Time resolved measurements on low-density single quantum dots at 1300nm
C. Zinoni, B. Alloing, C. Monat, L. H. Li, L. Lunghi, A. Gerardino and, A. Fiore
TL;DR
This paper reports on time-resolved and integrated optical measurements of single In/As quantum dots emitting at 1300nm, revealing exciton dynamics, spectral signatures, and background emission effects at low temperature.
Contribution
It provides new detailed time-resolved photoluminescence data on single quantum dots at telecom wavelength, including effects of excitation power and temperature.
Findings
Identification of standard spectroscopic signatures of single QDs
Measurement of exciton and biexciton properties
Observation of background emission delaying PL
Abstract
We present time integrated and time resolved measurements on single In/As quantum dots (QD) emitting at 1300nm, at 10K, embedded in a planar microcavity. We clearly identify a standard spectroscopic signature from single QDs and compare the exciton line width and biexciton (BX) binding energy for several QDs. We present this data for QDs spatially selected by etched mesas and metallic apertures. Time resolved photoluminescence (PL) from single electron-hole recombination in the ground state of the QD is investigated as a function of excitation power and temperature. The measurements reveal the presence of a background emission that delays the PL of excitons in the ground state.
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