Optical Metasurfaces for Designing Planar Cassegrain-Schwarzschild Objectives

Li, Xuan; Deng, Junhong; Li, King Fai; Tang, Yi; Jin, Mingke; Zhou, Jian; Cheng, Xing; Liu, Wei; Li, Gui Xin

doi:10.1103/physrevapplied.11.054055

Cited by 15 publications

(13 citation statements)

References 52 publications

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“…λ is the targeted operational wavelength, which is 4 µm in this work. r 2 and r 1 are the radial coordinates of a moving point from the center to the edge of the metasurface, and |r p | and |r s | are the upper integration limits used to calculate the local phase on the primary and secondary mirror, respectively (see also the Supplementary Information of the reference [30]). Using the above formula, the required phase distribution on the primary and secondary mirrors of the metasurface Cassegrain telescope can be calculated with a home-written code.…”

Section: Design and Simulation Methodsmentioning

confidence: 99%

Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

Yue

Zhang

et al. 2021

Nanomaterials

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Reflective imaging systems such as Cassegrain-type telescopes are widely utilized in astronomical observations. However, curved mirrors in traditional Cassegrain telescopes unavoidably make the imaging system bulky and costly. Recent developments in the field of metasurfaces provide an alternative way to construct optical systems, possessing the potential to make the whole system flat, compact and lightweight. In this work, we propose a design for a miniaturized Cassegrain telescope by replacing the curved primary and secondary mirrors with flat and ultrathin metasurfaces. The meta-atoms, consisting of SiO2 stripes on an Al film, provide high reflectance (>95%) and a complete phase coverage of 0~2π at the operational wavelength of 4 μm. The optical functionality of the metasurface Cassegrain telescope built with these meta-atoms was confirmed and studied with numerical simulations. Moreover, fabrication errors were mimicked by introducing random width errors to each meta-atom; their influence on the optical performance of the metasurface device was studied numerically. The concept of the metasurface Cassegrain telescope operating in the infrared wavelength range can be extended to terahertz (THz), microwave and even radio frequencies for real-world applications, where metasurfaces with a large aperture size are more easily obtained.

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Section: Design and Simulation Methodsmentioning

confidence: 99%

Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

Yue

Zhang

et al. 2021

Nanomaterials

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“…Therefore, the off-axis lens can be used for spectral measurement, and the wavelength resolution in the optical fiber communication band is up to 200 pm. Liu et al designed and experimentally demonstrated a planar Cassegrain-Schwarzschild objective with GEMS [126]. Chen et al proposed a spectral tomographic imaging technology based on aplanatic metalens by focusing different wavelengths on different focal planes [127].…”

Section: Applicationsmentioning

confidence: 99%

Advances in exploiting the degrees of freedom in nanostructured metasurface design: from 1 to 3 to more

Yu²,

Zheng

2020

Nanophotonics

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The unusual electromagnetic responses of nanostructured metasurfaces endow them with an ability to manipulate the four fundamental properties (amplitude, phase, polarization, and frequency) of lightwave at the subwavelength scale. Based on this, in the past several years, a lot of innovative optical elements and devices, such as metagratings, metalens, metaholograms, printings, vortex beam generators, or even their combinations, have been proposed, which have greatly empowered the advanced research and applications of metasurfaces in many fields. Behind these achievements are scientists’ continuous exploration of new physics and degrees of freedom in nanostructured metasurface design. This review will focus on the progress on the design of different nanostructured metasurfaces for lightwave manipulation, including by varying/fixing the dimensions and/or orientations of isotropic/anisotropic nanostructures, which can therefore provide various functionalities for different applications. Exploiting the design degrees of freedom of optical metasurfaces provides great flexibility in the design of multifunctional and multiplexing devices, which can be applied in anticounterfeiting, information encoding and hiding, high-density optical storage, multichannel imaging and displays, sensing, optical communications, and many other related fields.

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“…The metalens has been expected to contribute to the miniaturization of the optical instruments as it can contain much more information than conventional lenses or optic components [99,133,[138][139][140][141][142][143][144][145][146][147][148][149][150]. Figure 8A shows an example of metalens that used the property of the PB phase: The sign of the PB phase is reversed according to the handedness of the incident light [122,144].…”

Section: Researches On the Applications Of Metalensmentioning

confidence: 99%

Progresses in the practical metasurface for holography and lens

Sung

Lee

2019

Nanophotonics

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Metasurfaces have received enormous attention thanks to their unique ability to modulate electromagnetic properties of light in various frequency regimes. Recently, exploiting its fabrication ease and modulation strength, unprecedented and unique controlling of light that surpasses conventional optical devices has been suggested and studied a lot. Here, in this paper, we discuss some parts of this trend including holography, imaging application, dispersion control, and multiplexing, mostly operating for optical frequency regime. Finally, we will outlook the future of the devices with recent applications of these metasurfaces.

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Optical Metasurfaces for Designing Planar Cassegrain-Schwarzschild Objectives

Cited by 15 publications

References 52 publications

Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

Advances in exploiting the degrees of freedom in nanostructured metasurface design: from 1 to 3 to more

Progresses in the practical metasurface for holography and lens

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