Two-dimensional photonic crystals increasing vertical light emission from Si nanocrystal-rich thin layers

0500997 - FZÚ 2019 RIV DE eng J - Journal Article
Ondič, Lukáš - Varga, Marián - Pelant, Ivan - Kromka, Alexander - Hruška, Karel - Elliman, R. G.
Two-dimensional photonic crystals increasing vertical light emission from Si nanocrystal-rich thin layers.
Beilstein Journal of Nanotechnology. Roč. 9, č. 1 (2018), s. 2287-2296. ISSN 2190-4286. E-ISSN 2190-4286
R&D Projects: GA ČR GJ16-09692Y
Institutional support: RVO:68378271
Keywords : leaky modes * photoluminescence * photonic crystals * silicon nanocrystals
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.269, year: 2018

We have fabricated two-dimensional photonic crystals (PhCs) on the surface of Si nanocrystal-rich SiO2 layers with the goal to maximize the photoluminescence extraction efficiency in the normal direction. The fabricated periodic structures consist of columns ordered into square and hexagonal pattern with lattice constants computed such that the red photoluminescence of Si nanocrystals (SiNCs) could couple to leaky modes of the PhCs and could be efficiently extracted to surrounding air. Samples having different lattice constants and heights of columns were investigated in order to find the configuration with the best performance. The extraction enhancement within different spatial angles was evaluated by means of micro-photoluminescence spectroscopy. More than 18-fold extraction enhancement was achieved for light propagating in the normal direction and up to 22% increase in overall intensity was obtained at the spatial collection angle of 14°.
Permanent Link: http://hdl.handle.net/11104/0293023