---
OA_type: closed access
_id: '21573'
abstract:
- lang: eng
  text: '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. '
article_number: '101130G '
article_processing_charge: No
author:
- first_name: Mohammadreza
  full_name: Khorasaninejad, Mohammadreza
  last_name: Khorasaninejad
- first_name: Wei Ting
  full_name: Chen, Wei Ting
  last_name: Chen
- first_name: Alexander Y.
  full_name: Zhu, Alexander Y.
  last_name: Zhu
- first_name: Jaewon
  full_name: Oh, Jaewon
  last_name: Oh
- first_name: Robert C.
  full_name: Devlin, Robert C.
  last_name: Devlin
- first_name: Charles
  full_name: Roques-Carmes, Charles
  id: e2e68fc9-6505-11ef-a541-eb4e72cc3e82
  last_name: Roques-Carmes
- first_name: Ishan
  full_name: Mishra, Ishan
  last_name: Mishra
- first_name: Federico
  full_name: Capasso, Federico
  last_name: Capasso
citation:
  ama: 'Khorasaninejad M, Chen WT, Zhu AY, et al. Planar optics at visible wavelengths
    based on titanium dioxide . In: <i>High Contrast Metastructures VI</i>. Vol 10113.
    ; 2017. doi:<a href="https://doi.org/10.1117/12.2255916">10.1117/12.2255916</a>'
  apa: Khorasaninejad, M., Chen, W. T., Zhu, A. Y., Oh, J., Devlin, R. C., Roques-Carmes,
    C., … Capasso, F. (2017). Planar optics at visible wavelengths based on titanium
    dioxide . In <i>High Contrast Metastructures VI</i> (Vol. 10113). San Francisco,
    CA, United States. <a href="https://doi.org/10.1117/12.2255916">https://doi.org/10.1117/12.2255916</a>
  chicago: Khorasaninejad, Mohammadreza, Wei Ting Chen, Alexander Y. Zhu, Jaewon Oh,
    Robert C. Devlin, Charles Roques-Carmes, Ishan Mishra, and Federico Capasso. “Planar
    Optics at Visible Wavelengths Based on Titanium Dioxide .” In <i>High Contrast
    Metastructures VI</i>, Vol. 10113, 2017. <a href="https://doi.org/10.1117/12.2255916">https://doi.org/10.1117/12.2255916</a>.
  ieee: M. Khorasaninejad <i>et al.</i>, “Planar optics at visible wavelengths based
    on titanium dioxide ,” in <i>High Contrast Metastructures VI</i>, San Francisco,
    CA, United States, 2017, vol. 10113.
  ista: Khorasaninejad M, Chen WT, Zhu AY, Oh J, Devlin RC, Roques-Carmes C, Mishra
    I, Capasso F. 2017. Planar optics at visible wavelengths based on titanium dioxide
    . High Contrast Metastructures VI. SPIE OPTO vol. 10113, 101130G.
  mla: Khorasaninejad, Mohammadreza, et al. “Planar Optics at Visible Wavelengths
    Based on Titanium Dioxide .” <i>High Contrast Metastructures VI</i>, vol. 10113,
    101130G, 2017, doi:<a href="https://doi.org/10.1117/12.2255916">10.1117/12.2255916</a>.
  short: M. Khorasaninejad, W.T. Chen, A.Y. Zhu, J. Oh, R.C. Devlin, C. Roques-Carmes,
    I. Mishra, F. Capasso, in:, High Contrast Metastructures VI, 2017.
conference:
  end_date: 2017-02-02
  location: San Francisco, CA, United States
  name: SPIE OPTO
  start_date: 2017-01-28
date_created: 2026-03-30T12:22:47Z
date_published: 2017-04-28T00:00:00Z
date_updated: 2026-05-05T09:41:50Z
day: '28'
doi: 10.1117/12.2255916
extern: '1'
intvolume: '     10113'
language:
- iso: eng
month: '04'
oa_version: None
publication: High Contrast Metastructures VI
publication_status: published
quality_controlled: '1'
status: public
title: 'Planar optics at visible wavelengths based on titanium dioxide '
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 10113
year: '2017'
...