期刊
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
卷 34, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6641/aaf7a7
关键词
Ge(Si) self-assembled nanoislands; photonic crystals; micro-photoluminescence; slow-light modes; L3 cavity
类别
资金
- Russian Academy of Sciences
- Russian Foundation for Basic Research [18-42-520047_r-a]
- Russian Science Foundation [14-22-00143]
- Federal Ministry for Education and Research ('Bundesministerium fur Bildung und Forschung') within the Centre for Innovation Competence SiLi-Nano [03Z2HN12]
Luminescent properties of self-assembled Ge(Si)/SOI nanoislands embedded in two-dimensional photonic crystal (PhC) slabs with and without L3 cavities were studied with PhC period a varied between 350 and 600 nm. For small periods (a <= 450 nm), the nanoisland luminescence, which spans over the wavelength range from 1.2 to 1.6 mu m, overlaps with the PhC bandgap resulting in a coupling with the localized modes of an L3 cavity. It is shown that for larger periods (a > 450 nm), nanoisland emission couples to the radiative modes above the bandgap located in the vicinity of the Gamma-point of the photonic crystal Brillouin zone and is characterized by the low group velocity. In this case, a significant (up to 35-fold) increase in the PL intensity was observed in a number of PhCs without a cavity. From a technological point of view, the latter result makes such types of photonic crystal structures particularly promising for the realization of Si-based light emitters operating in the telecommunication wavelength range because, firstly, their manufacture does not require a precise cavity formation and, secondly, they provide a much larger area for the radiating region, as compared with PhC cavities.
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