Finlayson, C.E., Sazio, P.J.A., Sanchez-Martin, R., Bradley, M., Kelf, T. and Baumberg, J.J.
Whispering gallery mode emission at telecommunications-window wavelengths using PbSe nanocrystals attached to photonic beads
Semiconductor Science and Technology, 21, (3), . (doi:10.1088/0268-1242/21/3/L01).
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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.
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