# Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging

“Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging” (2016), by Mohammadreza Khorasaninejad et al. Materials Science research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: Mohammadreza Khorasaninejad, Wei Ting Chen, Robert Charles Devlin, Jaewon Oh, Alexander Yutong Zhu, Federico Capasso
- Published: June 2, 2016
- Field: Materials Science
- DOI: https://doi.org/10.1126/science.aaf6644
- Free PDF: https://arxiv.org/pdf/1605.02248

## Abstract

Subwavelength resolution imaging requires high numerical aperture (NA) lenses, which are bulky and expensive. Metasurfaces allow the miniaturization of conventional refractive optics into planar structures. We show that high-aspect-ratio titanium dioxide metasurfaces can be fabricated and designed as metalenses with NA = 0.8. Diffraction-limited focusing is demonstrated at wavelengths of 405, 532, and 660 nm with corresponding efficiencies of 86, 73, and 66%. The metalenses can resolve nanoscale features separated by subwavelength distances and provide magnification as high as 170×, with image qualities comparable to a state-of-the-art commercial objective. Our results firmly establish that metalenses can have widespread applications in laser-based microscopy, imaging, and spectroscopy.

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