| 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: |
 Click here to retrieve PDF version of paper (472KB) |
