---
res:
  bibo_abstract:
  - We present a new platform that realizes high performance metasurfaces in the visible
    spectrum. This platform is based on atomic layer deposition of titanium dioxide
    and allows molding incident light wavefront to desired shapes including holographic
    images, optical vortices, and Bessel beams. The focus of this work will be on
    the design and demonstration of planar metalenses. We report on our recent experimental
    realization of high numerical aperture metalenses with efficiency as high as 86%.
    These metalenses can focus light into a diffraction-limited spot and can be employed
    for imaging purposes to provide sub-wavelength imaging resolution. In addition,
    by the judicious design of metalens building blocks, one can achieve a multispectral
    chiral metalens (MCML) within a single metasurface layer. The MCML can simultaneously
    resolve chiral and spectral information of an object without the requirement of
    additional optical components such as polarizers, wave-plates, or even gratings.
    Using this MCML, we map the chiroptical properties of a macroscopic chiral biological
    specimen across the visible range. Finally, since many applications require polarization
    insensitive planar lenses, we discuss the experimental realization of such metalenses
    with numerical apertures as high as NA=0.85. These metalenses can focus incident
    light to a spot as small as ~0.6lambda with efficiencies up to 70%. The straightforward
    and CMOS-compatible fabrication process of this platform is promising for a wide
    range of optics-based applications in multidisciplinary science and technology.
    @eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Mohammadreza
      foaf_name: Khorasaninejad, Mohammadreza
      foaf_surname: Khorasaninejad
  - foaf_Person:
      foaf_givenName: Wei Ting
      foaf_name: Chen, Wei Ting
      foaf_surname: Chen
  - foaf_Person:
      foaf_givenName: Alexander Y.
      foaf_name: Zhu, Alexander Y.
      foaf_surname: Zhu
  - foaf_Person:
      foaf_givenName: Jaewon
      foaf_name: Oh, Jaewon
      foaf_surname: Oh
  - foaf_Person:
      foaf_givenName: Robert C.
      foaf_name: Devlin, Robert C.
      foaf_surname: Devlin
  - foaf_Person:
      foaf_givenName: Charles
      foaf_name: Roques-Carmes, Charles
      foaf_surname: Roques-Carmes
      foaf_workInfoHomepage: http://www.librecat.org/personId=e2e68fc9-6505-11ef-a541-eb4e72cc3e82
  - foaf_Person:
      foaf_givenName: Ishan
      foaf_name: Mishra, Ishan
      foaf_surname: Mishra
  - foaf_Person:
      foaf_givenName: Federico
      foaf_name: Capasso, Federico
      foaf_surname: Capasso
  bibo_doi: 10.1117/12.2255916
  bibo_volume: 10113
  dct_date: 2017^xs_gYear
  dct_language: eng
  dct_title: Planar optics at visible wavelengths based on titanium dioxide @
...