High-Index-Contrast Grating (HCG) and Its Applications in Optoelectronic Devices

摘要

We review recent advances in subwavelength high-index-contrast gratings (HCGs) and a variety of applications in optoelectronic devices, including vertical-cavity surface-emitting lasers (VCSELs), tunable VCSELs, high-$Q$ optical resonators, and low-loss hollow-core waveguides (HWs). HCGs can serve as broadband ($Delta$ $lambda$/$lambda$ $sim$ 35%), high-reflectivity (≫99%) mirrors for surface-normal incident light, which is useful to replace conventional distributed Bragg reflectors in optical devices. HCGs can also be designed as high-$Q$ resonators with output coupling in the surface-normal direction. Finally, we discuss a novel design of HCG as shallow angle reflectors and HWs.