Elliptical polarization in VCSELs via joint interaction of a tilted sub-wavelength grating and intrinsic semiconductor anisotropies

• DOI: 10.1364/ol.557703
• Publication Date: 2025-04-08T13:01:34Z
• Authors: Valerio Torrelli; Lorenzo Miri; Martino D’Alessandro; Alberto Gullino; Michael Zimmer; Katharina Dahler; Michael Jetter; Peter Michler; Wolfgang Elsäßer; Francesco Bertazzi; Alberto Tibaldi; Pierluigi Debernardi

We demonstrate numerically and experimentally that, in vertical-cavity surface-emitting lasers (VCSELs), a non-chiral cavity can be converted into chiral one by the interaction between sub-wavelength grating tilted with respect to crystalline axes intrinsic semiconductor optical anisotropies, thus enabling emission of elliptically polarized light. The measured Stokes parameters such VCSEL, realized standard based VCSEL fabricati on process, are line modeling results. through simulations that degree circular polarization 0.9 obtained varying parameters. full Poincaré sphere is accessible demand if mechanical strain also considered.