Plasmonics metalens independent from the incident polarizations

Wang, Wei; Guo, Zhongyi; Li, Rongzhen; Zhang, Jingran; Li, Yan; Liu, Yi; Wang, Xinshun; Qu, Shiliang

doi:10.1364/oe.23.016782

Cited by 53 publications

(32 citation statements)

References 29 publications

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“…In fact, the metasurfaces are always dispersive, which means that their focal lengths always vary as frequency changes 8, 11, 13, 14, 17, 24, 30 . Meanwhile, it should be noted that the focal points are always moved away from the metasurface with the increase of frequency 8, 11, 13, 14, 17, 24, 30 , which is referred here as a normal-dispersion metasurface. This phenomenon can be understood by the relationship between the desired phase and focus-shift range along the z axis as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Flat Terahertz Reflective Focusing Metasurface with Scanning Ability

Chen

et al. 2017

Sci Rep

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The ability to manipulate the propagation properties of electromagnetic waves, e.g., divergence, focusing, holography or deflection, is very significant in terahertz applications. Metasurfaces with flat structures are attractive for achieving such manipulations in terahertz band, as they feature low profile, lightweight, and ease of design and installation. Several types of terahertz reflective or transmitting metasurfaces with focusing function have been implemented recently, but none of them can provide scanning ability with controllable focus. Here, a flat reflective metasurface featuring controllable focal shift is proposed and experimentally demonstrated. Furthermore, the principle of designing a focus scanning reflective metasurface is presented and the focusing characteristics are discussed, including focus scanning along a line parallel or orthogonal to the metasurface with a large bandwidth. These interesting properties indicate that this flat reflective metasurface could play a key role in many terahertz imaging and detection systems.

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Section: Resultsmentioning

confidence: 99%

“…However, among all the methods for focus scanning, the time-consuming and complicated mechanical ones 22–24 are still dominant in the THz region. In the microwave region, the fast scanning of antenna arrays can be realized using the phased array technique 25, 26 .…”

Section: Introductionmentioning

confidence: 99%

Flat Terahertz Reflective Focusing Metasurface with Scanning Ability

Chen

et al. 2017

Sci Rep

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“…For example, a spindependent metasurface lens can be fabricated with an orientation of the structures with quadratic profile. Such a lens can be switched from a focusing to a diverging lens simply by changing the incident light from one spin to another [131][132][133]. To achieve more generic applications, a holographic approach was proposed to generate a desired complex wave-front, which is flexible enough to realize either a 2D or 3D hologram [134].…”

Section: Geometric Phase Enabled Planar Lens and Hologramsmentioning

confidence: 99%

Spin-dependent optics with metasurfaces

et al. 2016

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Optical spin-Hall effect (OSHE) is a spindependent transportation phenomenon of light as an analogy to its counterpart in condensed matter physics. Although being predicted and observed for decades, this effect has recently attracted enormous interests due to the development of metamaterials and metasurfaces, which can provide us tailor-made control of the light-matter interaction and spin-orbit interaction. In parallel to the developments of OSHE, metasurface gives us opportunities to manipulate OSHE in achieving a stronger response, a higher efficiency, a higher resolution, or more degrees of freedom in controlling the wave front. Here, we give an overview of the OSHE based on metasurface-enabled geometric phases in different kinds of configurational spaces and their applications on spin-dependent beam steering, focusing, holograms, structured light generation, and detection. These developments mark the beginning of a new era of spin-enabled optics for future optical components.

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“…And many efforts have also been made to explain the unique phenomena of EOT, and the existence of the surface plasmon resonance (SPR) and cavity mode (CM) [9,10] have been considered. The SPR and CM can be supported by various metal nano-array [11][12][13], and the resonant spectra of the SPR and CM sensitively vary with the geometric parameters and the environmental refractive index (RI) around the structures. Therefore, the properties of these EOT resonances induced by the SPR and CM can allow a label-free optical sensing.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency refractive index sensor based on the metallic nanoslit arrays with gain-assisted materials

Luo

Tao

et al. 2016

Nanophotonics

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Abstract:We have designed and investigated a three-band refractive index (RI) sensor in the range of 550-900 nm based on the metal nanoslit array with gain-assisted materials. The underlying mechanism of the three-band and enhanced characteristics of the metal nanoslit array with gain-assisted materials, have also been investigated theoretically and numerically. Three resonant peaks in transmission spectra are deemed to be in different plasmonic resonant modes in the metal nanoslit array, which leads to different responses for the plasmonic sensor. By embedding the structure into the CYTOP with proper gain-assisted materials, the sensing performances can be greatly enhanced due to a dramatic amplification of the extraordinary optical transmission (EOT) resonance by the gain medium. When the gain values reach their corresponding thresholds for the three plasmonic modes, the ultrahigh sensitivities in three bands can be obtained, and especially for the second resonant wavelength (λ 2 ), the FOM=128.1 and FOM*= 39100 can be attained at the gain threshold of k =0.011. Due to these unique features, the designing scheme of the proposed gain-assisted nanoslit sensor could provide a powerful approach to optimize the

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Plasmonics metalens independent from the incident polarizations

Cited by 53 publications

References 29 publications

Flat Terahertz Reflective Focusing Metasurface with Scanning Ability

Flat Terahertz Reflective Focusing Metasurface with Scanning Ability

Spin-dependent optics with metasurfaces

High-efficiency refractive index sensor based on the metallic nanoslit arrays with gain-assisted materials

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