Vortex Laser based on III-V semiconductor metasurface: direct generation of coherent Laguerre-Gauss modes carrying controlled orbital angular momentum
書誌事項
- 公開日
- 2016-12-05
- 権利情報
-
- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
-
- 10.1038/srep38156
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>The generation of a coherent state, supporting a large photon number, with controlled orbital-angular-momentum <jats:italic>L</jats:italic> = <jats:italic>ħl</jats:italic> (of charge <jats:italic>l</jats:italic> 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 <jats:italic>mW</jats:italic> output power in the near-IR at <jats:italic>λ</jats:italic> ≃ 1 <jats:italic>μm</jats:italic>, a charge <jats:italic>l</jats:italic> = ±1, … ±4 (>50 <jats:italic>dB</jats:italic> 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.</jats:p>
収録刊行物
-
- Scientific Reports
-
Scientific Reports 6 (1), 38156-, 2016-12-05
Springer Science and Business Media LLC
