Inverse-designed multi-level diffractive doublet for wide field-of-view imaging
Published in ACS Photonics, 2023
This work demonstrates an ultra-thin 100° wide-field-of-view camera using an inverse-designed multi-level diffractive doublet.
Multi-level diffractive lens (MDL) doublet for 100° FOV imaging.(a) The camera is composed of the assembled doublet placed in proximity to the image sensor (TTL ∼ 2 mm). The experimental image of a printed paper with a 100° FOV (object-distance = 120 mm, imagedistance ∼1 mm, and LED with λ ∼ 805−839 nm). (b) The MDL doublet can be assembled with retaining rings and a shim spacer into a conventional lens mount. In our experiments, we used UV glue instead of the rings. (c) Side view of the MDL doublet showing on- and off-axis focusing.
Fabrication and assembly of the MDL doublet. (a) Top-view optical micrograph. (b) 3D scanning-confocal micrograph and (c) radial cross-section through the center of MDL1. Corresponding results for MDL2 are in (d−f), respectively. (g) Optical micrograph of the MDL doublet after assembly. (h) Schematic of the process used to align the two MDLs. (i) Side view of the details of the MDL doublet. The air gap between the MDLs was set by a precision shim.
Imaging by the MDL doublet. (a) Schematic of the optical setup. Resolution test targets: (b) raw image and (c) image after de-vignetting. (d) Magnified views of group 2 elements from various incident angles. (e) Line-scans through horizontal lines in group 2, element 3, as a function of incident angle. (f) Images of plush toys after de-vignetting. (g) Magnified views of the scene in (f) at small (top) and large (bottom) angles. (h) Image of lab members after de-vignetting. (f−h) were illuminated from the same side as the camera (see Supporting Information for all raw images and other details).
Recommended citation: Lin, Dajun, et al. "Inverse-designed multi-level diffractive doublet for wide field-of-view imaging." ACS Photonics 10.8 (2023): 2661-2669.
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