Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots
Mesoscale and Nanoscale Physics
2011-03-21 v1 Optics
Quantum Physics
Abstract
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- () microdisks using cavity-resonant, pulsed excitation.
Cite
@article{arxiv.1012.0225,
title = {Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots},
author = {Matthew T. Rakher and Ranojoy Bose and Chee Wei Wong and Kartik Srinivasan},
journal= {arXiv preprint arXiv:1012.0225},
year = {2011}
}