TITLE

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

AUTHOR(S)
Rakher, M. T.; Bose, R.; Wong, C. W.; Srinivasan, K.
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/19/2010, Vol. 96 Issue 16, p161108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
49807484

 

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