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Room-temperature absorption spectra of QD-doped glasses with mean QD radii . The solid line represents the sample in which the ion-exchange waveguides have been fabricated. The small absorption feature around is also present in the host glass without QDs.
(a) Ion-exchange process and (b) a phase-contrast micrograph of two QD-doped channel waveguides after ion exchange .
(a) Near-field image of the mode profile along with its (b) horizontal ( width) and (c) vertical ( width) cross sections at from a channel waveguide ( mask opening). The mode was collected using a objective and imaged onto a NIR camera. The mode profile is asymmetric since these are surface waveguides.
Index profile of a channel ( QD-doped) waveguide measured by the RNF technique at . With exchange, one expects a ridge at the surface; however, the dip here is due to the harsh etching process we used to completely remove the titanium mask. The width of the index profile increased with increasing mask opening.
Luminescence from QD-doped waveguides (solid) and in this glass before (dotted) and after (dashed) ion exchange along with the QD absorption (open circles). The noise in waveguide spectrum around is due to scattered pump light.
Propagation, guide, coupling, and ideal coupling losses for ion-exchanged waveguides.
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