Abstract
Tomography is an informative imaging modality that is usually implemented by mechanical scanning, owing to the limited depth-of-field (DOF) in conventional systems. However, recent imaging systems are working towards more compact and stable architectures; therefore, developing nonmotion tomography is highly desirable. Here, we propose a metalens-based spectral imaging system with an aplanatic GaN metalens (NA = 0.78), in which large chromatic dispersion is used to access spectral focus tuning and optical zooming in the visible spectrum. After the function of wavelength-switched tomography was confirmed on cascaded samples, this aplanatic metalens is utilized to image microscopic frog egg cells and shows excellent tomographic images with distinct DOF features of the cell membrane and nucleus. Our approach makes good use of the large diffractive dispersion of the metalens and develops a new imaging technique that advances recent informative optical devices.
Highlights
Recent advances in flat optics, enabled by metasurfaces with flexible control of the amplitude, phase, and polarization of light by subwavelength units[1,2,3,4,5,6], have provided unprecedented possibilities in the miniaturization and function expansion of conventional optical elements
Great efforts have been made towards practical applications, such as efficiency improvement[20], chromatic aberration correction[21,22,23,24,25,26] and image corrections[27,28]
We report the design and implementation of an aplanatic metalens with chromatic dispersion to achieve high-resolution spectral tomographic imaging in a nonmotion manner
Summary
Recent advances in flat optics, enabled by metasurfaces with flexible control of the amplitude, phase, and polarization of light by subwavelength units[1,2,3,4,5,6], have provided unprecedented possibilities in the miniaturization and function expansion of conventional optical elements. We report the design and implementation of an aplanatic metalens with chromatic dispersion to achieve high-resolution spectral tomographic imaging in a nonmotion manner.
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