Journal
OPTICS EXPRESS
Volume 19, Issue 3, Pages 1786-1793Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.001786
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Funding
- NSF [ECCS 0747787]
- Nanoscale Science and Engineering Initiative [CHE-0641523]
- New York State Office of Science, Technology, and Innovation
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PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices in the telecommunications-band. Measurements of low quantum dot densities are limited both because of low fluorescence levels and the challenges of single photon detection at these wavelengths. Here, we report on methods using a fiber taper waveguide to efficiently extract PbS quantum dot photoluminescence. Temperature dependent ensemble measurements reveal an increase in emitted photons concomitant with an increase in excited-state lifetime from 58.9 ns at 293 K to 657 ns at 40 K. Measurements are also performed on quantum dots on high-Q (> 10(5)) microdisks using cavity-resonant, pulsed excitation. (C) 2011 Optical Society of America
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