An efficiently-designed wideband single-metalens with high-efficiency and wide-angle focusing for passive millimeter-wave focal plane array imaging

Chu, Hongjun; Qi, Jiaran; Qiu, Jinghui

doi:10.1364/oe.385498

Cited by 9 publications

(2 citation statements)

References 49 publications

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“…MIM structure-based meta-lens were demonstrated to improve the focusing efficiency, in the near infrared [123] and mid-infrared regimes [183]. Because of the large ohmic loss of metal in optical frequencies, which limits the efficiency to a certain extent, many metallic meta-lens were designed to work in larger wavelength regime, such as Terahertz, millimeter-wave or microwave regime [24,27,92]. Recently, dielectric metasurfaces were developed to circumvent the significant Ohmic losses at optical frequencies [89,173,189,197].…”

Section: Meta-lensmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields of the incident electromagnetic waves, exhibiting unprecedented properties which are most typical within the context of the electromagnetic domain. However, the practical application of metamaterials is found challenging due to the high losses, strong dispersion associated with the resonant responses, and the difficulty in the fabrication of nanoscale 3D structures. The optical metasurface is termed as 2D metamaterials that inherent all of the properties of metamaterials and also provide a solution to the limitation of the conventional metamaterials. Over the past few years, metasurfaces; have been employed for the design and fabrication of optical elements and systems with abilities that surpass the performance of conventional diffractive optical elements. Metasurfaces can be fabricated using standard lithography and nanoimprinting methods, which is easier campared to the fabrication of the counterpart 3 days metamaterials. In this review article, the progress of the research on metasurfaces is illustrated. Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. The development of soft metasurface opens up a new dimension of application zone in conformal or wearable photonics. The progress of soft metasurface has also been discussed in this review. Meta-devices that are being developed with the principle of the shaping of wavefronts are elucidated in this review. Furthermore, it has been established that properties of novel optical metasurface can be modulated by the change in mechanical, electrical, or optical stimuli which leads to the development of dynamic metasurface. Research thrusts over the area of tunable metasurface has been reviewed in this article. Over the recent year, it has been found that optical fibers and metasurface are coagulated for the development of optical devices with the advantages of both domains. The metasurface with lab-on fiber-based devices is being discussed in this review paper. Finally, research trends, challenges, and future scope of the work are summarized in the conclusion part of the article.‬‬‬‬‬‬‬

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Section: Meta-lensmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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“…Thus, a metalens based on diffractive optics can be as thin as hundreds of nanometers, allowing the fabrication of ultrathin flat optical devices with greatly reduced size and mass [ 37 ]. Since the first metalens proposed by Federico Capasso in 2016 [ 37 ], metalenses have now been well developed with high numerical aperture (NA) [ 38 ], high resolution [ 39 ], high efficiency [ 40 ], achromaticity [ 29 , 31 , 41 ], new functions [ 42 ], etc. The phase manipulation methods of metasurfaces can be divided into propagation phase [ 43 ], resonance phase [ 44 ], geometric phase [ 45 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Design of a Bionic Spatial 3D-Arrayed Multifocal Metalens

et al. 2022

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With the development of micro/nano-optics, metasurfaces are gaining increasing attention working as novel electromagnetic wave control devices. Among which, metalenses have been developed and applied as a typical application of metasurfaces owing to their unique optical properties. However, most of those previous metalenses can only produce one focal point, which severely limits their applications. Inspired by the fly compound eye, we propose a special kind of spatial multifocal metalens. Our metalenses can reverse the polarization state of the incident circularly polarized light, which is then focused. In addition, a horizontally aligned multifocal metalens can be achieved by designing reasonable phase and region distributions, which is similar to a vertically aligned one. Most significantly, a spatially 3D-arrayed multifocal metalens with low crosstalk is well achieved by combining these two distribution methods. The proposed bionic 3D-arrayed multifocal metalens with amazing focusing effect promises applications in imaging, nanoparticle manipulation, optical communication, and other fields.

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