Low-loss III-V photonics and high efficiency grating couplers incorporating low-index AlOx layers

A SGC with 30% coupling efficiency is designed for a QD-GaAs-based optoelectronics integration platform using thin oxidized Al
0.98
Ga
0.02
As layers to overcome the otherwise poor refractive index contrast. coupling efficiency increased from 10% for the unoxidized equivalent and is suitable for outcoupling in active-passive integrated platforms.