Supplement 1: Metasurface quantum-cascade laser with electrically switchable polarization XuLuyao ChenDaguan CurwenChristopher A. MemarianMohammad RenoJohn L. ItohTatsuo WilliamsBenjamin S. 2017 Supplementary material Originally published in Optica on 20 April 2017 (optica-4-4-468)