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Title: Nonlinear metasurface for simultaneous control of spin and orbital angular momentum in second harmonic generation
Authors: Li, Guixin
Wu, Lin
Li, King F.
Chen, Shumei
Schlickriede, Christian
Xu, Zhengji
Huang, Siya
Li, Wendi
Liu, Yanjun
Pun, Edwin Y. B.
Zentgraf, Thomas
Cheah, Kok W.
Luo, Yu
Zhang, Shuang
Keywords: Metasurface
Optical Vortex
Issue Date: 2017
Source: Li, G., Wu, L., Li, K. F., Chen, S., Schlickriede, C., Xu, Z., et al. (2017). Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation. Nano Letters, 17(12), 7974-7979.
Series/Report no.: Nano Letters
Abstract: The spin and orbital angular momentum (SAM and OAM) of light is providing a new gateway toward high capacity and robust optical communications. While the generation of light with angular momentum is well studied in linear optics, its further integration into nonlinear optical devices will open new avenues for increasing the capacity of optical communications through additional information channels at new frequencies. However, it has been challenging to manipulate the both SAM and OAM of nonlinear signals in harmonic generation processes with conventional nonlinear materials. Here, we report the generation of spin-controlled OAM of light in harmonic generations by using ultrathin photonic metasurfaces. The spin manipulation of OAM mode of harmonic waves is experimentally verified by using second harmonic generation (SHG) from gold meta-atom with 3-fold rotational symmetry. By introducing nonlinear phase singularity into the metasurface devices, we successfully generate and measure the topological charges of spin-controlled OAM mode of SHG through an on-chip metasurface interferometer. The nonlinear photonic metasurface proposed in this work not only opens new avenues for manipulating the OAM of nonlinear optical signals but also benefits the understanding of the nonlinear spin–orbit interaction of light in nanoscale devices.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.7b04451
Rights: © 2017 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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