Coherence and Interaction in Confined Room-Temperature
Polariton Condensates with Frenkel Excitons
Simon Betzold
Marco Dusel
Oleksandr Kyriienko
Christof P. Dietrich
Sebastian Klembt
Jürgen Ohmer
Utz Fischer
Ivan A. Shelykh
Christian Schneider
Sven Höfling
10.1021/acsphotonics.9b01300.s001
https://acs.figshare.com/articles/journal_contribution/Coherence_and_Interaction_in_Confined_Room-Temperature_Polariton_Condensates_with_Frenkel_Excitons/11562099
Strong
light–matter coupling of a photon mode to tightly
bound Frenkel excitons in organic materials has emerged as a versatile,
room-temperature platform to study nonlinear many-particle physics
and bosonic condensation. However, various aspects of the optical
response of Frenkel excitons in this regime remained largely unexplored.
Here, a hemispheric optical cavity filled with the fluorescent protein
mCherry is utilized to address two important questions. First, combining
the high quality factor of the microcavity with a well-defined mode
structure allows to address whether temporal coherence in such systems
can be competitive with their low-temperature counterparts. To this
end, a coherence time greater than 150 ps is evidenced via interferometry,
which exceeds the polariton lifetime by 2 orders of magnitude. Second,
the narrow line width of the device allows to reliably trace the emission
energy of the condensate with increasing particle density and thus
to establish a fundamental picture that quantitatively explains the
core nonlinear processes. It is found that the blue-shift of the Frenkel
exciton–polaritons is largely dominated by the reduction of
the Rabi splitting due to phase space filling effects, which is influenced
by the redistribution of polaritons in the system. The highly coherent
emission at ambient conditions establishes organic materials as a
promising active medium in room-temperature polariton lasers, and
the detailed insights on the nonlinearity are of great benefit toward
implementing nonlinear polaritonic devices, optical switches, and
lattices based on exciton–polaritons at room temperature.
2020-01-09 21:15:51
material
mode
Frenkel excitons
core nonlinear processes
Confined Room-Temperature Polariton Condensates
coherence
emission
room-temperature polariton lasers
study nonlinear many-particle physics
nonlinear polaritonic devices