An achromatic metalens in the near-infrared region with an array based on a single nano-rod unit

Yu, Binbin; Wen, Jing; Xu, Chen; Zhang, Dawei

doi:10.7567/1882-0786/ab34c4

Cited by 27 publications

(31 citation statements)

References 34 publications

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“…Our metasurface is based on the Pancharatnam-Berry (PB) phase method, for which the local phase of each unit cell is controlled by the rotation angle of the element. The incident circularly polarized light can be partly converted into inversed circularly polarized light that has the geometric phase according to the PB phase method [30][31][32][33][34]. Figure 2C shows a side view of the metasurface consisting of GaN nanopillars with length L = 250 nm, width W = 80 nm, height H = 600 nm, and pitch P = 280 nm.…”

Section: Theory and Methodsmentioning

confidence: 99%

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

2020

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AbstractLattice light-sheet microscopy (LLSM) was developed for long-term live-cell imaging with ultra-fine three-dimensional (3D) spatial resolution, high temporal resolution, and low photo-toxicity by illuminating the sample with a thin lattice-like light-sheet. Currently available schemes for generating thin lattice light-sheets often require complex optical designs. Meanwhile, limited by the bulky objective lens and optical components, the light throughput of existing LLSM systems is rather low. To circumvent the above problems, we utilize a dielectric metasurface of a single footprint to replace the conventional illumination modules used in the conventional LLSM and generate a lattice light-sheet with a ~3-fold broader illumination area and a significantly leveraged illumination efficiency, which consequently leads to a larger field of view with a higher temporal resolution at no extra cost of the spatial resolution. We demonstrate that the metasurface can manipulate spatial frequencies of an input laser beam in orthogonal directions independently to break the trade-off between the field of view and illumination efficiency of the lattice light-sheet. Compared to the conventional LLSM, our metasurface module serving as an ultra-compact illumination component for LLSM at an ease will potentially enable a finer spatial resolution with a larger numerical-aperture detection objective lens.

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Section: Theory and Methodsmentioning

confidence: 99%

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

2020

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“…A significant reason for this is the lack of available materials, since most optical materials (e.g., silicon and silicate glasses) are opaque in the LWIR regime. In addition, most achromatic metasurfaces take the form of high-refractive-index material patterns at wavelength-scale heights on low-refractive-index substrates [13,[37][38][39][40]. However, depositing wavelength-thickness high-refractive-index films in the LWIR range is challenging owing to quality issues and material stress.…”

Section: Introductionmentioning

confidence: 99%

Broadband Achromatic Metasurfaces for Longwave Infrared Applications

Song

Shan

et al. 2021

Nanomaterials

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Longwave infrared (LWIR) optics are essential for several technologies, such as thermal imaging and wireless communication, but their development is hindered by their bulk and high fabrication costs. Metasurfaces have recently emerged as powerful platforms for LWIR integrated optics; however, conventional metasurfaces are highly chromatic, which adversely affects their performance in broadband applications. In this work, the chromatic dispersion properties of metasurfaces are analyzed via ray tracing, and a general method for correcting chromatic aberrations of metasurfaces is presented. By combining the dynamic and geometric phases, the desired group delay and phase profiles are imparted to the metasurfaces simultaneously, resulting in good achromatic performance. Two broadband achromatic metasurfaces based on all-germanium platforms are demonstrated in the LWIR : a broadband achromatic metalens with a numerical aperture of 0.32, an average intensity efficiency of 31%, and a Strehl ratio above 0.8 from 9.6 μm to 11.6 μm, and a broadband achromatic metasurface grating with a constant deflection angle of 30° from 9.6 μm to 11.6 μm. Compared with state-of-the-art chromatic-aberration-restricted LWIR metasurfaces, this work represents a substantial advance and brings the field a step closer to practical applications.

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“…As 2D ultrathin nano‐devices, optical metasurfaces enable flexible and multifunctional manipulation of the amplitudes, phases, and polarization states of the incident waves, which reveals an emerging research direction. [ 14–33 ] Thus, except for the above‐mentioned SLM‐based conventional method, [ 11 ] some pioneering studies have unveiled metallic [ 2,28 ] and dielectric [ 21,31,33 ] metasurfaces to generate accelerating optical beams. Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

Use of Dielectric Metasurfaces to Generate Deep‐Subwavelength Nondiffractive Bessel‐Like Beams with Arbitrary Trajectories and Ultralarge Deflection

Wen

Chen

et al. 2021

Laser & Photonics Reviews

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For decades, accelerating beams have attracted considerable interest in fundamental physics and in various emerging applications. However, not only are conventional accelerating beam generators (such as spatial light modulators) bulky and diffraction‐inefficient, they also have a poorly resolved ability of phase manipulation that limits the accelerating beam's minimum size and maximum degree of curvature. In this study, a dielectric metasurface is used to generate highly focused nondiffractive Bessel‐like accelerating beams with predefined arbitrary trajectories within a broadband spectral range of 550–710 nm. In particular, a similar metasurface with a combined phase profile allows the generation of a Bessel‐like vortex beam with an ultrahigh numerical aperture of 0.79, resulting in a subwavelength beamwidth of 234 nm (≈0.43λ) down to the diffraction limit. In addition, various accelerating Bessel‐like beams and beam arrays with different predefined trajectories and characteristic beam parameters that are not otherwise achievable with conventional spatial light modulators are demonstrated with synthetic‐phase metasurfaces. This study promotes the diversity of Bessel‐like accelerating beams for practical applications in fields such as optical manipulation, optical storage, biomedical imaging, and material processing.

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An achromatic metalens in the near-infrared region with an array based on a single nano-rod unit

Cited by 27 publications

References 34 publications

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

Broadband Achromatic Metasurfaces for Longwave Infrared Applications

Use of Dielectric Metasurfaces to Generate Deep‐Subwavelength Nondiffractive Bessel‐Like Beams with Arbitrary Trajectories and Ultralarge Deflection

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