Figure | Design concept, processing results and working principle of the extended field of view achromatic meta-axicon cluster. (IMAGE)
Caption
Figure | Design concept, processing results and working principle of the extended field of view achromatic meta-axicon cluster. a, Schematic diagram of the design principle of the off-axis meta-axicons. On the left is a schematic of the phase solution of the off-axis meta-axicon, and on the right are the curves of focal spot offset before and after wideband chromatic aberration correction. b, The processing results of the monolithic integrated meta-axicon cluster, including the physical image of the metasurface sample integrated with 9 meta-axicons, the optical microscopic images of local positions; the local top-view electron microscopic image; and the local oblique-view electron microscopic image. c, Working principle of the extended field of view achromatic meta-axicon cluster. In (c), Image restoration based on non-blind deconvolution and brightness correction are carried out separately for on-axis and off-axis direct imaging results. calibration is performed uniformly for the overall image. There are non-negligible differences in image restoration details as evidenced by the zoomed-in figures of the same position in 9 images, confirming that the image restoration based on the assumption of full-field consistency of the PSF can only output high-quality images within the neighborhood of the designed field angle. 9 high-quality restored regions were extracted and stitched into a whole image.
Credit
Chengmiao Wang et al.
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CC BY