A Novel Method for Fabrication of Free Standing Subwavelength Gratings in Gaas/Algaas

TitleA Novel Method for Fabrication of Free Standing Subwavelength Gratings in Gaas/Algaas
Publication TypeConference Paper
Year of Publication2006
AuthorsTan, D. T. H., B. Faraji, N. Zangenberg, T. Tiedje, L. Chrostowski, E. Bisaillon, and D. V. Plant
Conference NameElectrical and Computer Engineering, 2006. CCECE '06. Canadian Conference on
Pagination2152 -2155
Date Publishedmay.
Keywordsaluminium compounds, aspect ratio, Diffraction gratings, fracture, freestanding GaAs grating, GaAs-AlGaAs, gallium arsenide, high reflectivity mirror, III-V semiconductors, laser cavity resonators, laser mirrors, optical fabrication, reflectivity, stiction, subwavelength grating fabrication, surface emitting lasers, surface tension, vertical cavity laser

We demonstrate a method for the fabrication of suspended gratings in GaAs/AlGaAs. These gratings are designed to act as high reflectivity mirrors in vertical cavity lasers. The fabrication process used is simple, and with a high yield. Stiction or fracture due to surface tension as well as stiction of grating fingers to one another is circumvented. In particular, we found that in fabrication of freestanding GaAs gratings on a submicron scale, wet processes performed after the definition of the gratings greatly reduces the yield. Contrary to the normal fabrication sequence, the wet sacrificial etch is performed prior to defining the gratings. The process is also useful in producing other high aspect ratio structures


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