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Wavefront Engineering with Phase Discontinuities: Designer Interfaces for High Performance Planar Optical Components

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Technical Report,01 Jul 2012,30 Jun 2015

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President and Fellows of Harvard College Office for Sponsored Programs Cambridge United States

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The PI and his group opened up new directions of research the generation of vector beams with metasurfaces that control amplitude, phase andpolarization of wavefronts, the detection of wavefronts using metasurfaces, new metasurfaces for controlling surface plasmon wavefronts and highperformance device applications of metasurfaces on graphene. In the vector beam area they generated radially polarized light with a singlenanostructured metasurface and showed broadband operation from the visible to the near infrared. The PIs team designed holographic metasurfacesthat detect the orbital angular momentum of vortex beams and integrated them into commercial silicon photodiodes. They studied surfaceplasmon wakes, showing that they can be steered using a one dimensional metamaterial made of rotated apertures, and demonstrated fishboneplasmonic couplers that enable polarization-controlled tunable directional coupling of light into surface plasmon polaritons. Both bidirectionaland unidirectional launching of the latter were demonstrated along with polarization-selective coupling in dielectric waveguide withembedded fishbone couplers. They investigated metasurfaces on graphene and observed greatly enhanced performance in detectors and modulators.

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