Spectroscopy of 1.55μm PbS quantum dots on Si photonic crystal cavities with a fiber taper waveguide

Rakher, M. T.; Bose, R.; Wong, C. W.; Srinivasan, K.
April 2010
Applied Physics Letters;4/19/2010, Vol. 96 Issue 16, p161108
Academic Journal
We use an optical fiber taper waveguide to probe PbS quantum dots (QDs) dried on Si photonic crystal cavities near 1.55μm. We demonstrate that a low density (<=100 μm-2) of QDs does not significantly degrade cavity quality factors as high as ≈3×104. We also show that the tapered fiber can be used to excite the QDs and collect the subsequent cavity-filtered photoluminescence, and present measurements of reversible photodarkening and QD saturation. This method represents an important step toward spectroscopy of single colloidal QDs in the telecommunications band.


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