2019
DOI: 10.1364/oe.27.018794
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All-dielectric metasurface grating for on-chip multi-channel orbital angular momentum generation and detection

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Cited by 21 publications
(4 citation statements)
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“…However, they are all non-intrinsic but introduced by the non-ideal factors in metasurface design and fabrication. For example, there would be unmodulated light of metasurface [62][63][64] . In the vortex beam generation of this work, a blazed grating is overlaid on the phase pattern to spatially separate the unmodulated light 65 and details are presented in Supplementary Text 4.…”
Section: Discussionmentioning
confidence: 99%
“…However, they are all non-intrinsic but introduced by the non-ideal factors in metasurface design and fabrication. For example, there would be unmodulated light of metasurface [62][63][64] . In the vortex beam generation of this work, a blazed grating is overlaid on the phase pattern to spatially separate the unmodulated light 65 and details are presented in Supplementary Text 4.…”
Section: Discussionmentioning
confidence: 99%
“…Underwater wireless optical communication (UWOC), which has the advantages of large bandwidth, high transmission rate and good confidentiality, has attracted the attention of a wide range of researchers [1,2]. Vortex beams, characterized by their possession of orbital angular momentum (OAM), with each photon carrying an OAM value of m 0 ÿ, where unlimited index m 0 represents the topological charge and ÿ is reduced Planck constant, can provide another degree of freedom for multiplexing applications due to the orthogonality among different OAM indexes [3][4][5][6][7][8]. It has been shown that the OAM multiplexing technique can significantly enhance the transmission efficiency of UWOC systems [9][10][11][12][13].…”
Section: Introductionmentioning
confidence: 99%
“…Interferometric methods to identify the OAM charges have been proposed using a lateral shear interferometer [6,7], self-interference [8], Mach-Zehnder interferometers [9,10], an inverted field interferometer [11], and a multipoint interferometer [12]. Other approaches to detect OAM state have exploited far-field diffraction patterns with a single slit [13], a double slit [14], and with unique apertures including a triangular aperture [15], a hexagonal aperture [16], a binaural circular aperture [17], a parabolic-line grating [18], a radial grating [19], a selectorial screen of a transparent disk [20], and a metasurface grating [21]. Diffraction has been used for OAM determination not only in the far-field context, but also as near-field diffraction.…”
Section: Introductionmentioning
confidence: 99%