Broadband lightweight flat lenses for long-wave infrared imaging

Meem, Monjurul; Banerji, Sourangsu; Majumder, Apratim; Vasquez, Fernando Guevara; Sensale‐Rodriguez, Berardi; Menon, Rajesh

doi:10.1073/pnas.1908447116

Cited by 92 publications

(61 citation statements)

References 29 publications

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“…Previously, we have shown broadband diffractive lenses for imaging [11][12][13][14][15][16]. In analogy with that work, here we show that the BDOE is equivalent to a lens whose point-spread function (PSF) is structured in the form of the desired image.…”

Section: The Bdoe As a Lenssupporting

confidence: 67%

Multi-plane, multi-band image projection via broadband diffractive optics

Meem

Majumder²,

Menon³

2019

Appl. Opt.

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We demonstrate visible and near-IR image projection via non-absorbing, multi-level Broadband Diffractive-Optical Elements (BDOEs) in 1 or more planes. By appropriate design of the BDOE topography, we experimentally demonstrate: (1) different images in different spectral bands; (2) different images in different image planes; (3) image magnification by changing the distance between the illumination source and the BDOE; (4) completely flat BDOE via an index-contrast top-coating; and (5) reflective BDOEs. All of these are accomplished with broadband illumination. Furthermore, the BDOEs are highly efficient, versatile and can be inexpensively mass manufactured using imprint-based replication techniques.

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Section: The Bdoe As a Lenssupporting

confidence: 67%

Multi-plane, multi-band image projection via broadband diffractive optics

Meem

Majumder²,

Menon³

2019

Appl. Opt.

Self Cite

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“…Our proposed SLAC flat lens has three major differences in both design and fabrication in comparison with reported multilevel diffractive lenses. [ 26–28 ] First, although wide FOV imaging has been achieved by multilevel diffractive lenses up to 50°, the off‐axial aberrations are not compensated that results in imaging quality degradation for off‐axial FOVs. The off‐axial aberrations are compensated in SLAC flat lens.…”

Section: Resultsmentioning

confidence: 99%

“…Multilevel diffractive lenses have been demonstrated as alternatives to metalenses with thickness of several micrometers. Although reported multilevel diffractive lenses have shown wide FOV imaging up to 50°, [ 26–28 ] the off‐axial aberrations are not compensated, which lead to severely imaging quality degradation for off‐axial FOVs. Therefore, the ratio for FOV versus the overall thickness for current multilevel diffractive lenses are 0.…”

Section: Introductionmentioning

confidence: 99%

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Hao

Gao

Ruan

et al. 2020

Laser & Photonics Reviews

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Metasurfaces are planarized and miniaturized versions of conventional optical elements. Subwavelength‐thick single‐layer metalenses have diffraction limited resolution for on‐axis imaging but relatively low resolution for off‐axis imaging due to off‐axial aberrations. The aberrations of planar single‐layer metalenses have been corrected by patterning two metasurfaces on both sides of a substrate to form metalens doublets with a thickness of hundreds of micrometers to millimeters. The multilevel diffractive lenses are demonstrated to achieve wide angle imaging with a thickness of several micrometers, however, the off‐axial aberrations are not compensated. Here, an epsilon‐greedy algorithm‐based scheme for achieving a planar wavelength‐thick single‐layer aberration‐compensated (SLAC) flat lens consisting of dielectric nanoring structures fabricated by 3D printing are proposed. The scheme is experimentally validated via a SLAC flat lens. This SLAC flat lens has a thickness of 1 µm, a numerical aperture of 0.45, a focal length of 1 mm, a full field of view (FOV) of 32° that enables aberration‐compensated imaging along the focal plane and monochromatic microscopic imaging with resolution better than 2.2 µm at a wavelength of 633 nm. This scheme can lead to ultrathin wide‐FOV flat lens designs as well as low‐cost mass production, which has various applications in miniscopes, mobile camera modules, and machine vision.

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“…4(e) and (f). The designed rotationally symmetric multilevel diffractive lenses with two orders of magnitude lighter than traditional lens can be utilized to image without achromatic aberration [63].…”

Section: Achromatic Metalensesmentioning

confidence: 99%

Imaging based on metalenses

et al. 2020

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Metalens, a prominent application of two-dimensional metasurfaces, has demonstrated powerful abilities even beyond traditional optical lenses. By manipulating the phase distribution of metalens composed of appropriately arranged nanoscale building blocks, the wavefront of incident wave can be controlled based on Huygens principle, thus achieving the desired reflected and transmitted wave for many different purposes. Metalenses will lead a revolution in optical imaging due to its flat nature and compact size, multispectral acquisition and even off-axis focusing. Here, we review the recent progress of metalenses presenting excellent properties, with a focus on the imaging application using these metalenses. We firstly discuss the mechanism for achieving metalenses with high efficiency, large numerical aperture, controlling the chromatic dispersion or monochromatic aberrations and large area fabrication. Then, we review several important imaging applications including wide-band focusing imaging, polarization dependent imaging, light field imaging and some other significant imaging systems in different areas. Finally, we make a conclusion with an outlook on the future development and challenges of this developing research field.

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Broadband lightweight flat lenses for long-wave infrared imaging

Cited by 92 publications

References 29 publications

Multi-plane, multi-band image projection via broadband diffractive optics

Multi-plane, multi-band image projection via broadband diffractive optics

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Imaging based on metalenses

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