A broadband achromatic metalens array for integral imaging in the visible

Fan, Zhi-Bin; Qiu, Hao-Yang; Zhang, Han‐Le; Pang, Xiaoyan; Zhou, Lidan; Liu, Lin; Hui, Rutai; Wang, Qiong‐Hua; Dong, Jian‐Wen

doi:10.1364/isa.2019.itu4b.4

Cited by 18 publications

(23 citation statements)

References 5 publications

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“…In Figure 12B, GaN nano-posts and its inverse structures are used to realize various phase dispersions [141]. In addition to the aforementioned studies, visible metalenses with silicon nitride [142] or aluminum [144] have also been reported.…”

Section: Continuous-band Metalensesmentioning

confidence: 95%

“…After the demonstration of the broadband metalens with 60 nm bandwidth in the visible regime [139], many studies on broadband metalenses have been conducted in various frequency regimes such as the visible [11,[140][141][142][143][144], infrared [124,[145][146][147], and terahertz regimes [148]. Figures 12A,B show visible broadband metalenses using titanium dioxide (TiO 2 ) and gallium nitride, respectively [11,141].…”

Section: Continuous-band Metalensesmentioning

confidence: 99%

“…Research on applications of metalenses has also been actively conducted in recent years. In the field of display, studies have been conducted using metalens arrays instead of microlens arrays for integral imaging [142] and light-field imaging [143]. In Figure 12E, it can be seen that for light-field imaging, a metalens array can replace a conventional microlens array which has the problem of chromatic aberration.…”

Section: Continuous-band Metalensesmentioning

confidence: 99%

“…For [141], n 1 = 2.41 (GaN), n 2 = 1 (air). For [142], n 1 = 2 (Si 3 N 4 ), n 2 = 1 (air). For [143], n 1 = 2.41 (GaN), n 2 = 1 (air).…”

Section: Continuous-band Metalensesmentioning

confidence: 99%

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Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices

Jung

Park

et al. 2020

Nanophotonics

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AbstractMetamaterials can possess extraordinary properties not readily available in nature. While most of the early metamaterials had narrow frequency bandwidth of operation, many recent works have focused on how to implement exotic properties and functions over broad bandwidth for practical applications. Here, we provide two definitions of broadband operation in terms of effective material properties and device functionality, suitable for describing materials and devices, respectively, and overview existing broadband metamaterial designs in such two categories. Broadband metamaterials with nearly constant effective material properties are discussed in the materials part, and broadband absorbers, lens, and hologram devices based on metamaterials and metasurfaces are discussed in the devices part.

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Section: Continuous-band Metalensesmentioning

confidence: 95%

Section: Continuous-band Metalensesmentioning

confidence: 99%

Section: Continuous-band Metalensesmentioning

confidence: 99%

“…For [141], n 1 = 2.41 (GaN), n 2 = 1 (air). For [142], n 1 = 2 (Si 3 N 4 ), n 2 = 1 (air). For [143], n 1 = 2.41 (GaN), n 2 = 1 (air).…”

Section: Continuous-band Metalensesmentioning

confidence: 99%

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Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices

Jung

Park

et al. 2020

Nanophotonics

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“…To overcome this issue, an achromatic lens can be designed via simultaneously engineering the group delay and the group delay dispersion 75,76 , which will be described in detail later. Other novel and/or improved near-eye display architectures include metasurface-based contact lens-type AR 77 , achromatic metalens array enabled integral-imaging light field displays 78 , wide FoV lightguide AR with polarization-dependent metagratings 79 , and off-axis projection-type AR with an aberration-corrected metasurface combiner [80][81][82] . Nevertheless, from the existing AR/VR prototypes, metasurfaces still face a strong tradeoff between numerical aperture (for metalenses), chromatic aberration, monochromatic aberration, efficiency, aperture size, and fabrication complexity.…”

Section: Metasurfaces and Sgsmentioning

confidence: 99%

Augmented reality and virtual reality displays: emerging technologies and future perspectives

et al. 2021

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With rapid advances in high-speed communication and computation, augmented reality (AR) and virtual reality (VR) are emerging as next-generation display platforms for deeper human-digital interactions. Nonetheless, to simultaneously match the exceptional performance of human vision and keep the near-eye display module compact and lightweight imposes unprecedented challenges on optical engineering. Fortunately, recent progress in holographic optical elements (HOEs) and lithography-enabled devices provide innovative ways to tackle these obstacles in AR and VR that are otherwise difficult with traditional optics. In this review, we begin with introducing the basic structures of AR and VR headsets, and then describing the operation principles of various HOEs and lithography-enabled devices. Their properties are analyzed in detail, including strong selectivity on wavelength and incident angle, and multiplexing ability of volume HOEs, polarization dependency and active switching of liquid crystal HOEs, device fabrication, and properties of micro-LEDs (light-emitting diodes), and large design freedoms of metasurfaces. Afterwards, we discuss how these devices help enhance the AR and VR performance, with detailed description and analysis of some state-of-the-art architectures. Finally, we cast a perspective on potential developments and research directions of these photonic devices for future AR and VR displays.

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Enhanced depth of field of computer‐generated holographic stereograms by twice close‐range capturing with occlusion processing

Dai

Wang

et al. 2021

J Soc Info Display

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In pinhole integral imaging (PII)‐based hologram, each pinhole is regarded as a point light source to emit light rays in different directions to simulate light propagation from the reconstructed 3D information to the computer‐generated hologram (CGH). The PII‐based hologram presents at a working mode similar to resolution‐priority integral imaging (RPII). The depth of field (DOF) is inevitably limited. In this paper, we use twice close‐range capturing to enhance the DOF of this hologram. Twice close‐range capturing can ensure that the virtual objects with different depths are not far from their respective image reference planes, and the detailed information of the back object also can be preserved. Besides, we use a simple ray‐tracing method to solve the occlusion problems. Numerical and optical reconstruction verified that the proposed method can reconstruct clearer 3D images compared with the single capturing method. In addition, the proposed method can present a natural occlusion effect. Thus, the DOF is enhanced.

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A broadband achromatic metalens array for integral imaging in the visible

Cited by 18 publications

References 5 publications

Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices

Broadband metamaterials and metasurfaces: a review from the perspectives of materials and devices

Augmented reality and virtual reality displays: emerging technologies and future perspectives

Enhanced depth of field of computer‐generated holographic stereograms by twice close‐range capturing with occlusion processing

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