Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 18, Issue 6, Pages 1830-1838Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2012.2206802
Keywords
Ge self-assembled quantum dots (QDs); Light-emitting device; microdisk; microring; photonic crystal (PhC) nanocavity; Purcell effect
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Funding
- MEXT
- MEXT, Japan [21246003]
- Grants-in-Aid for Scientific Research [21246003] Funding Source: KAKEN
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Highly efficient light-emitting devices operating in 1.3-1.6 mu m wavelength range are realized by combining optical cavities and Ge self-assembled quantum dots (QDs) grown on SOI wafers by molecular beam epitaxy (MBE). Different types of optical cavities, including photonic crystal (PhC) nanocavities, microdisks, and microrings, are fabricated to enhance the light emission efficiency at room temperature. Sharp resonant peaks with Q-factor on the order of 10(3) are observed in the micro-photoluminescence (mu PL) spectrum. Through numerical simulation, these peaks are well identified as the corresponding cavity modes. The emission performances of these devices are also investigated by performing pumping-power- and geometric-parameter-dependent mu PL measurements. The resonant wavelength, Q-factor, and emission intensity can be easily manipulated by these parameters.
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