Vacuum Ultraviolet Light-Generating Metasurface

Semmlinger, Michael; Tseng, Ming Lun; Yang, Jian; Zhang, Ming; Zhang, Chao; Tsai, Wen–Yu; Tsai, Din Ping; Nordlander, Peter; Halas, Naomi J.

doi:10.1021/acs.nanolett.8b02346

Cited by 90 publications

(78 citation statements)

References 52 publications

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“…They are part of a class of structures, generally called metasurfaces, which include high impedance surface (HIS), electromagnetic bandgap (EBG), artificial impedance surface (AIS), and so forth. These metasurfaces are relevant to multiple applications for antennas, lenses, absorbers, imaging, and waveguides [27][28][29][30][31][32][33][34]. But, until now, using coding metasurfaces to reduce edge scattering has rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

Feng

Wang

et al. 2020

Front. Phys.

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Edge scattering is one of the main scattering sources for metal objects, especially for those with thin front edges. In this paper, based on the principle of scattering cancelation, a coding metasurface purfle is proposed and employed to suppress the edge back-scattering of electromagnetic (EM) waves. To this end, two split-ring resonators with a π phase difference between them are designed to act as the 0-and 1-element of the coding metasurface. The coding metasurface fixed on the front edge of a thin metal plate can reduce the edge back-scattering significant for EM waves polarized along the edge direction due to the anti-phase scattering of the two coding elements. Both the simulation and experiment results verify the reduced back-scattering of the flat edge. A maximal reduction of 24 dB is attained within the central frequency of about 11 GHz. This work provides a novel alternative to suppressing edge scattering and may find applications in EM compatibility, radar stealth technologies, etc.

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Section: Introductionmentioning

confidence: 99%

Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

Feng

Wang

et al. 2020

Front. Phys.

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“…On the other hand, high energy band gap semiconductors studied so far that are suitable for the NUV-visible range, have reduced or no optical nonlinearities. [24,25] Here, we demonstrate the fabrication and experimental characterization of a new type of nonlinear metasurfaces for the NUV-visible range made of a dielectric material operating with the second-order nonlinearity that originates from the material itself. We propose to use the perovskite metal oxide ferroelectric barium titanate (BaTiO3, BTO).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Nonlinear Yield from Barium Titanate Metasurface Down to the Near Ultraviolet

Timpu

Escalé

Timofeeva

et al. 2019

Advanced Optical Materials

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Metasurfaces are artificial nanopatterned two-dimensional architectures that can offer a solution to the bottleneck problem of bulky optical elements. They have the ability of wavefront shaping and light sub-wavelength manipulation because they are formed of resonantly scattering elements. Recently, the properties of metasurfaces gained interest for nonlinear optics in the efforts to miniaturize nonlinear optical devices while maintaining high photon-photon interactions. Here we develop a new type of nonlinear metasurface based on the metal oxide barium titanate, which demonstrates an efficient nonlinear optical response over a broad spectral range, from near-ultraviolet to the visible range, where metals and semiconductors typically have losses. Contrary to previously demonstrated nonlinear plasmonic metasurfaces, these dielectric metasurfaces are less sensitive to surface roughness and gain their optical nonlinearity from the noncentrosymmetric crystal structure of the ferroelectric barium titanate.

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“…For example, a continuous control over the nonlinear phase change from 0 to 2π is recently realized by changing the size and shape of nanostructures, or rotating the elements with respect to the laboratory frame. Based on these mechanisms, nonlinear planar optical devices have been achieved with simultaneous harmonic generation and wavefront control . However, so far, few works on polarization state control of nonlinear signals produced from nonlinear metasurfaces have been reported.…”

Section: Introductionmentioning

confidence: 99%

Polarization Generation and Manipulation Based on Nonlinear Plasmonic Metasurfaces

Zang

Qin

Yang

et al. 2019

Advanced Optical Materials

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along two orthogonal directions, single type of nanostructures have been tailored to convert linear polarization to circular polarization and even any polarizations through transmission, reflection, or scattering. [25][26][27][28][29] And two basic subunits that produce two orthogonal polarization components have also been applied to a similar metasurface polarization generator. [30,31] Recently, metasurfaces have been reported as various nonlinear light generation platforms [32] and the concept of wavefront control on metasurfaces has been successfully extended to the nonlinear regime. For example, a continuous control over the nonlinear phase change from 0 to 2π is recently realized by changing the size and shape of nanostructures, or rotating the elements with respect to the laboratory frame. Based on these mechanisms, nonlinear planar optical devices have been achieved with simultaneous harmonic generation and wavefront control. [33][34][35][36][37][38][39][40][41][42] However, so far, few works on polarization state control of nonlinear signals produced from nonlinear metasurfaces have been reported. The key issue is to find two orthogonal polarizations of harmonic components and introduce proper phase difference between them.Here, we demonstrate a nonlinear plasmonic metasurface to realize second harmonic generation (SHG) and polarization control of SH simultaneously. Split-ring resonators (SRRs) and complementary split-ring resonators (CSRRs) rotated by 90° are selected to generate orthogonal polarizations of SH components under the same linear polarized fundamental wave (FW), respectively. We find that phase difference and amplitude ratio between SH components can be tailored by adjusting the arm length of SRRs and CSRRs. By introducing spatial offset between adjacent basic supercells, we can achieve phase difference between two orthogonal components and thus realize polarization control of output SH emission and beam splitting at the same time. We then experimentally demonstrate a nonlinear metasurface that can simultaneously generate two separated SH beams with orthogonal circular polarizations under linearly polarized FW and two orthogonal linearly polarized SH beams under circularly polarized FW. Acting like a quarter-wave plate (QWP) in linear regime, the nonlinear metasurface is called an SH quarter-wave plate, which exhibits powerful capability of nonlinear polarization manipulation. Finally, we show various elliptical polarization generations for SH with proper design.Polarization is one of the most important properties of light, which is also a typical dimension for light field manipulation. With specially designed meta-atoms and tailorable phase distribution, metasurfaces have been employed to achieve arbitrary polarization state in linear regime. Moreover, metasurface is also a platform for various types of nonlinear light generation, which can be used to realize an integrated polarized light source combined with its powerful capability of polarization manipulation. Here, a nonlinear plasmonic ...

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Vacuum Ultraviolet Light-Generating Metasurface

Cited by 90 publications

References 52 publications

Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

Enhanced Nonlinear Yield from Barium Titanate Metasurface Down to the Near Ultraviolet

Polarization Generation and Manipulation Based on Nonlinear Plasmonic Metasurfaces

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