Spatial Coherence Manipulation on the Disorder-Engineered Statistical Photonic Platform

Liu, Leixin; Liu, Wenwei; Wang, Fei; Cheng, Hua; Choi, Duk‐Yong; Tian, Jianguo; Cai, Yangjian; Chen, Shuqi

doi:10.1021/acs.nanolett.2c02115

Cited by 15 publications

(7 citation statements)

References 42 publications

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“…One can continuously modulate the scattering phase of a metasurface, and different values of phase are not orthogonal. Recently, researchers have developed spatial coherence as another optical dimension manipulated through metasurfaces, [ 70 ] which also leads to a non‐orthogonal system. Another type of optical manipulation is based on the orthogonal basis.…”

Section: Fundamentals and Principles: Resonances Arrays And Optical D...mentioning

confidence: 99%

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Design Strategies and Applications of Dimensional Optical Field Manipulation Based on Metasurfaces

Liu

Ansari

et al. 2023

Advanced Materials

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Recent rapid progress in metasurfaces is underpinned by the physics of local and nonlocal resonances and the modes coupling among them, leading to tremendous applications such as optical switching, information transmission, and sensing. In this review paper, an overview of the recent advances in a broad range of dimensional optical field manipulation based on metasurfaces categorized into different classes based on design strategies is provided. This review starts from the near‐field optical resonances of artificial nanostructures and discusses the far‐field optical wave manipulation based on fundamental mechanisms such as mode generation and mode coupling. The recent advances in optical field manipulation based on metasurfaces in different optical dimensions such as phase and polarization are summarized, and newly‐developed dimensions such as the orbital angular momentum and the coherence dimensions resulting from phase modulation are discussed. Then, the recent achievements of multiplexing and multifunctional metasurfaces empowered by multidimensional optical field manipulation for optical information transmission and integrated applications are reviewed. Finally, the paper concludes with a few perspectives on emerging trends, possible directions, and existing challenges in this fast‐developing field.

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Section: Fundamentals and Principles: Resonances Arrays And Optical D...mentioning

confidence: 99%

Section: Optical Manipulation In Phase‐based Multidimensionsmentioning

confidence: 99%

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Design Strategies and Applications of Dimensional Optical Field Manipulation Based on Metasurfaces

Liu

Ansari

et al. 2023

Advanced Materials

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“…[9][10][11][12][13] There are abundant achievements in the study of phase [14][15][16][17][18][19][20] and amplitude [21][22][23][24][25] modulation by metasurfaces. Compared with phase-or amplitude-only meta-elements, [26][27][28][29][30][31][32][33] complex-amplitude meta-elements have attracted extensive interest due to their ability to independently and flexibly manipulate the two important optical parameters, i.e., amplitude and phase. In the current state of knowledge, there are several methods to realize complex-amplitude modulation by metasurfaces: changing the angle between two arms of the V-shaped nanostructure with different lengths, [34] changing the size and orientation angle of a single nanobrick, [35][36][37][38][39] changing the opening size and orientation angle of C-shaped nanostructure, [40][41][42][43][44] changing the orientation angle between two arms of X-shaped nanostructure, [45] changing the length/width of arm and orientation angle of cross-shaped nanostructure, [46][47][48][49] and changing the orientation angles of multi-nanostructure metaatom, ...…”

Section: Introductionmentioning

confidence: 99%

Full Complex‐Amplitude Engineering by Orientation‐Assisted Bilayer Metasurfaces

Deng

Guan

et al. 2023

Advanced Optical Materials

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through numerical calculation, one can encode the amplitude and phase of light waves into a CGH, and finally reconstruct the three-dimensional (3D) light field carrying object information through optical diffraction. In this process, a functional element with precise complex-amplitude modulation is the key to the digital encoding of holograms and the modulation of light waves. The modulation ability of light waves affects the numerical characteristics and reconstruction effect of holograms. An ideal complex-amplitude hologram can record the complex-amplitude information including the amplitude and phase of the object. However, since most of the existing optical elements such as conventional hologram recording with photographic negative, diffractive optical elements, and spatial light modulator (SLM) can only modulate the amplitude or phase of light wave, the hologram needs to be converted from the complex-amplitude to the pure amplitude or phase accordingly. With the development of new artificial materials such as metasurfaces, complex-amplitude hologram coding technology has attracted more and more attention due to its high spatial bandwidth product and high reconstruction accuracy.Optical complex-amplitude determines the propagation behavior of light in free space to the maximum extent. Precise control of complex-amplitude is the key to generating user-defined light fields. Current attempts to control optical complex-amplitude using metasurface, however, either have limited amplitude/phase step numbers or lost high lateral resolution since amplitude and phase are usually manipulated with size-varied nanostructures or several nanostructures integrated into a unit-pixel. Here, it is shown that bilayer metasurface can readily decouple optical amplitude and phase, thus achieving arbitrary complex-amplitude modulation only by arranging the orientation angles of nanostructures. In this design, each unit-pixel in one layer has only one nanostructure with the same size, thus significantly increasing the lateral resolution of complex-amplitude modulation. More importantly, the approach of controlling optical complex-amplitude merely by changing nanostructure orientation can significantly simplify the metasurface design and aggrandize the fabrication tolerance, thus enhancing the robustness of metasurfaces toward practical applications.

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“…Thus, for example, one of the most striking properties of MM is the ability of a slab with negative permittivity/permeability to behave as a lens with sub-wavelength resolution for the electric/magnetic field 1 – 3 . MM applications range from microwave and radiofrequency (RF) bands to optical frequencies 4 , with new functionalities in imaging technology recently explored in the optical range 5 – 7 . MM exhibit an inherent narrowband response due to the resonant nature of its constituent elements.…”

Section: Introductionmentioning

confidence: 99%

Metasurfaces of capacitively loaded metallic rings for magnetic resonance imaging surface coils

Freire

2023

Sci Rep

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This work investigates the use of a metasurface made up of a two-dimensional array of capacitively loaded metallic rings to enhance the signal-to-noise ratio of magnetic resonance imaging surface coils and to tailor the magnetic near-field radio frequency pattern of the coils. It is found that the signal-to-noise ratio is increased if the coupling between the capacitively loaded metallic rings in the array is increased. The input resistance and the radiofrequency magnetic field of the metasurface loaded coil are numerically analyzed by means of an efficient algorithm termed the discrete model to determine the signal-to-noise ratio. Standing surface waves or magnetoinductive waves supported by the metasurface introduce resonances in the frequency dependence of the input resistance. The signal-to-noise ratio is found to be optimal at the frequency corresponding to a local minimum existing between these resonances.The discrete model is used in an optimization procedure to fit the structural parameters of a metasurface to enhance the signal-to-noise ratio at the frequency corresponding to this local minimum in the input resistance. It is found that the signal-to-noise ratio can be greatly improved if the mutual coupling between the capacitively loaded metallic rings of the array is made stronger by bringing them closer or by using rings of squared shape instead of circular. These conclusions derived from the numerical results provided by the discrete model are double-checked by means of numerical simulations provided by the commercial electromagnetic solver Simulia CST and by experimental results. Numerical results provided by CST are also shown to demonstrate that the surface impedance of the array of elements can be adjusted to provide a more homogeneous magnetic near-field radio frequency pattern that ultimately leads to a more uniform magnetic resonance image at a desired slice. This is achieved by preventing the reflection of propagating magnetoinductive waves at the edges of the array by matching the elements arranged at the edges of the array with capacitors of suitable value.

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Spatial Coherence Manipulation on the Disorder-Engineered Statistical Photonic Platform

Cited by 15 publications

References 42 publications

Design Strategies and Applications of Dimensional Optical Field Manipulation Based on Metasurfaces

Design Strategies and Applications of Dimensional Optical Field Manipulation Based on Metasurfaces

Full Complex‐Amplitude Engineering by Orientation‐Assisted Bilayer Metasurfaces

Metasurfaces of capacitively loaded metallic rings for magnetic resonance imaging surface coils

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