Thin high numerical aperture metalens

Kotlyar, V. V.; Nalimov, Anton G.; Hu, Chengchen; O’Faoláin, Liam; Kotlyar, M. V.; Gibson, D. R.; Song, Shigeng

doi:10.1364/oe.25.008158

Cited by 28 publications

(17 citation statements)

References 18 publications

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“…Meta-optics have the advantage of extreme form birefringence, which enable them to manipulate the polarization states of light in unique manners. A few illustrative examples of these advantages are in polarimetric imaging [31], high-efficiency polarizers [32] and polarization sensitive optics [33]. Additionally, their sub-wavelength dimensions are extremely useful in integrated optics and photonics, where integration density is a critical parameter for technology adoption [34][35][36].…”

Section: Figure 3: Broadband Mdls Design (A-c) and Simulated Point-smentioning

confidence: 99%

Imaging with flat optics: metalenses or diffractive lenses?

Banerji

Meem

Majumder

et al. 2019

Optica

252

152

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Recently, there has been an explosion of interest in metalenses for imaging. The interest is primarily based on their sub-wavelength thicknesses. Diffractive lenses have been used as thin lenses since the late 19 th century. Here, we show that multi-level diffractive lenses (MDLs), when designed properly can exceed the performance of metalenses. Furthermore, MDLs can be designed and fabricated with larger constituent features, making them accessible to low-cost, large area volume manufacturing, which is generally challenging for metalenses. The support substrate will dominate overall thickness for all flat optics. Therefore the advantage of a slight decrease in thickness (from ~2λ to ~λ/2) afforded by metalenses may not be useful. We further elaborate on the differences between these approaches and clarify that metalenses have unique advantages when manipulating the polarization states of light.

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Section: Figure 3: Broadband Mdls Design (A-c) and Simulated Point-smentioning

confidence: 99%

Imaging with flat optics: metalenses or diffractive lenses?

Banerji

Meem

Majumder

et al. 2019

Optica

252

152

View full text Add to dashboard Cite

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“…A method for designing metalenses in a thin amorphous silicon film for the visible light spectrum was described in [ 23 ]. Briefly, it is as follows.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The design of the metalens based on a spiral phase plate for the incident circularly polarized light was considered in detail in [ 23 ]. In this work, we design an SZP and a corresponding metalens that can generate two optical vortices with topological charges 1 and 2.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Ultra-Thin, Short-Focus, and High-Aperture Metalens for Generating and Detecting Laser Optical Vortices

Nalimov

Kotlyar

2022

Nanomaterials

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A combined high-aperture metalens in a thin silicon nitride film that consists of two tilted sectored metalenses is considered. Each sector of the metalens consists of a set of binary subwavelength gratings. The diameter of the metalens is 14 μm. Using a time-domain finite difference method, we show that the metalens can simultaneously detect optical vortices with two topological charges −1 and −2, almost over the entire spectrum of visible wavelengths. The metalens can distinguish several wavelengths that are focused at different points in the focal plane due to a 1-nm change in wavelength resulting in a focal spot shift of about 4 nm. When the metalens is illuminated by a Gaussian beam with left-handed circular polarization, two optical vortices with topological charges 1 and 2 are simultaneously formed 6-μm apart at the focal distance of 6 μm.

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“…Despite of exciting progresses in plasmonic metaholograms, the low‐efficiency issue of transmissive plasmonic metasurfaces for visible light still hinders their practical applications. It is this reason that stimulates the rapid developments of all‐dielectric metaholograms . Recently, Faraon and co‐workers reported that a polarization‐switchable phase hologram can generate two different patterns for two orthogonally polarized LP lights .…”

Section: Applicationsmentioning

confidence: 99%

High‐Efficiency Metasurfaces: Principles, Realizations, and Applications

Sun

Xiao

et al. 2018

Advanced Optical Materials

307

157

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application demands in different aspects, such as information communications, national defenses, security and sensing, and energy utilizations. A key scientific issue, commonly requested in all those applications, is how to efficiently control EM waves at will based on devices/systems with physical sizes as miniaturized as possible. Conventional devices (such as lens, mirror, polarizer, etc.) to control EM waves are made by naturally existing dielectric materials. However, since these materials possess very limited variation range of permittivity, conventional devices typically exhibit bulky sizes and curved shapes to ensure enough propagating phases accumulated to achieve certain functionality. In addition, conventional devices do not necessarily exhibit high working efficiencies, due to the impedance-mismatch issues caused by lacking magnetic responses in natural materials.Metamaterials (MTMs), 3D artificial materials composed by array of subwavelength microstructures (e.g., "metaatoms") with tailored EM responses, provide the possibility to solve the above grand challenges. Through careful structural tuning, MTMs can in principle be designed to exhibit arbitrary values of permittivity ε and permeability μ, and thus they exhibit significantly strengthened capabilities to control EM waves, generating many fascinating wave-manipulation effects not achievable with naturally existing materials. [1][2][3][4][5][6] However, despite of great successes already achieved, applications of the new concepts proposed based on 3D MTMs are hampered by the device sizes, losses in metallic structures, and fabrication challenges of complex 3D MTM structures.Metasurfaces are probably the best candidate to solve the issues of 3D MTMs. Simply speaking, metasurfaces can be viewed as the 2D version of MTMs, which are constructed by planar meta-atoms with purposely selected EM responses arranged in some specific orders. However, the working principles of metasurfaces are quite different from that of 3D MTMs in controlling EM waves. Whereas typically 3D MTMs still reply on manipulating the propagating phases inside the bulk media to realize certain wave-control effects, metasurfaces largely utilize the abrupt phase changes on the structure surfaces for transmitted or reflected waves. In general, tailoring the spatial inhomogeneity of metasurfaces to make them exhibit certain predetermined phase distributions for transmitted or reflected wave, one can use them to efficiently reshape the wave-fronts of Metasurfaces are planar metamaterials exhibiting certain inhomogeneous phase distributions for transmitted or reflected waves, which can efficiently reshape the wave-fronts of incident beams in desired manners based on the Huygens principle. Due to their exotic abilities to freely manipulate electromagnetic (EM) waves on a flat and ultrathin platform, metasurfaces have attracted intensive attention recently, resulting in numerous new concepts and effects that could possibly find applications in many different aspects. In this article, the k...

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Thin high numerical aperture metalens

Cited by 28 publications

References 18 publications

Imaging with flat optics: metalenses or diffractive lenses?

Imaging with flat optics: metalenses or diffractive lenses?

Ultra-Thin, Short-Focus, and High-Aperture Metalens for Generating and Detecting Laser Optical Vortices

High‐Efficiency Metasurfaces: Principles, Realizations, and Applications

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