Highly anisotropic metasurface: a polarized beam splitter and hologram

Zheng, Jian; Ye, Zhicheng; Sun, Nanling; Zhang, Rui; Sheng, Zheng-Ming; Shieh, Han–Ping D.; Zhang, Jie

doi:10.1038/srep06491

Cited by 53 publications

(33 citation statements)

References 30 publications

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“…Own to the powerful wave manipulation abilities and planar characteristics, metasurface possesses special advantages compared with traditional optical devices, such as low profile, easy fabrication, and integration. In recent years, singular electromagnetic properties have been realized by metasurface, including anomalous reflection/refraction, flat lens, plasmonic lithography, high‐resolution imaging, vortex beam generation, and computer‐generated holograms . Among these, the metalenses are the indispensable elements in the design of the functional optical devices .…”

Section: Introductionmentioning

confidence: 99%

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Cheng

Wei

Fan

et al. 2019

Advanced Optical Materials

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Metasurfaces with locally controlled phase discontinuity are promising for novel manipulations of the optical fields. However, the high insert loss at off‐resonance frequencies and narrow operation band of the resonant metasurface lead to the common low efficiency, obstructing it from practical applications. Here, it is shown that a broadband transparent metasurface, made of three‐layer complementary square ring resonator (CSRR) arrays, can be employed for high‐efficiency and broadband beam manipulation. The nonuniform metasurface can be optimized with high transmittance (above 90%) while maintaining full range (from 0 to 2π) phase modulation by adjusting the geometric parameters of the CSRR on the middle layer. The physical insight can be understood with a coupled oscillator model, it is found that the interlayer coupling constant is the key factor to realize phase modulation with high efficiency. A transmittance metalens with long focal depth in broadband is experimentally demonstrated as an example, the measured transmission efficiency is higher than 80%. The developed broadband wavefront engineering elements can be employed for high‐performance, miniaturized and superior environmental suitability sensing, imaging, and communication system.

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Section: Introductionmentioning

confidence: 99%

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Cheng

Wei

Fan

et al. 2019

Advanced Optical Materials

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“…The devices based on PSC have the advantages of longer lifetime, thinner dimension, better performance than the conventional types, which can be widely used in displays, anti‐counterfeiting, and image sensors . Generally, the functions of metallic nanoarrays are realized by the following three mechanisms: 1) the localized surface plasmon resonance in metallic nanounits, which leads to absorption dips in the transmission or reflection; 2) the surface plasmon spoofed by the nanoarrays, which lead to extraordinary transmission through dielectric apertures below diffraction limits; 3) the plasmonic waveguiding of dielectric slits, which supports broadband polarized transmission of transverse magnetic (TM) light, while prohibits the propagation of transverse electric (TE) light . Utilizing these mechanisms, the spectra of metallic nanoarray can be flexibly tuned to meet a variety of applications by engineering the metal thickness, profile of the unit cells, and the period.…”

Section: Introductionmentioning

confidence: 99%

Highly Tunable Polarized Chromatic Plasmonic Films Based on Subwavelength Grating Templates

Zheng

Wang

et al. 2019

Adv Materials Technologies

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by the nanoarrays, which lead to extraordinary transmission through dielectric apertures below diffraction limits [13,14] ; 3) the plasmonic waveguiding of dielectric slits, which supports broadband polarized transmission of transverse magnetic (TM) light, while prohibits the propagation of transverse electric (TE) light. [15] Utilizing these mechanisms, the spectra of metallic nanoarray can be flexibly tuned to meet a variety of applications by engineering the metal thickness, profile of the unit cells, and the period. For example, by tailoring the profile of the nanounit cell to be asymmetric (linear, elliptical, or rectangular), polarization-dependent tunability can be imposed on the PSC to make integrated colorfilters and polarizers [16,17] for more compact and lower power-consumption liquid crystal displays (LCDs). Recently, actively tunable PSCs based on elastomeric substrates have been reported. By stretching the substrates, the pitch and therefore scattering colors of PSCs can be modified in a wide range, which makes them promising as novel display devices. [18] Besides the structure, the permittivity of the metal materials also strongly affects the spectrum characteristics. For instance, with small damping factors, gold and silver metallic nanoarrays have sharp surface plasmon resonance dips that are suitable for high figure of merit biosensing. [19] While aluminum (Al) has a large absolute value of complex permittivity and a large plasmon frequency to maintain plasmonic characteristics at wavelength down to ultraviolet, thus it is suitable to make broadband nanowire polarizers with high extinction ratio of TM over TE light in the transmission. In addition, Al has been widely used in the packaging, decoration, and laser hologram tags to enhance the reflection of diffraction gratings. [19][20][21] In this work, we propose a kind of transmission films of 1D metallic nanowire gratings (MNGs), which show polarization-dependent PSC over broad spectrum. Such films can be used as a new type of high-security and more recognizable anti-counterfeiting tags: polarized chromatic plasmonic tags (PCPTs). The physical mechanisms responsible for the polarization-dependent chromaticity are revealed, which are used in the device design. In Section 2, the fabrication of the films and tags is presented and their transmission spectra are described as a function of the MNG parameters and incident light parameters. In Section 3, a physical model is presented to describe the polarization-dependent chromaticity. The paper concludes with a summary in Section 4.A kind of polarized chromatic plasmonic film is proposed based on subwavelength grating structure, which enables "blue transmission" for the transverse electric light and "red transmission" for the transverse magnetic light. Metal-insulator-metal plasmonic waveguiding and metallic nanowire scattering are revealed to be responsible for the chromatic shift. Based upon the unique transmission spectrum characteristics of such films, polarized chromatic plasmonic tags (PCPTs) ca...

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“…Metasurfaces are better than bulky optical counterparts, which are designed by rigid refractive index shaping methods. Significant examples of metasurfaces applications include polarization splitting, detection, generation and beam steering [1][2][3][4][5][6] ; waveplates [7][8][9][10] ; focusing along with polarization control [11][12] ; holograms [13][14][15] ; and color printing [16][17] to mention a few 18 .…”

Section: Introductionmentioning

confidence: 99%

Near-field phase characterization of gradient gap plasmon-based metasurfaces

Deshpande¹,

Zenin²,

Ding³

et al. 2018

Metamaterials XI

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Metasurface studies have demonstrated vast applications to control optical properties of light based on the ability to design unit cells with desired phase and reflectivity in 2D subwavelength periodic arrays. The simplified design strategy is only an approximation since the unit cells can be subject to near-field coupling effects due to influence from neighbor unit cells. In this work, we try to investigate this effect by numerically and experimentally studying the near-field response from gold nanobricks of varied length, fabricated in both quasi-periodic and periodic configuration on top of dielectric-coated (SiO2) layer and gold layer at telecommunication wavelength (1500 nm), which is the commonly used gap plasmon configuration for efficient metasurfaces. The experimental near-field investigation is performed using a phase-resolved scattering-type scanning near-field optical microscopy (s-SNOM) in the transmission mode. We demonstrate that near-field coupling becomes significant when edge-to-edge separation between GSP elements goes below ~200-250 nm. We also show that the reflection phase of any GSP element is approximately equal to its doubled near-field phase. Thus, our studies provide a direct explanation of a reduced performance of a densely-packed GSP metasurfaces. This technique can accurately predict the performance of different types of metasurfaces by observing their near-field response in different periodic configurations by considering factors ignored in the design stage, which include fabrication uncertainties, wrong design considerations along with near-field coupling effects.

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Highly anisotropic metasurface: a polarized beam splitter and hologram

Cited by 53 publications

References 30 publications

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Highly Tunable Polarized Chromatic Plasmonic Films Based on Subwavelength Grating Templates

Near-field phase characterization of gradient gap plasmon-based metasurfaces

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