Complex-amplitude metasurface-based orbital angular momentum holography in momentum space

Ren, Haoran; Fang, Xinyuan; Jang, Jaehyuck; Bürger, Johannes; Rho, Junsuk; Maier, Stefan A.

doi:10.1038/s41565-020-0768-4

Cited by 551 publications

(365 citation statements)

References 39 publications

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“…For high-resolution 3D nanoprinting, we chose the commercial IP-Dip photoresist that offers a high spatial resolution down to 300 nm. Alternatively, IP-L photoresist with stronger mechanical stability but a reduced spatial resolution of 500 nm can also be used for creating 3D nanopillar-based birefringent metasurfaces 44 , which can potentially extend the metafibre capabilities for controlling the additional degrees of freedom of light, including amplitude, polarization, and orbital angular momentum. A 5 µm-thick base layer was first printed to promote the strong mechanical connection of the lens and fibre surface, followed by the actual printing of the UNM (50 nm hatching, 200 nm slicing, approximate printing time 1 h).…”

Section: Experimental Design and Sample Preparationmentioning

confidence: 99%

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

et al. 2021

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Strong focusing on diffraction-limited spots is essential for many photonic applications and is particularly relevant for optical trapping; however, all currently used approaches fail to simultaneously provide flexible transportation of light, straightforward implementation, compatibility with waveguide circuitry, and strong focusing. Here, we demonstrate the design and 3D nanoprinting of an ultrahigh numerical aperture meta-fibre for highly flexible optical trapping. Taking into account the peculiarities of the fibre environment, we implemented an ultrathin meta-lens on the facet of a modified single-mode optical fibre via direct laser writing, leading to a diffraction-limited focal spot with a record-high numerical aperture of up to NA ≈ 0.9. The unique capabilities of this flexible, cost-effective, bio- and fibre-circuitry-compatible meta-fibre device were demonstrated by optically trapping microbeads and bacteria for the first time with only one single-mode fibre in combination with diffractive optics. Our study highlights the relevance of the unexplored but exciting field of meta-fibre optics to a multitude of fields, such as bioanalytics, quantum technology and life sciences.

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Section: Experimental Design and Sample Preparationmentioning

confidence: 99%

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

et al. 2021

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“…The extremely polarized HEIL offers a mechanism for optical image encryption [ 38–41 ] of security information. As a demonstration, we encoded the Jinan University emblem in the prefabricated Al nanorod array though a bit by bit laser printing manner with a resolution of ≈800 nm.…”

Section: Resultsmentioning

confidence: 99%

Extremely Polarized and Efficient Hot Electron Intraband Luminescence from Aluminum Nanostructures for Nonlinear Optical Encoding

Zhang

Han

Shi

et al. 2020

Laser & Photonics Reviews

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Hot electron intraband luminescence from plasmonic nanostructures is of critical importance for integrated photonic devices and applications in ultracompact nanospectrometer, bioimaging, information encryption et al. Although, the past few decades have witnessed tremendous progress in enhancing the luminescence efficiency of plasmonic nanostructures, the luminescence is usually unpolarized or partially polarized and difficult to be tailored because of its incoherent and broadband feature, significantly limiting its applications. Here the current limitation, demonstrating extremely polarized hot electron intraband luminescence with record‐high degree of linear polarization (≈1) and ≈40 000‐fold enhancement from judiciously designed aluminium (Al) plasmonic nanostructures, is broken through. The designed nanostructures exhibit strong polarization‐dependent anisotropic scattering across the visible band which efficiently modulates the luminescence in orthogonal directions. Leveraging this appealing feature, high‐contrast analyzer controlled optical image encryption and camouflage for information security applications are demonstrated. This research lays the groundwork for integrated nonlinear photonic devices based on complementary metal–oxide–semiconductor (CMOS)‐compatible plasmonic materials and paves the way for ultracompact on‐chip photonic devices demanding polarized white light sources.

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“…Hence, OAM provides a new degree of spatial freedom for the EM‐wave manipulation and the spatial domain resource, which can be utilized as the carrier of information. Recently, OAM holography has been reported in the optical frequency, [ 40–44 ] in which the OAM‐multiplexing holography that superposes OAM of light into metasurface was studied. [ 40–42 ] In addition, OAM‐multiplexing systems based on the polarizations or OAM beams have been investigated at the visible frequencies, [ 43,44 ] but the method simultaneously considering the polarizations and OAM beams has not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

Orbital‐Angular‐Momentum‐Encrypted Holography Based on Coding Information Metasurface

Xiao

Yan

et al. 2021

Advanced Optical Materials

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Metasurface holography has shown great potentials to reconstruct the full‐wave information of electromagnetic (EM) waves, bringing benefits of high spatial resolution and good precision of reconstructed images. To obtain higher security of the metasurface holography, orbital‐angular‐momentum (OAM) of EM waves is taken into consideration as new freedom of the metasurface holography. The use two coding information metasurfaces is proposed to achieve the OAM‐encrypted holography. One metasurface is used to generate different OAM beams with l = ±1 helical mode indices, which functions as the OAM feed; while the other is used to integrate different OAM helical‐phase wavefronts into the holograms of the transmitted images, forming the OAM‐encrypted holography. The predesigned images are accurately decoded only when the OAM‐encrypted metasurface is illuminated by the incident OAM beams with the inverse helical mode indices (l = ∓1) under the incidence of defined polarization states. Experimental results agree well with the theoretical design and numerical simulations, verifying the feasibility and security of the OAM‐encrypted holography. The proposed method will be a good candidate to enhance the secure communication systems and imaging systems.

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Complex-amplitude metasurface-based orbital angular momentum holography in momentum space

Cited by 551 publications

References 39 publications

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

Extremely Polarized and Efficient Hot Electron Intraband Luminescence from Aluminum Nanostructures for Nonlinear Optical Encoding

Orbital‐Angular‐Momentum‐Encrypted Holography Based on Coding Information Metasurface

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