Multidimensional manipulation of wave fields based on artificial microstructures

Zhang, Yuebian; Liu, Hui; Cheng, Hua; Tian, Jie; Chen, Shuqi

doi:10.29026/oea.2020.200002

Cited by 116 publications

(55 citation statements)

References 360 publications

(454 reference statements)

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“…In the near future, our study has room for improvement: 1. Many new methods have been proposed 44,45 , which are expected to be employed in photoacoustic imaging; 2. Various diseases of anterior segment should be studied, and strict statistical rules should be followed to establish exact relationship between degree of lesions and corresponding indicators.…”

Section: Discussionmentioning

confidence: 99%

Customized anterior segment photoacoustic imaging for ophthalmic burn evaluation <i>in vivo</i>

Zhao¹,

Li²,

Yang³

et al. 2021

OEA

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Photoacoustic imaging has many advantages in ophthalmic application including high-resolution, requirement of no exogenous contrast agent, and noninvasive acquisition of both morphologic and functional information. However, due to the limited depth of focus of the imaging method and large curvature of the eye, it remains a challenge to obtain high quality vascular image of entire anterior segment. Here, we proposed a new method to achieve high quality imaging of anterior segment. The new method applied a curvature imaging strategy based on only one time scanning, and hence is time efficient and more suitable for ophthalmic imaging compared to previously reported methods using similar strategy. A custom-built photoacoustic imaging system was adapted for ophthalmic application and a customized image processing method was developed to quantitatively analyze both morphologic and functional information in vasculature of the anterior segment. The results showed that the new method improved the image quality of anterior segment significantly compared to that of conventional high resolution photoacoustic imaging. More importantly, we applied the new method to study ophthalmic disease in an in vivo mouse model for the first time. The results verified the suitability and advantages of the new method for imaging the entire anterior segment and the numerous potentials of applying it in ophthalmic imaging in future.

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Section: Discussionmentioning

confidence: 99%

Customized anterior segment photoacoustic imaging for ophthalmic burn evaluation <i>in vivo</i>

Zhao¹,

Li²,

Yang³

et al. 2021

OEA

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“…In recent years, with the enormous development of nanofabrication technologies, metasurfaces consisting of subwavelength nanostructures have attracted much attention in many optical research fields due to their powerful capabilities in modulating the amplitude, phase, and polarization 13,14 of light 15 , such as beam splitters 16,17 , metalenses 18−24 , orbital angular momentum (OAM) devices 25−30 and structural color elements 31−35 . Holograms require complicated light field modulation capabilities, and therefore, metasurfaces can be utilized to achieve holographic display.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in optical dynamic meta-holography

Gao¹,

Fan²,

Xiong³

et al. 2021

OEA

146

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Holography, with the capability of recording and reconstructing wavefronts of light, has emerged as an ideal approach for future deep-immersive naked-eye display. However, the shortcomings (e.g., small field of view, twin imaging, multiple orders of diffraction) of traditional dynamic holographic devices bring many challenges to their practical applications. Metasurfaces, planar artificial materials composed of subwavelength unit cells, have shown great potential in light field manipulation, which is useful for overcoming these drawbacks. Here, we review recent progress in the field of dynamic metasurface holography, from realization methods to design strategies, mainly including typical research works on dynamic meta-holography based on tunable metasurfaces and multiplexed metasurfaces. Emerging applications of dynamic meta-holography have been found in 3D display, optical storage, optical encryption, and optical information processing, which may accelerate the development of light field manipulation and micro/nanofabrication with higher dimensions. A number of potential applications and possible development paths are also discussed at the end.

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“…As a two‐dimensional version of metamaterial, metasurface has been introduced to control scattering properties of EM waves, and has been used to develop hyper lenses, perfect absorbers, gradient index lenses, energy harvesting systems, optofluidic barriers, polarization converters, vortex micro‐lasers, and multifunctional compact devices. [ 11–28 ] These intensive interests can be attributed to their simple fabrication, low cost, and powerful functionality to manipulate the EM waves in their phases, amplitudes, polarizations, propagations, and trajectories by arranging the artificial microstructures on a flat interface. For example, absorptive metasurface has been designed for radar cross‐section (RCS) reduction.…”

Section: Introductionmentioning

confidence: 99%

“…[ 25–27 ] In general, the anisotropy metasurface with polarization conversion controls the scattering beams according to the polarization interference. [ 28–30 ] It is necessary to note that the metasurface has been used to improve the emission of radiation array with Fabry–Pérot cavity and the strong coupling effects. [ 31 ]…”

Section: Introductionmentioning

confidence: 99%

Programmable Controls to Scattering Properties of a Radiation Array

Zhang

et al. 2021

Laser & Photonics Reviews

114

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Electromagnetic (EM) waves have been widely applied in wireless communications, radar detection, navigation, and target recognition. Radiation and scattering are two common behaviors in the EM community, but it remains a long‐standing challenge to control them in a dynamical way, especially using a single, low‐cost, and compact hardware. Here, a promising solution is proposed by combining a programmable metasurface with a radiation array, which can manipulate the scattering properties, digitally and in real‐time, and exhibit different radiation modes simultaneously. More advantageous over previous investigations with the fixed radiation‐scattering performance, a field‐programmable gate array is introduced to extend, realize, and verify the multiple functions of the meta‐microstructure (MMS). As a proof‐of‐concept, multiple functions, including polarization conversion, scattering beam manipulation, diffusion scattering, radar cross‐section reduction, EM waves radiation, and vortex beam generation, have been adequately demonstrated by the MMS prototype.

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Multidimensional manipulation of wave fields based on artificial microstructures

Cited by 116 publications

References 360 publications

Customized anterior segment photoacoustic imaging for ophthalmic burn evaluation <i>in vivo</i>

Customized anterior segment photoacoustic imaging for ophthalmic burn evaluation <i>in vivo</i>

Recent advances in optical dynamic meta-holography

Programmable Controls to Scattering Properties of a Radiation Array

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