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

Published

Author(s)

Matthew T. Rakher, Ranojoy Bose, Chee Wei Wong, Kartik A. Srinivasan

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

Keywords

photonic crystals, microcavities, quantum dots, spectroscopy
Created April 23, 2010, Updated February 19, 2017