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Metalenses with Polarization-Insensitive Adaptive Nano-Antennas
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-21 , DOI: 10.1002/lpor.202200268 Jianchao Zhang 1 , Haowen Liang 1, 2 , Yong Long 1 , Yongle Zhou 1 , Qian Sun 1 , Qinfei Wu 1 , Xiao Fu 1 , Emiliano R. Martins 3 , Thomas F. Krauss 4 , Juntao Li 1 , Xue‐Hua Wang 1
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-21 , DOI: 10.1002/lpor.202200268 Jianchao Zhang 1 , Haowen Liang 1, 2 , Yong Long 1 , Yongle Zhou 1 , Qian Sun 1 , Qinfei Wu 1 , Xiao Fu 1 , Emiliano R. Martins 3 , Thomas F. Krauss 4 , Juntao Li 1 , Xue‐Hua Wang 1
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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, it is shown that by designing polarization-insensitive dimer nano-antennas and abandoning the principle of equally spaced unit cells, polarization-insensitive ultrahigh numerical aperture (NA = 1.48) oil-immersion operation with an efficiency of 42% can be demonstrated. This represents a significant improvement on other polarization-insensitive designs at visible wavelength. This single layer metalens is used to replace a conventional objective lens and demonstrates the confocal scanning microscopic imaging of a grating with a period of 300 nm at 532 nm operating wavelength. Overall, the results experimentally demonstrate a novel design concept that further improves metalens performance.
中文翻译：
具有偏振不敏感自适应纳米天线的超透镜
近年来，Metalens 研究取得了重大进展。这些进步依赖于在规则阵列中排列元原子以创建任意相位和极化分布的简单设计原则。不幸的是，等间距元原子的概念在偏转效率降低的高偏转角方面达到了极限。使用具有多个元素的纳米天线可以提高效率，但它们的偏振敏感性阻碍了它们在超透镜中的应用。在这里，表明通过设计偏振不敏感的二聚体纳米天线并放弃等间距单元的原理，可以证明效率为42％的偏振不敏感的超高数值孔径（NA = 1.48）油浸操作。这代表了对可见波长的其他偏振不敏感设计的显着改进。这种单层超透镜用于替代传统的物镜，并展示了在 532 nm 工作波长下周期为 300 nm 的光栅的共焦扫描显微成像。总体而言，实验结果证明了一种新颖的设计概念，可进一步提高超透镜的性能。
更新日期：2022-07-21
中文翻译：
具有偏振不敏感自适应纳米天线的超透镜
近年来，Metalens 研究取得了重大进展。这些进步依赖于在规则阵列中排列元原子以创建任意相位和极化分布的简单设计原则。不幸的是，等间距元原子的概念在偏转效率降低的高偏转角方面达到了极限。使用具有多个元素的纳米天线可以提高效率，但它们的偏振敏感性阻碍了它们在超透镜中的应用。在这里，表明通过设计偏振不敏感的二聚体纳米天线并放弃等间距单元的原理，可以证明效率为42％的偏振不敏感的超高数值孔径（NA = 1.48）油浸操作。这代表了对可见波长的其他偏振不敏感设计的显着改进。这种单层超透镜用于替代传统的物镜，并展示了在 532 nm 工作波长下周期为 300 nm 的光栅的共焦扫描显微成像。总体而言，实验结果证明了一种新颖的设计概念，可进一步提高超透镜的性能。
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