Single-Element Diffraction-Limited Fisheye Metalens

Abstract

Wide field-of-view (FOV) optical functionality is crucial for implementation of advanced imaging and image projection devices. Conventionally, wide FOV operation is attained with complicated assembly of multiple optical elements known as "fisheye lenses". Here we present a novel metalens design capable of performing diffractionlimited focusing and imaging over an unprecedented near 180°angular FOV. The lens is monolithically integrated on a one-piece flat substrate and involves only a single layer of metasurface that corrects third-order Seidel aberrations including coma, astigmatism, and field curvature. The metalens further features a planar focal surface, which enables considerably simplified system architectures for applications in imaging and projection. We fabricated the metalens using Huygens meta-atoms operating at 5.2 μm wavelength and experimentally demonstrated aberration-free focusing and imaging over the entire FOV. The design concept is generic and can be readily adapted to different meta-atom geometries and wavelength ranges to meet diverse application demands.

Meta‐Imaging: from Non‐Computational to Computational

“…[73] Copyright 2016, Arbabi et al b) Reproduced with permission. [75] Copyright 2020, American Chemical Society. c) Reproduced with permission.…”

“…[ 74 ] Later, a Huygens flat metalens with an unprecedented >170° angle‐of‐view and capable of correcting primary aberrations was proposed, as illustrated in Figure 7b. [ 75 ] The design processing of the Huygens flat metalens is similar to the doublet metalens yet relies only on a single metasurface, leading to a lower cost imaging system. In addition to imaging in laboratory, a wide FoV metalens was reported recently to perform outdoor imaging.…”

Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses

“…Metalenses (MLs) [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ], meta-holograms [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], structural color [ 28 , 29 , 30 , 31 ], light detection [ 32 , 33 , 34 , 35 , 36 , 37 , 38 ], perfect absorber [ 39 , 40 ], and sensors [ 41 , 42 , 43 , 44 , 45 , 46 , 47 ] are typical applications of optical metasurfaces. Recently, various improvements to MLs have been reported, such as achromatic MLs [ 48 , 49 , 50 ], polarization-insensitive MLs [ 50 , 51 ], wide field-of-view MLs [ 52 , 53 ], large area MLs [ …”

Broadband Achromatic Metalens in Mid‐Wavelength Infrared

“…Narrow operation bandwidths, small size of device, polarization-dependent focusing restricted the performance of the metalenses in MWIR. [51][52][53][54] None of these works were capable of realizing broadband achromatic imaging. High-efficiency and broadband achromatic polarization-independent metalenses with large size and numerical apertures are much more attractive for practical applications, especially for MWIR imaging purpose.…”