| Autor: |
Petykiewicz J; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Nam D; Department of Electronic Engineering, Inha University , Incheon 402-751, South Korea., Sukhdeo DS; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Gupta S; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Buckley S; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Piggott AY; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Vučković J; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States., Saraswat KC; Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States. |
| Abstrakt: |
A silicon-compatible light source is the final missing piece for completing high-speed, low-power on-chip optical interconnects. In this paper, we present a germanium nanowire light emitter that encompasses all the aspects of potential low-threshold lasers: highly strained germanium gain medium, strain-induced pseudoheterostructure, and high-Q nanophotonic cavity. Our nanowire structure presents greatly enhanced photoluminescence into cavity modes with measured quality factors of up to 2000. By varying the dimensions of the germanium nanowire, we tune the emission wavelength over more than 400 nm with a single lithography step. We find reduced optical loss in optical cavities formed with germanium under high (>2.3%) tensile strain. Our compact, high-strain cavities open up new possibilities for low-threshold germanium-based lasers for on-chip optical interconnects. |
