Measurement of exciton fraction of microcavity exciton-polaritons using transfer-matrix modeling
arxiv(2024)
Abstract
We present a careful calibration of the exciton fraction of polaritons in
high-Q (∼ 300,000), long-lifetime (∼ 300 ps), GaAs/AlGaAs
microcavities.This is a crucial parameter for many-body theories which include
the polariton-polariton interactions.It is much harder to establish this number
in high-Q structures compared to low-Q structures, because the upper
polariton is nearly invisible in high-Q cavities.We present a combination of
photoluminescence, photoluminescence excitation, and reflectivity measurements
to highly constrain the fit model, and compare the results of this model to the
results from low-Q structures.We present a fitted curve of exciton fraction
as a function of the lower polariton energy for multiple samples which have
been used in prior experiments.
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