Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots

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-$Q$ ($>10^5$) microdisks using cavity-resonant, pulsed excitation.

References in corpus (11)

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Cited by in corpus (4)

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• Near-infrared Hong-Ou-Mandel interference on a silicon quantum photonic circuit
• Polarons Explain Luminescence Behavior of Colloidal Quantum Dots at Low Temperature
• Overcoming Auger recombination in nanocrystal quantum dot laser using spontaneous emission enhancement