Browsing by Author "Kasten, Ansas M."
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Item Metadata only Etch damage and deposition repair of vertical-cavity surface-emitting lasers(American Vacuum Society, 2006-01-01) Leisher, Paul O.; Raftery, James J.; Kasten, Ansas M.; Choquette, Kent D.Dielectric layers are often employed as etch masks for mesa and trench structures during vertical-cavity surface-emitting laser (VCSEL) fabrication. The removal of these mask layers by reactive ion etching results in unavoidable exposure of the top laser facet to sputtering. This sputtering is experimentally shown to impact the device performance. After a thickness of less than a quarter wavelength (∼60nm) has been removed, the VCSELs are no longer able to achieve lasing threshold. Simulation indicates that the reason for this is a decrease in quality factor by more than an order of magnitude. Consistent with this explanation is that the damage can be partially repaired (allowing laser oscillation) by depositing SiO2 to compensate for the missing semiconductor material.Item Metadata only Mode Control in Photonic Crystal Vertical-Cavity Surface-Emitting Lasers and Coherent Arrays(Institute of Electrical and Electronics Engineers (IEEE), 2009-05) Siriani, Dominic F.; Peun Tan, Meng; Kasten, Ansas M.; Leisher, Paul O.; Sulkin, Joshua D.; Raftery, James J.; Danner, Aaron J.; Giannopoulos, Antonios V.; Choquette, Kent D.We demonstrate transverse mode control in vertical-cavity surface-emitting lasers (VCSELs) and 2-D VCSEL arrays. By etching a periodic arrangement of circular holes into the top distributed Bragg reflector mirror, we are able to control the lasing modes through index and loss confinement. Theoretical modeling of these confinement effects are shown to be consistent with experimental measurements. Photonic crystal etched patterns and ion-implanted photonic lattices have been employed to fabricate coherently-coupled 2-D arrays. Control of the array supermodes from the out-of-phase and in-phase conditions is discussed. Designs of photonic crystal coherent VCSEL arrays for high-power emission and beam steering applications are described.Item Metadata only Single Mode Photonic Crystal Vertical Cavity Surface Emitting Lasers(Hindawi Limited, 2012-02-14) Choquette, Kent D.; Siriani, Dominic F.; Kasten, Ansas M.; Tan, Meng Peun; Sulkin, Joshua D.; Leisher, Paul O.; Raftery, James J.; Danner, Aaron J.We review the design, fabrication, and performance of photonic crystal vertical cavity surface emitting lasers (VCSELs). Using a periodic pattern of etched holes in the top facet of the VCSEL, the optical cavity can be designed to support the fundamental mode only. The electrical confinement is independently defined by proton implantation or oxide confinement. By control of the refractive index and loss created by the photonic crystal, operation in the Gaussian mode can be insured, independent of the lasing wavelength.