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Publication Citation: Spectroscopy of 1.55 υm PbS Quantum Dots on Si Photonic Crystal Cavities with a Fiber Taper Waveguide

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Author(s): Matthew T. Rakher; Ranojoy Bose; Chee Wei Wong; Kartik A. Srinivasan;
Title: Spectroscopy of 1.55 υm PbS Quantum Dots on Si Photonic Crystal Cavities with a Fiber Taper Waveguide
Published: April 23, 2010
Abstract: We use an optical fiber taper waveguide to probe PbS quantum dots (QDs) dried on Si photonic crystal cavities near 1.55 υm. We demonstrate that a low density ({less than or equal to} 100υm-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 towards spectroscopy of single colloidal QDs in the telecommunications band.
Citation: Applied Physics Letters
Volume: 96
Pages: 3 pp.
Keywords: photonic crystals; microcavities; quantum dots; spectroscopy
Research Areas: Nanophotonics
PDF version: PDF Document Click here to retrieve PDF version of paper (484KB)