2 research outputs found
Transient Reflection: A Versatile Technique for Ultrafast Spectroscopy of a Single Quantum Dot in Complex Environments
Increasingly complex structures such as optical antennas
or cavities
are coupled to self-assembled quantum dots to harvest their quantum-optical
properties. In many cases, these structures pose a problem for common
methods of ultrafast spectroscopy used to write and read out the state
of the quantum dot. We present a pure far-field method that only requires
optical access to the quantum dot and does not impose further restrictions
on sample design. We demonstrate Rabi oscillations and perturbed free
induction decay of single GaAs quantum dots that have a dipole moment
as small as 18 D. Our method will greatly facilitate ultrafast spectroscopy
of complex quantum-optical circuits
Eleven Nanometer Alignment Precision of a Plasmonic Nanoantenna with a Self-Assembled GaAs Quantum Dot
Plasmonics
offers the opportunity of tailoring the interaction
of light with single quantum emitters. However, the strong field localization
of plasmons requires spatial fabrication accuracy far beyond what
is required for other nanophotonic technologies. Furthermore, this
accuracy has to be achieved across different fabrication processes
to combine quantum emitters and plasmonics. We demonstrate a solution
to this critical problem by controlled positioning of plasmonic nanoantennas
with an accuracy of 11 nm next to single self-assembled GaAs semiconductor
quantum dots, whose position can be determined with nanometer precision.
These dots do not suffer from blinking or bleaching or from random
orientation of the transition dipole moment as colloidal nanocrystals
do. Our method introduces flexible fabrication of arbitrary nanostructures
coupled to single-photon sources in a controllable and scalable fashion