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Photonic Bound States in the Continuum in Si Structures with the Self‐Assembled Ge Nanoislands
Author(s) -
Dyakov Sergey A.,
Stepikhova Margarita V.,
Bogdanov Andrey A.,
Novikov Alexey V.,
Yurasov Dmitry V.,
Shaleev Mikhail V.,
Krasilnik Zakhary F.,
Tikhodeev Sergei G.,
Gippius Nikolay A.
Publication year - 2021
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000242
Subject(s) - photoluminescence , photonic crystal , quantum dot , optoelectronics , scattering , photonics , germanium , silicon , q factor , materials science , physics , hexagonal lattice , condensed matter physics , optics , resonator , antiferromagnetism
Abstract 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.