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AFM image of the surface of the printed NC-titania waveguide. The transferred second order DFB grating provides feedback to demonstrate lasing. Grating depth and spacing are 50 and , respectively.
(a) Linear PL spectrum (stars), below threshold, of a titania waveguide incorporating radius core-shell NCs; development of the biexciton ASE peak (circles) above threshold on the red side of the linear PL spectrum; simultaneous ASE (squares) at higher excitation power; note that the amplitude of the second peak is identical to that of the biexciton at that particular stripe length. (b) Power dependence of the integrated area under the first and second ASE peaks; the development of ASE from the state does not affect the biexcitonic ground state ASE; top scale indicates the mean number of pairs injected in each NC immediately after the excitation pulse.
Variable stripe length measurements performed on an unprinted slab guide: (a) Biexciton and ASE intensities at (diamonds) and ASE at (squares), respectively. (b) modal gain profile of the slab guide device.
(a) Lasing spectra of the surface emitting DFB laser when the grating stop band is matched with the biexcitonic ASE peaks, (b) lasing from the electronic state at a different detection angle than (a), the peak at originates from the scattered biexcitonic ASE.
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