Direct Bandgap Light Emission from Strained Germanium Nanowires Coupled with High-Q Nanophotonic Cavities
| Autor: | Sonia Buckley, Shashank Gupta, Alexander Y. Piggott, Krishna C. Saraswat, Donguk Nam, Jan Petykiewicz, David S. Sukhdeo, Jelena Vuckovic |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Active laser medium
Materials science Photoluminescence Nanophotonics Nanowire chemistry.chemical_element Bioengineering Germanium 02 engineering and technology 01 natural sciences law.invention 010309 optics law 0103 physical sciences General Materials Science Lithography business.industry Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Laser chemistry Optoelectronics Light emission 0210 nano-technology business |
| Zdroj: | Nano Letters. 16:2168-2173 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.5b03976 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|