Perspectives on Imaging with Diffractive Flat Optics

Menon, Rajesh; Brimhall, Nicole

doi:10.1021/acsphotonics.2c01990

Cited by 2 publications

(1 citation statement)

References 67 publications

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“…Similarly, other works have used truncated point-spread functions (PSFs) (which over-estimate the strehl ratios). Many of these problems have been discussed in a recent perspective article that may be of interest to readers . We note in passing that computational post-processing, especially when co-optimized with lens design, is another promising approach for WFOV imaging …”

Section: Introductionmentioning

confidence: 99%

Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging

et al. 2023

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Wide field-of-view (WFOV) imaging is extensively used in fields as diverse as macro photography, virtual reality, machine vision, and microscopy. Conventional WFOV cameras are bulky since they require multiple refractive lenses. Here, we design, fabricate, and characterize a 100° FOV camera with a total-track length of ∼2 mm, composed of an inverse-designed multi-level diffractive doublet with an input-aperture diameter of 0.204 mm, a back-focal length of 1 mm, and operating at λ = 850 nm (bandwidth ∼ 34 nm). Using careful experiments, we characterize the focusing and imaging performance as well as demonstrate de-vignetting based on experimental calibration. The spatial frequency at 10% modulation-transfer-function contrast was measured at 150 and 38 lp/mm for 0 and 50° incident angles, respectively. Our approach can be scaled to larger aperture sizes and smaller f/#s, potentially leading to thin, lightweight WFOV cameras for portable applications.

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Section: Introductionmentioning

confidence: 99%

Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging

et al. 2023

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Generating optical vortex needle beams with a flat diffractive lens

Kumari,

Dev,

Hayward

et al. 2024

Journal of Applied Physics

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We present a novel method for generating optical vortex needle beams (focused optical vortices with extended depth-of-focus) using a compact flat multilevel diffractive lens (MDL). Our experiments demonstrate that the MDL can produce focused optical vortices (FOVs) with topological charges l=1−4 (extendable to other l values), maintaining focus over distances significantly longer than conventional optical vortices. Specifically, FOVs exhibit non-diffracting behavior with a depth-of-focus (DOF) extended beyond 5 cm, compared to conventional optical vortices, which show continuous size increase due to diffraction. When the MDL is illuminated by an optical vortex of 3 mm diameter, it achieves a transmission efficiency of approximately 90% and extends the DOF several times beyond that of traditional lenses. Increasing the size of the input optical vortex further extends the DOF but introduces additional rings, with their number increasing proportionally to the value of l. Our approach, validated by both experimental results and numerical simulations, proves effective for beams such as optical vortex and Hermite-Gaussian modes and holds potential applications in high-resolution imaging, material processing, optical coherence tomography, and three-dimensional optical tweezers, offering a simple and efficient solution for generating non-diffracting beams.

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Perspectives on Imaging with Diffractive Flat Optics

Cited by 2 publications

References 67 publications

Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging

Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging

Generating optical vortex needle beams with a flat diffractive lens

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