Publication: High Efficiency Near Diffraction-Limited Mid-Infrared Flat Lenses Based on Metasurface Reflectarrays
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Date
2016
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The Optical Society
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Zhang, Shuyan, Myoung-Hwan Kim, Francesco Aieta, Alan She, Tobias Mansuripur, Ilan Gabay, Mohammadreza Khorasaninejad, David Russo, Xiaojun Wang, Mariano Triccoli, Nanfang Yu, and Federico Capasso. 2016. High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrys. In the Proceedings of CLEO: QELS_Fundamental Science 2016, San Jose, California United States, 5–10 June 2016: FTh1D.3.
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Abstract
A limiting factor in the development of mid-infrared optics is the lack of abundant materials that are transparent, low cost, lightweight, and easy to machine. In this paper, we demonstrate a metasurface device that circumvents these limitations. A flat lens based on antenna reflectarrays was designed to achieve near diffraction-limited focusing with a high efficiency (experiment: 80%; simulation: 83%) at 45o incidence angle at λ = 4.6 μm. This geometry considerably simplifies the experimental arrangement compared to the common geometry of normal incidence which requires beam splitters. Simulations show that the effect of comatic aberrations is small compared to parabolic mirrors. The use of single-step photolithography allows large scale fabrication.
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