Multispectral metasurface hologram at millimeter wavelengths.
Nicholas W. Caira,David R. Smith +1 more
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TLDR
A computer-generated metasurface hologram in which four distinct images are encoded at four different W-band (75-110 GHz) frequencies is demonstrated, which is optimized using the Gerschberg-Saxton algorithm.Abstract:
We demonstrate a computer-generated metasurface hologram in which four distinct images are encoded at four different W-band (75–110 GHz) frequencies. The metasurface hologram consists of a planar array of resonant metamaterial elements excited by a collimated reference beam incident on the hologram at an oblique angle. Each of the images is encoded by a subset of metamaterial elements that are resonant at the specific excitation frequency and are spatially positioned to achieve a desired phase distribution in the plane in conjunction with the reference wave. The phase-only hologram is optimized using the Gerschberg–Saxton algorithm. The four well-defined images are produced at specific distances within the Fresnel zone of the aperture.read more
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Multi-focus hologram utilizing Pancharatnam-Berry phase elements based metamirror
Yue Wang,Chunsheng Guan,Xumin Ding,Kuang Zhang,Badreddine Ratni,Shah Nawaz Burokur,Xuemai Gu,Qun Wu +7 more
TL;DR: An ultrathin reflection-type metamirror is proposed for multi-focusing with any desired focusing fashion including focal number and location, which provides a high-performance solution for low-cost and lightweight beam-shaping and beam-f focusing devices.
Journal ArticleDOI
Frequency-multiplexed pure-phase microwave meta-holograms using bi-spectral 2-bit coding metasurfaces
TL;DR: A dual-band reflective meta-hologram is designed providing two distinct information channels whose field intensity distributions can be independently manipulated at the same time, and its performance overcomes that of previous studies due to providing two information channels rather than the conventional single-channel holography.
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Real-time terahertz meta-cryptography using polarization-multiplexed graphene-based computer-generated holograms
TL;DR: Based on the polarization multiplicity and re-writability of a computer-generated meta-hologram, a fully secure communication protocol is elaborately developed at the terahertz spectrum to host unique merits for exploring real-time metasurface-based cryptography (meta-cryptography) where highly restricted access of information is imposed.
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Reconfigurable Multifunctional Metasurface Hybridized with Vanadium Dioxide at Terahertz Frequencies
TL;DR: The proposed metasurface holds potential for electromagnetic wave manipulation and this study can motivate the realization of the wideband multifunctional metAsurface and the software-driven reconfigurable metasURface at terahertz frequencies.
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Single-Layer Metasurfaces as Spectrally Tunable Terahertz Half- and Quarter-Waveplates.
TL;DR: A single-layer terahertz metasurface that acts as an efficient teraHertz waveplate, providing phase retardation of up to 180° with a tunable operation frequency and extraordinarily strong hyperbolicity that is closely associated with the distance between resonators, enabling both significantphase retardation and spectral tunability through mechanical deformation.
References
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A practical algorithm for the determination of phase from image and diffraction plane pictures
TL;DR: In this article, an algorithm is presented for the rapid solution of the phase of the complete wave function whose intensity in the diffraction and imaging planes of an imaging system are known.
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Flat Optics With Designer Metasurfaces
Nanfang Yu,Federico Capasso +1 more
TL;DR: This Review focuses on recent developments on flat, ultrathin optical components dubbed 'metasurfaces' that produce abrupt changes over the scale of the free-space wavelength in the phase, amplitude and/or polarization of a light beam.
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Metasurface holograms reaching 80% efficiency
TL;DR: The design of the hologram integrates a ground metal plane with a geometric metasurface that enhances the conversion efficiency between the two circular polarization states, leading to high diffraction efficiency without complicating the fabrication process.
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Metamaterial Huygens' surfaces: tailoring wave fronts with reflectionless sheets.
Carl Pfeiffer,Anthony Grbic +1 more
TL;DR: Huygens' principle is applied to develop designer surfaces that provide extreme control of electromagnetic wave fronts across electrically thin layers to find a wide range of applications over the entire electromagnetic spectrum including single-surface lenses, polarization controlling devices, stealth technologies, and perfect absorbers.
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Metasurface holograms for visible light
TL;DR: Ni et al. as discussed by the authors presented ultra-thin plasmonic holograms that control amplitude and phase in the visible region and are just 30 nm thick, which is comparable to the light wavelength used.