration correction, [33][34][35] multiwavelength control, [36][37][38] and light path or polarization control, [39][40][41][42] among others. [43][44][45] However, their potential in full-space light control remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Polarization‐Filtering Metasurface Doublet for Trifunctional Control of Full‐Space Visible Light

Gao

Zhou

Liu

et al. 2022

Laser & Photonics Reviews

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Multilayered plasmonic metasurfaces have been previously shown to enable multifunctional control of full‐space electromagnetic waves, which are of great importance to the development of compact optical systems. While this structural configuration is practical for acquiring metasurfaces working in microwave frequency, it will inevitably become lossy and highly challenging to fabricate when entering the visible band. Here, an efficient yet facile approach to address this issue by resorting to a dielectric metasurface doublet (DMD) based on two vertically integrated polarization‐filtering meta‐atoms (PFMs) is presented. The PFMs exhibit polarization‐dependent high transmission and reflection, as well as independent and full 2π phase control characteristics, empowering the DMD to realize three distinct incidence‐direction and polarization‐triggered wavefront‐shaping functionalities, including anomalous beam deflection, light focusing, vortex beam generation, and holographic image projection as it is investigated either numerically or experimentally. The presented DMD undoubtedly holds several salient features compared with the multilayered metallic metasurfaces in aspects of design complexity, efficiency, and fabrication. Furthermore, as dielectric meta‐atoms with distinct polarization responses can be deployed to construct the DMD, it is anticipated that diverse full‐space metasurfaces equipped with versatile functionalities can be demonstrated in the future, which will greatly advance the development of multifunctional meta‐optics.

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“…So far, there have been several ways to achieve this. The relative intensity ratio of the two focal points can be adjusted by varying the size of the unit dimensions [48], changing the crystalline fraction of the phase change material [49], and controlling the diversity of the incident beam helicity [50]. The bilayer metalens designed in this paper can utilize different crystalline fractions of phase change materials to achieve continuous zooming of the focus and can also control the intensity contrast of the bifocals by changing the phase difference between a pair of orthogonally polarized incident waves.…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared Continuous Varifocal Metalens with Adjustable Intensity Based on Phase Change Materials

et al. 2022

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Metalenses can greatly reduce the complexity of imaging systems due to their small size and light weight and also provide a platform for the realization of multifunctional imaging devices. Achieving dynamic focus length tunability is highly important for metalens research. In this paper, based on single-crystal Ge and a new low-loss phase change material Ge2Sb2Se5 (GSSe), a tunable metalens formed by a double-layer metasurface composite was realized in the mid-infrared band. The first-layer metasurface formed by Ge nanopillars combines propagation and the geometric phase (equivalent to a half-wave plate function) to produce single- or multiple-polarization-dependent foci. The second-layer metasurface formed by GSSe nanopillars provides a tunable propagation phase, and the double-layer metalens can achieve the tunability of the focus length depending on the different crystalline fractions of GSSe. The focal length varies from 62.91 to 67.13 μm under right circularly polarized light incidence and from 33.84 to 36.66 μm under left circularly polarized light incidence. Despite the difference in the crystallographic fraction, the metalens’s focusing efficiency is maintained basically around 59% and 48% when zooming under RCP and LCP wave excitation. Meanwhile, the incident wave’s ellipticity can be changed to alter the relative intensity ratios of the bifocals from 0.03 to 4.26. This continuous varifocal metalens with adjustable intensity may have potential in practical applications such as optical tomography, multiple imaging, and systems of optical communication.

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Multifunctional metalens generation using bilayer all-dielectric metasurfaces

Cited by 41 publications

References 45 publications

Continuous-zoom bifocal metalens at visible wavelength

Continuous-zoom bifocal metalens at visible wavelength

Dielectric Polarization‐Filtering Metasurface Doublet for Trifunctional Control of Full‐Space Visible Light

Mid-Infrared Continuous Varifocal Metalens with Adjustable Intensity Based on Phase Change Materials

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