Holographic Super-Resolution Metalens for Achromatic Sub-Wavelength Focusing

Dai, Xuemei; Dong, Fengzhong; Zhang, Kun; Liao, Dingpeng; Li, Sheng; Shang, Zhengguo; Zhou, Yi; Liang, Gaofeng; Zhang, Zhihai; Wen, Zhongquan; Chen, Gang; Dai, Luru; Chu, Weiguo

doi:10.1021/acsphotonics.1c00411

Cited by 30 publications

(11 citation statements)

References 52 publications

(79 reference statements)

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“…Furthermore, one can seek other approaches to realize achromatic focusing. For example, superoscillation, which is usually utilized for subwavelength super-resolution focusing, has also been reported as a holographic approach for achromatic focusing 114 . A binary amplitude mask is constructed by two sets of PB meta-atom with different sizes but sharing the same rotating regulation.…”

Section: Progress and Challenges For Typical Performancesmentioning

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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Section: Progress and Challenges For Typical Performancesmentioning

confidence: 99%

Dielectric metalens for miniaturized imaging systems: progress and challenges

et al. 2022

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“…Using this feature, the metal halide lamps used in microscopy are usually equipped with elliptical reflectors to generate a concentrated spot of light by embedding the bulb at one focus of the ellipse. However, almost all of the reported planar metalenses, including zone-plate-type [ 23 , 24 , 25 , 26 ], metasurface-type [ 9 , 27 , 28 , 29 , 30 ] and photosieves-type [ 31 , 32 , 33 ], have been of circular symmetric topology, and then lead to isotropic sub-diffraction-limited focal spots in the focal plane, as shown in Figure 1 a. The elliptical configuration has seldom been investigated in the construction of a diffractive lens, due to the complicated field modulation property.…”

Section: Resultsmentioning

confidence: 99%

Elliptical Supercritical Lens for Shaping Sub-Diffractive Transverse Optical Needle

Lei

Wang

et al. 2023

Nanomaterials

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Supercritical lens can create a sub-diffraction-limited focal spot in the far field, providing a promising route for the realization of label-free super-resolution imaging through the point scanning mechanism. However, all of the reported supercritical lenses have circular shape configurations, and produce isotropic sub-diffraction-limited focal spots in the focal plane. Here, we propose and experientially demonstrate a sub-diffraction transverse optical needle by using an elliptical supercritical lens. Through breaking the circular symmetry and introducing ellipticity to the lens, a uniform sub-diffractive transverse optical needle with lateral length and width of 6λ/NA and 0.45λ/NA, respectively, was successfully created in the focal plane. Further, elliptical sector-shape cutting with an optimized apex angle of 60 degrees can lead to suppressed subsidiary focusing for improved uniformity and condensed field intensity of the transverse optical needle. The demonstration of sub-diffractive transverse optical needle with a high aspect ratio (length to width ratio) of 13:1 may find potential applications in line-scanning microscopy for video-rate label-free super-resolution imaging, and also enable advances in the fields from laser manufacturing to optical manipulation.

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“…Moreover, the geometrical shape and refractive index distribution of microlens will lead to strong group delay that cannot be compensated, resulting in significant chromatic aberration in a wide wavelength range which is a important problem in the field of optical fiber imaging [15] . 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] .…”

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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Holographic Super-Resolution Metalens for Achromatic Sub-Wavelength Focusing

Cited by 30 publications

References 52 publications

Dielectric metalens for miniaturized imaging systems: progress and challenges

Dielectric metalens for miniaturized imaging systems: progress and challenges

Elliptical Supercritical Lens for Shaping Sub-Diffractive Transverse Optical Needle

Polarization-insensitive broadband metalens integrated on photonic crystal fiber tip

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