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

• Tipo de documento: Artigo Científico
• Fonte: LASER & PHOTONICS REVIEWS; v. 16, n. 9, p. 8-pg., 2022-07-21.

Resumo

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. (AU)

• Processo FAPESP: 21/06121-0 - Propagação de ondas eletromagnéticas em estruturas complexas
• Beneficiário: Ben-Hur Viana Borges
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/00619-4 - Metasuperfícies para imageamento e sensoriamento
• Beneficiário: Emiliano Rezende Martins
• Modalidade de apoio: Auxílio à Pesquisa - Regular