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Tunable Whispering Gallery Mode Emission from Quantum‐Dot‐Doped Microspheres
Author(s) -
Gómez Daniel E.,
PastorizaSantos Isabel,
Mulvaney Paul
Publication year - 2005
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200400019
Subject(s) - whispering gallery wave , quantum dot , materials science , microsphere , doping , fluorescence , nanocrystal , nanotechnology , refractive index , optoelectronics , polyelectrolyte , optics , chemical engineering , composite material , polymer , resonator , physics , engineering
We describe the synthesis of quantum‐dot (QD) doped silica microspheres and a method by which it is possible to fine‐tune the position of the whispering gallery modes (WGMs) produced by the fluorescence emission of CdSe@ZnS doped silica microspheres (5.06 μm in diameter). The method is based on small perturbations to the sphere's refractive index caused by adsorption of thin layers of polyelectrolytes and modification of the radial position of the nanocrystals within the microsphere by means of deposited silica shells.