Dielectric metalenses at long-wave infrared wavelengths: Multiplexing and spectroscope

Tang, Feng; Ye, Xin; Li, Qingzhi; Wang, Yudong; Yu, Haichao; Wu, Weidong; Li, Bo; Zheng, Wanguo

doi:10.1016/j.rinp.2020.103215

Cited by 20 publications

(15 citation statements)

References 33 publications

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“…In particular, the all-dielectric metasurfaces have the advantages of low-loss, thermal stability, magnetic effect, etc., [8,10], which is a promising candidate for the miniaturization and integration of complex intense-light systems [24,25]. Although all-dielectric metasurfaces have realized lenses [26][27][28], gratings [29,30], deflectors [31], perfect absorbers [32][33][34][35], etc., the metasurfaces for intense-light applications are less reported in the literature. Some phase-control metasurfaces made of refractory materials such as HfO 2 are reported with the application potential in the high-power systems [31].…”

Section: Introductionmentioning

confidence: 99%

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Tang

et al. 2021

Photonics

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In intense-light systems, the traditional discrete optical components lead to high complexity and high cost. Metasurfaces, which have received increasing attention due to the ability to locally manipulate the amplitude, phase, and polarization of light, are promising for addressing this issue. In the study, a metasurface-based reflective deflector is investigated which is composed of silicon nanohole arrays that confine the strongest electric field in the air zone. Subsequently, the in-air electric field does not interact with the silicon material directly, attenuating the optothermal effect that causes laser damage. The highest reflectance of nanoholes can be above 99% while the strongest electric fields are tuned into the air zone. One presentative deflector is designed based on these nanoholes with in-air-hole field confinement and anti-damage potential. The 1st order of the meta-deflector has the highest reflectance of 55.74%, and the reflectance sum of all the orders of the meta-deflector is 92.38%. The optothermal simulations show that the meta-deflector can theoretically handle a maximum laser density of 0.24 W/µm2. The study provides an approach to improving the anti-damage property of the reflective phase-control metasurfaces for intense-light systems, which can be exploited in many applications, such as laser scalpels, laser cutting devices, etc.

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Section: Introductionmentioning

confidence: 99%

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Tang

et al. 2021

Photonics

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“…Chromatic aberration occurs when light rays passing through a lens focus at frequency-dependent points due to optical dispersion. Chromatic aberration elimination at discrete wavelengths has been achieved through spatial multiplexing 34,[81][82][83] . Multiple sets of meta-atoms are interleaved or stacked, with each controlling the wavefront of a wavelength.…”

Section: Chromatic Aberration Correctionmentioning

confidence: 99%

“…For instance, to achieve the group delay required by a 1-mm-diameter TiO 2 metalens with NA = 0.1 for the VIS band, the height of the meta-atoms must be about 7.5 μm, implying tens or hundreds of aspect ratio. Therefore, discrete-wavelength-achromatic imaging based on spatial multiplexing 34,[81][82][83] or dispersive phase compensation 109 is exploited instead for the large-diameter case. However, large computation resources are required in the multipleobjects design process.…”

Section: Hyperbolicmentioning

confidence: 99%

Dielectric metalens for miniaturized imaging systems: progress and challenges

et al. 2022

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Lightweight, miniaturized optical imaging systems are vastly anticipated in these fields of aerospace exploration, industrial vision, consumer electronics, and medical imaging. However, conventional optical techniques are intricate to downscale as refractive lenses mostly rely on phase accumulation. Metalens, composed of subwavelength nanostructures that locally control light waves, offers a disruptive path for small-scale imaging systems. Recent advances in the design and nanofabrication of dielectric metalenses have led to some high-performance practical optical systems. This review outlines the exciting developments in the aforementioned area whilst highlighting the challenges of using dielectric metalenses to replace conventional optics in miniature optical systems. After a brief introduction to the fundamental physics of dielectric metalenses, the progress and challenges in terms of the typical performances are introduced. The supplementary discussion on the common challenges hindering further development is also presented, including the limitations of the conventional design methods, difficulties in scaling up, and device integration. Furthermore, the potential approaches to address the existing challenges are also deliberated.

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“…All of these requirements make the establishment of proper meta-atoms difficult and complicated, and effective methods should be taken to solve the problem. Spatial multiplexing used in Fresnel lenses [12] can be transferred into the design of achromatic metalenses [13][14][15]. By interleaving different groups of meta-atoms to fit phase profiles respectively, researchers used different parts of metalenses to focus incident light at separate wavelengths.…”

Section: Single-piece Achromatic Metalensesmentioning

confidence: 99%

Recent Progress on Achromatic Metalenses (Invited Review)

Chen¹,

Liu²,

Lei³

et al. 2022

PIER

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As a potential alternative to conventional lenses, metalenses have the advantage of ultrathin volume and light weight over conventional lenses. Such miniaturization is expected to apply to compact, nanoscale optical devices such as micro-cameras and high-resolution display. However, chromatic aberration is an important problem in the practical application of metalenses, which will damage the imaging resolution and color reality for multi-wavelength incident light. Here, we briefly discuss recent development of design methods for achromatic metalenses, containing one or more pieces, and experimental evaluation of their performances.

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Dielectric metalenses at long-wave infrared wavelengths: Multiplexing and spectroscope

Cited by 20 publications

References 33 publications

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Dielectric metalens for miniaturized imaging systems: progress and challenges

Recent Progress on Achromatic Metalenses (Invited Review)

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