Abstract
In this work we analyze numerically and experimentally new active waveguides
based on a bilayer structure composed by a passive polymer and an active poly(mehtyl
methacrylate) (PMMA) film doped with CdSe colloidal quantum dots (QDs), namely a
nancomposite. In a first bilayer structure a planar PMMA layer is deposited on top of
the nanocomposite, where the signal beam intensity is enhanced because this cladding
layer is able to collect radiated emission of QDs. Moreover, the pump beam is also
propagating through the cladding without limitation by QD absorption. These results are
extended to a second bilayer structure, where ridge patterns of a commercially available
resist (SU-8) are deposited on the top of the nanocomposite active layer. These SU-8
patterns are also able to guide with low absorption losses both pump and signal beams.
The optimum geometrical parameters of the bilayer structures were properly designed to
optimize the light waveguiding, previous to their fabrication and optical
characterization. For this purpose, a spontaneous emission model has been developed and
programmed into an active beam propagation method. This technology can be the base for
developing integrated photonics on silicon at visible and telecom
wavelengths.
© 2013 IEEE
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