Polarization control and tuning efficiency of tunable vertical-cavity surface-emitting laser with internal-cavity sub-wavelength grating
Wang Xiao-Long, Zou Yong-Gang, He Zhi-Fang, Liu Guo-Jun, Ma Xiao-Hui §
       

Sub-wavelength grating structure. GaAs is the grating material, Λ is the period, H is the depth, a is the ridge width, and f = a/Λ is the duty cycle.