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Nano Lett. 2015 Aug 12;15(8):5369-74. doi: 10.1021/acs.nanolett.5b01752. Epub 2015 Jul 27.

Polarization-Independent Silicon Metadevices for Efficient Optical Wavefront Control.

Author information

1
†Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia.
2
‡Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.

Abstract

We experimentally demonstrate a functional silicon metadevice at telecom wavelengths that can efficiently control the wavefront of optical beams by imprinting a spatially varying transmittance phase independent of the polarization of the incident beam. Near-unity transmittance efficiency and close to 0-2π phase coverage are enabled by utilizing the localized electric and magnetic Mie-type resonances of low-loss silicon nanoparticles tailored to behave as electromagnetically dual-symmetric scatterers. We apply this concept to realize a metadevice that converts a Gaussian beam into a vortex beam. The required spatial distribution of transmittance phases is achieved by a variation of the lattice spacing as a single geometric control parameter.

KEYWORDS:

Huygens’ surface; Metasurface; beamshaping; electromagnetic duality; metadevice; vortex beam

PMID:
26192100
DOI:
10.1021/acs.nanolett.5b01752
[Indexed for MEDLINE]

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