Room temperature 1.3–1.55 μm laser-like emission from Ge/Si self-assembled islands in Si-based photonic crystals
作者： J-M. Lourtioz , S. David , M. El Kurdi , C. Kammerer , X. Li
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摘要: Experimental results are reported on various guided optic configurations that combine silicon-based photonic crystals (PC) and Ge/Si quantum island emitters. The feasibility of low-refractive-index-contrast PC waveguides by inductively-coupled-plasma (ICP) etching buried SiGe/Si is briefly recalled from a previous work. main body the paper focused experiments were carried out high-refractive-index-contrast silicon-on-insulator (SOI) system. Self-assembled layers deposited SOI substrate was further processed to get two-dimensional microcavities waveguides. room temperature 1.3–1.55 μm emission islands shown be significantly enhanced in microcavities, strongest enhancement being obtained with smallest (micropillar-like) cavities surrounded wide pores. In this latter case, room-temperature photoluminescence amplitude more than two-orders magnitude larger grown unprocessed samples. A superlinear (laser-like) dependence optical pumping observed same time. This behavior other experimental trends would incriminate both high carrier concentration photo-created electron-hole plasma good vertical coupling efficiency micro-structured silicon. first attempt characterize linear also using wideband luminescence embedded guides.
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