Open AccessSpontaneous emission modulation of colloidal quantum dots via efficient coupling with hybrid plasmonic photonic crystal
Author(s) -
Xiaohui Yuan,
Lei Shi,
Qi Wang,
C. Q. Chen,
X. H. Liu,
Liaoxin Sun,
Bo Zhang,
Jian Zi,
Wei Lü
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.023473
Subject(s) - spontaneous emission , materials science , photonic crystal , photoluminescence , quantum dot , optoelectronics , plasmon , purcell effect , optics , excited state , surface plasmon , refractive index , surface plasmon resonance , photonics , crystal (programming language) , emission spectrum , laser , spectral line , nanoparticle , physics , nanotechnology , atomic physics , astronomy , computer science , programming language
The spontaneous emission of colloidal CdSe/ZnS quantum dots (CQDs) modified by the hybrid plasmonic-photonic crystal is reported in this paper. By using a spin coater, the spatial overlap between CQDs and the surface resonance modes in this quasi-2D crystal slab is achieved. In this case, the coupling efficiency of them is enhanced greatly and most excited CQDs radiate through the surface modes. Consequently, despite the low refractive index contrast of our hybrid structure, the directionality of spontaneous emission, increased radiative probability and narrowed full width at half maximum of emission peak are all clearly observed by our home-made microscopic angle-resolved spectroscopy and time-resolved photoluminescence system. Our results manifest that the quasi-2D hybrid plasmonic-photonic crystal is an ideal candidate to tailor the radiative properties of CdSe/ZnS CQDs, which might be significant for the applications of light emitting devices.