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Zhang, Jianchao ; Sun, Qian ; Wang, Zhengyang ; Zhang, Guangyong ; Liu, Yikun ; Liu, Jin ; Martins, Emiliano R. ; Krauss, Thomas F. ; Liang, Haowen ; Li, Juntao ; Wang, Xue-Hua

• Tipo de documento: Artigo Científico
• Fonte: Nano Letters; v. 24, n. 16, p. 7-pg., 2024-04-03.

Resumo

Metalenses are typically designed for a fixed focal length, restricting their functionality to static scenarios. Various methods have been introduced to achieve the zoom function in metalenses. These methods, however, have a very limited zoom range, or they require additional lenses to achieve direct imaging. Here, we demonstrate a zoom metalens based on axial movement that performs both the imaging and the zoom function. The key innovation is the use of a polynomial phase profile that mimics an aspheric lens, which allows an extended depth of focus, enabling a large zoom range. Experimental results show that this focal length variation, combined with the extended depth of focus, translates into an impressive zoom range of 11.9x while maintaining good imaging quality. We see applications for such a zoom metalens in surveillance cameras of drones or microrobots to reduce their weight and volume, thus enabling more flexible application scenarios. (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