• Corpus ID: 118360293

Planar Lenses at Visible Wavelengths

@article{Khorasaninejad2016PlanarLA,
  title={Planar Lenses at Visible Wavelengths},
  author={Mohammadreza Khorasaninejad and Wei Ting Chen and Robert C Devlin and Jaewon Oh and Alexander Y. Zhu and Federico Capasso},
  journal={arXiv: Optics},
  year={2016}
}
Sub-wavelength 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 meta-lenses with NA = 0.8. Diffraction-limited focusing is demonstrated at wavelengths of 405 nm, 532 nm, and 660 nm with corresponding efficiencies of 86%, 73%, and 66%. The meta-lenses can… 

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    22nd IEEE International Semiconductor Laser Conference
  • 2010
A new concept of dielectric subwavelength grating has emerged. This grating leverages a high contrast in refractive indices for the grating medium and its surroundings. We will discuss how