Large effective aperture metalens based on optical sparse aperture system

Liu, Tiecheng; Hu, Jingpei; Zhu, Linglin; Zhou, Ruyi; Zhang, Chong; Wang, Chinhua; Zeng, Aijun; Huang, Huijie

doi:10.3788/col202018.100001

Cited by 4 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mid-infrared range (mid-IR) band of electromagnetic radiation is a particularly useful part of the spectrum [1][2][3][4]. It could enable a wide variety of applications, including thermal imaging, free-space communication, military navigation, and biomedical sensing [5][6][7][8][9][10]. However, the conventional optical components for the infrared band with the thick curved-glass lenses are hard to make, and the devices in this band are highly specialized and expensive.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Achromatic Dielectric Planar Metalens in Mid-IR Range

et al. 2022

View full text Add to dashboard Cite

Metalens are planar lenses composed of the subwavelength arrays, which have unconventional and versatile functionalities to manipulate the light fields compared with the traditional lens. It is noted that the most metalens are designed in a monochromatic mode in the visible or mid-infrared range (mid-IR), however, the broadband range is needed in many practical applications, such as spectroscopy, sensing, and imaging. Here, we design and demonstrate a broadband achromatic dielectric metalens in the mid-IR range of 4 µm–5 µm for near diffraction-limited (1.0λ) focusing. The broadband achromatic propagation and focusing of the metalens are designed and simulated by constructing and optimizing the phase profile. The Pancharatnam-Berry (P-B) phases of all the elements contribute to the main phase increment of the whole phase profile of the metalens. The additional phase is constructed and optimized by using the random search algorithm to obtain the optimized size of all the elements. The focusing efficiency of the achromatic metalens is also optimized and averaged as the result of phase optimization within a wide band for the building elements, while it is lowered comparing with the regular metalens without broadband achromatic designing. Using this combined designing approach, various flat achromatic devices with the broadband metalens can find a new way for full-color detection and imaging.

show abstract

Section: Introductionmentioning

confidence: 99%

A Broadband Achromatic Dielectric Planar Metalens in Mid-IR Range

et al. 2022

View full text Add to dashboard Cite

show abstract

An unconventional optical sparse aperture metalens

et al. 2022

View full text Add to dashboard Cite

Metalens consisting of arrays of subwavelength nanostructures with ultrathin, lightweight, and tailorable characteristics have been in the spotlight to develop next-generation optical elements beyond existing refractive or diffractive optics. However, billions of subwavelength nanostructures of the metalens pose a serious challenge for fabrication, especially for the large-area ones. Herein, we designed and fabricated an unconventional optical sparse aperture (UOSA) metalens that consists of four identical and concentric annular sectors sub-aperture metalens, and it has the larger nonzero domain of modulation transfer function compared with the OSA metalens. The numerical simulation and experiments jointly show that the UOSA metalens has a limited diffraction resolution (0.91 µm) as the conventional full aperture metalens. The UOSA method can not only enlarge the effective aperture of the metalens with lower cost and less processing time but also extend a new degree of freedom for the design of the OSA metalens.

show abstract

Synthetic aperture metalens

et al. 2021

View full text Add to dashboard Cite

Metalenses are ultrathin optical elements that can focus light using densely arranged subwavelength structures. Due to their minimal form factor, they have been considered promising for imaging applications that require extreme system size, weight, and power, such as in consumer electronics and remote sensing. However, as a major impediment prohibiting the wide adoption of the metalens technology, the aperture size, and consequently the imaging resolution, of a metalens are often limited by lithography processes that are not scalable. Here, we propose to adopt a synthetic aperture approach to alleviate the issue, and experimentally demonstrate that, assisted by computational reconstruction, a synthetic aperture metalens composed of multiple metalenses with relatively small aperture size can achieve an imaging resolution comparable to a conventional lens with an equivalent large aperture. We validate the concept via an outdoor imaging experiment performed with a synthetic aperture metalens-integrated near-infrared camera using natural sunlight for target illumination.

show abstract

Large effective aperture metalens based on optical sparse aperture system

Cited by 4 publications

References 0 publications

A Broadband Achromatic Dielectric Planar Metalens in Mid-IR Range

A Broadband Achromatic Dielectric Planar Metalens in Mid-IR Range

An unconventional optical sparse aperture metalens

Synthetic aperture metalens

Contact Info

Product

Resources

About