Vortex Laser based on III-V semiconductor metasurface: direct generation of coherent Laguerre-Gauss modes carrying controlled orbital angular momentum.
Sci Rep
; 6: 38156, 2016 12 05.
Article
em En
| MEDLINE
| ID: mdl-27917885
ABSTRACT
The generation of a coherent state, supporting a large photon number, with controlled orbital-angular-momentum L = hl (of charge l per photon) presents both fundamental and technological challenges we demonstrate a surface-emitting laser, based on III-V semiconductor technology with an integrated metasurface, generating vortex-like coherent state in the Laguerre-Gauss basis. We use a first order phase perturbation to lift orbital degeneracy of wavefunctions, by introducing a weak anisotropy called here "orbital birefringence", based on a dielectric metasurface. The azimuthal symmetry breakdown and non-linear laser dynamics create "orbital gain dichroism" allowing selecting vortex handedness. This coherent photonic device was characterized and studied, experimentally and theoretically. It exhibits a low divergence (<1°) diffraction limited beam, emitting 49 mW output power in the near-IR at λ ≃ 1 µm, a charge l = ±1,
±4 (>50 dB vortex purity), and single frequency operation in a stable low noise regime (0.1% rms). Such high performance laser opens the path to widespread new photonic applications.
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MEDLINE
Idioma:
En
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Sci Rep
Ano de publicação:
2016
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Article
País de afiliação:
França