Spin-Selective Second-Harmonic Vortex Beam Generation with Babinet-Inverted Plasmonic Metasurfaces
Metasurfaces have drawn considerable attentions for their revolutionary capability of tailoring the amplitude, phase, and polarization of light. By integrating the nonlinear optical processes into metasurfaces, new wavelengths are introduced as an extra degree of freedom for further advancing the device performance. However, most of the existing nonlinear plasmonic metasurfaces are based on metallic nanoantennas as meta-atoms, suffering from strong background transmission, low laser damage threshold and small nonlinear conversion efficiency. Here, Babinet-inverted plasmonic metasurfaces made of C-shaped nanoapertures as meta-atoms are designed and demonstrated to solve these issues. Rotation-gradient nonlinear metasurfaces are further constructed for producing spin-selective second-harmonic vortex beams with the orbital angular momentum (OAM) and beam diffraction angle determined by both the spin states of the fundamental wave and second-harmonic emission. The results enable new types of functional metasurface chips for applications in spin, OAM, and wavelength multiplexed optical trapping, all-optical communication, and optical data storage.
Y. Chen et al., "Spin-Selective Second-Harmonic Vortex Beam Generation with Babinet-Inverted Plasmonic Metasurfaces," Advanced Optical Materials, vol. 6, no. 19, Wiley-VCH, Oct 2018.
The definitive version is available at https://doi.org/10.1002/adom.201800646
Mechanical and Aerospace Engineering
Intelligent Systems Center
Keywords and Phrases
Angular momentum; Atom lasers; Degrees of freedom (mechanics); Digital storage; Harmonic analysis; Harmonic generation; Laser damage; Metamaterials; Optical communication; Optical data storage; Plasmonics; Plasmons; Vortex flow; All-optical communication; Device performance; Laser damage threshold; Metasurfaces; Nano-apertures; Nonlinear optical process; Orbital angular momentum; Second-harmonic emission; Nonlinear optics; Plasmonic nanoapertures; Second-harmonic generation
International Standard Serial Number (ISSN)
Article - Journal
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01 Oct 2018