Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5369-5374Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01752
Keywords
Metasurface; metadevice; electromagnetic duality; Huygens' surface; vortex beam; beamshaping
Categories
Funding
- Australian Nanotechnology Network
- Australian National University Vice Chancellor's HDR Travel Grants
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Australian Research Council
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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 0-2 pi 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.
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