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arXiv · 2203.12924

Metalenses with polarization-independent adaptive nano-antennas

Jianchao Zhang·Haowen Liang·Yong Long·Yongle Zhou·Qian Sun·Qinfei Wu·Xiao Fu·Emiliano R Martins·Thomas F Krauss·Juntao Li·Xue-Hua Wang
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Abstract

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 with multiple elements, but their polarization sensitivity hinders their application in metalenses. Here, we show that by designing polarization-insensitive dimer nano-antennas and abandoning the principle of equally spaced unit cells, polarization-independent ultrahigh numerical aperture (NA=1.48) oil-immersion operation with an efficiency of 43% can be demonstrated. This represents a significant improvement on other polarization-independent designs at visible wavelength. We also use this single layer metalens to replace a conventional objective lens and demonstrate the confocal scanning microscopic imaging of a grating with a period of 300 nm at 532 nm operating wavelength. Overall, our results experimentally demonstrate a novel design concept that further improves metalens performance.

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Jianchao Zhang, Haowen Liang, Yong Long, Yongle Zhou, Qian Sun, Qinfei Wu, Xiao Fu, Emiliano R Martins, Thomas F Krauss, Juntao Li, Xue-Hua Wang. 2022-03-24. Metalenses with polarization-independent adaptive nano-antennas. https://arxiv.org/abs/2203.12924

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