Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000242
Keywords
bound state in the continuum; germanium self-assembled quantum dot; photoluminescence enhancement; photonic crystal slab
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Funding
- Russian Science Foundation [16-12-10538, 19-72-10011]
- BASIS foundation
- Grant of the President of the Russian Federation [MK-2224.2020.2]
- Russian Science Foundation [19-72-10011] Funding Source: Russian Science Foundation
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Germanium self-assembled nanoislands and quantum dots show great potential for CMOS-compatible optoelectronic integrated circuits, but their photoluminescence intensity is currently lacking. Experimental results demonstrate that the photoluminescence of Ge nanoislands in silicon photonic crystal slabs with hexagonal lattice can be dramatically enhanced, paving the way for a new class of optoelectronic components compatible with silicon technology.
Germanium self-assembled nanoislands and quantum dots are very prospective for CMOS-compatible optoelectronic integrated circuits but their photoluminescence (PL) intensity is still insufficient for many practical applications. Here, it is demonstrated experimentally that the PL of Ge nanoislands in silicon photonic crystal slabs (PCS) with hexagonal lattice can be dramatically enhanced due to the involvement in the emission process of the bounds states in the continuum. These high-Q photonic resonances allow to achieve PL resonant peaks with the quality factor as high as 2200 and with the peak PL enhancement factor of more than two orders of magnitude. The corresponding integrated PL enhancement is demonstrated to be more than one order of magnitude. This effect is studied theoretically by the Fourier modal method in the scattering matrix form. The symmetry of the quasi-normal guided modes in the PCS is described in terms of group theory. This work paves the way toward a new class of optoelectronic components compatible with silicon technology.
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