Peer-Reviewed Journal Details
Mandatory Fields
Dylewicz, R. and Patela, S. and Hogg, R. A. and Fry, P. W. and Parbrook, P. J. and Airey, R. and Tahraoui, A.;
Journal Of Electronic Materials
Low-Dimensional Waveguide Grating Fabrication in GaN with Use of SiCl4/Cl-2/Ar-Based Inductively Coupled Plasma Dry Etching
Optional Fields
Optimized fabrication of submicron-sized features in gallium nitride (GaN) with the use of inductively coupled plasma (ICP) dry etching, based on SiCl4/Cl-2/Ar gas mixture, is presented. Dense periodic patterns, i.e., 400-nm-period gratings, were transferred into a gallium nitride waveguide under different etching conditions. ICP power, radiofrequency (RF) power, chamber pressure, and Ar/Cl-2 gas mixing ratio were altered during the experiment. Depths of fabricated grating couplers up to 670 nm were achieved. The most suitable etching conditions are discussed with the assessment based on etching selectivity, scanning electron microscopy (SEM) observation of grating tooth slope, hard-mask erosion process, and etched surface morphology.
Grant Details