High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

We report the first demonstration of a mid-IR reflection-based flat lens with high efficiency and near diffraction-limited focusing. Focusing efficiency as high as 80%, in good agreement with simulations (83%), has been achieved at 45° incidence angle at λ = 4.6 μm. The off-axis geometry considerabl...

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Bibliographic Details
Published in:Optics express 2016-08, Vol.24 (16), p.18024-18034
Main Authors: Zhang, Shuyan, Kim, Myoung-Hwan, Aieta, Francesco, She, Alan, Mansuripur, Tobias, Gabay, Ilan, Khorasaninejad, Mohammadreza, Rousso, David, Wang, Xiaojun, Troccoli, Mariano, Yu, Nanfang, Capasso, Federico
Format: Article
Language:English
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Summary:We report the first demonstration of a mid-IR reflection-based flat lens with high efficiency and near diffraction-limited focusing. Focusing efficiency as high as 80%, in good agreement with simulations (83%), has been achieved at 45° incidence angle at λ = 4.6 μm. The off-axis geometry considerably simplifies the optical arrangement compared to the common geometry of normal incidence in reflection mode which requires beam splitters. Simulations show that the effects of incidence angle are small compared to parabolic mirrors with the same NA. The use of single-step photolithography allows large scale fabrication. Such a device is important in the development of compact telescopes, microscopes, and spectroscopic designs.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.018024