Joly Alexandre, Baili Ghaya, George Jean-Marie, Sagnes Isabelle, Dolfi Daniel, Alouini Mehdi
Opt Lett. 2024 Jun 1;49(11):3010-3013. doi: 10.1364/OL.522095.
We report the enhancement of spin injection efficiency in an external-cavity VCSEL based on a non-resonant pumping coupled with a polarized optical resonant illumination. This double pumping scheme allows both the injection of spin polarized electrons in the conduction band and the selection of the spin orientation for the electron/hole recombination laser process. Experimentally, a flip of the polarization state of the laser is achieved with an ellipticity of +31° (spin down) and -33° (spin up), so an increase of about 50% of the ellipticity is achieved in comparison to an optical non-resonant pumping alone.
我们报道了基于非共振泵浦与偏振光共振照明相结合的外腔垂直腔面发射激光器（VCSEL）中自旋注入效率的提高。这种双泵浦方案既允许在导带中注入自旋极化电子，又能为电子/空穴复合激光过程选择自旋取向。实验上，实现了激光偏振态的翻转，椭圆率分别为 +31°（自旋向下）和 -33°（自旋向上），因此与单独的光学非共振泵浦相比，椭圆率提高了约50%。
