Abstract
We present a terahertz spherical aberration-corrected metalens that uses the dynamic phase to achieve polarization multiplexed imaging. The designed metalens has polarization–dependent imaging efficiencies and polarization extinction ratios that exceed 50% and 10:1, respectively. Furthermore, opposite gradient phases can be applied to orthogonal polarizations to shift the imaging of the two polarized sources in the longitudinal and transverse directions. Indeed, we find that the metalens has a smaller depth-of-focus than a traditional metalens when imaging point sources with limited objective lengths. These results provide a new approach for achieving multifunctional beam steering, tomographic imaging and chiroptical detection.
Highlights
Large-aperture imaging lenses are used in a variety of high-resolution applications
We show that the spherical aberration-corrected metalens images a point source located at a limited object length, and its full width at half maximum (FWHM) is 2.24 mm in the longitudinal direction
The spherical aberration-corrected metalens greatly improves the focusing for a point source at an object distance of 2 f, which indicates that high resolution can be achieved in tomographic imaging
Summary
Large-aperture imaging lenses are used in a variety of high-resolution applications. Remote sensing and the Hubble telescope are among the best-known optical imaging system examples. Some of the metasurface-based optical imaging provides advantages relevant to system integration [32,33] and smart programming [34] and many studies have reported the use of metasurfaces in endoscopes [35] and for beam shaping [36,37,38,39]. These features provide a method of eliminating spherical aberration in flat metalenses. This work provides ideas for the design of multifunctional integrated metalenses, and should promote the application of metasurfaces in multifunctional beam steering, tomographic imaging and chiroptical detection
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