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Whispering gallery mode emission at telecommunications-window wavelengths using PbSe nanocrystals attached to photonic beads

C.E.Finlayson1,4, P.J.A.Sazio1, R.Sanchez-Martin2, M.Bradley2, T.A.Kelf3 and J.J.Baumberg3

1. Optoelectronics Research Centre (ORC), University of Southampton, UK
2. School of Chemistry, University of Edinburgh, Edinburgh, EH9 3JJ, UK
3. School of Physics and Astronomy, University of Southampton, UK

Abstract

We report the selective chemical attachment of infrared emitting PbSe nanocrystal quantum dots onto micron-scale glass photonic beads. Upon optical excitation, photoluminescence from the shell of nanocrystals is seen to couple into the high-Q 'whispering gallery' modes of the bead via the evanescent optical field, resulting in a series of sharp peaks being observed at wavelengths of around 1550 nm. Theoretical modelling gives a close agreement with the data for angular modes corresponding to l ~ 120. This work demonstrates the potential of narrow-bandgap II–VI semiconductor nanocrystals for use in a wide range of telecommunications-window photonics applications.


Semiconductor Science and Technology (2006) Vol.21(3) pp.L21-L24

doi: 10.1088/0268-1242/21/3/L01

Southampton ePrint id: 19152

 

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Copyright University of Southampton 2006