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HL: Fachverband Halbleiterphysik
HL 14: Nanophotonics - Devices II (Focused Session with DS)
HL 14.7: Topical Talk
Montag, 22. März 2010, 17:15–17:45, H2
Long-Wavelength Vertical-Cavity Surface-Emitting Lasers with a High-Contrast Grating — •Werner Hofmann — Technische Universität Berlin
Long-wavelength Vertical-Cavity Surface-Emitting Lasers (VCSELs) based on a subwavelength high-contrast gratings (HCGs) as output mirrors have been realized for the first time. By design, these devices are highly polarization stable, single-mode at large apertures and solve the VCSEL-mirror problem at long wavelengths in an elegant way. The device is grown on an InP substrate, incorporating a BTJ for a low electrical and optical losses and avoiding p-material. A hybrid reflector is used as bottom-mirror and the light is coupled out via the HCG reflector. With cost effective mass-fabrication in mind, the top HCG reflector consists of amorphous silicon on isolator. The single-mode laser emission is tailored to be around 1320 nm wavelength targeting applications in high-speed optical data transmission, especially for passive optical networks. The device is manufactured in a low parasitics, high-speed design, good for bandwidths well above 10 GHz. We report single-mode emission for devices with apertures as large as 11 µm operating continuous wave with output-powers in excess of 0.4 mW. Pulsed operation with output powers up to 4 mW at room temperature is demonstrated as well. This is the first electrically pumped VCSEL structure realized in this wavelength regime utilizing an HCG mirror.
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