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Metalens Design
In article number 2200268, Juntao Li, Haowen Liang, Xiao Fu, and colleagues experimentally realize a polarization‐insensitive and high focus efficiency metalens at 532 nm operation for an NA = 1.48 by using dimer nano‐antennas. This single layer metalens can replace a conventional objective lens and demonstrate the confocal scanning microscopic imaging with 300 nm resolution.
Metalens research has made major advances in recent years. These advances rely on the simple design principle of arranging meta‐atoms in regular arrays to create an arbitrary phase and polarization profile. Unfortunately, the concept of equally spaced meta‐atoms reaches its limit for high deflection angles where the deflection efficiency decreases. The efficiency can be increased using nano‐antennas...
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