Planar focusing reflectors based on high contrast gratings

Vertical cavity surface emitting lasers (VCSELs) attract a lot of attention due to steadily growing demand for radiation emitters that are used in the short- and middle-range networks aimed at high-speed data transfer. Two... [ view full abstract ]

Vertical cavity surface emitting lasers (VCSELs) attract a lot of attention due to steadily growing demand for radiation emitters that are used in the short- and middle-range networks aimed at high-speed data transfer. Two Distributed Bragg Reflectors (DBRs), composed of alternating layers of materials repeated many times occupy major part of the laser volume. DBRs are located on both sides of an active region and form a resonant cavity of a VCSEL. In principle, planar reflectors based on a High Contrast Grating (HCG) may substitute at least one DBR in a VCSEL leading to simplification of the laser structure due to the fact that an HCG is around ten times thinner compared to a DBR.

We will present the simulations of GaAs-based focusing HCGs designed for 980 nm. In particular, we will compare the performance of three types of HCG-based reflectors, namely, a membrane from GaAs suspended in the air, a GaAs-based HCG embedded in oxidation, and a monolithic HCG from GaAs.

The project (Homing/2017-4/34) is carried out within the HOMING programme of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund.