Evidence for a Polariton-Mediated Biexciton Transition in Single-Walled Carbon Nanotubes

Strong coupling of excitonic resonances with a cavity gives rise to exciton–polaritons which possess a modified energy landscape compared to the uncoupled emitter. However, due to the femtosecond lifetime of the so-called bright polariton states and transient changes of the cavity reflectivity under...

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Veröffentlicht in:ACS photonics 2022-05, Vol.9 (5), p.1567-1576
Hauptverfasser: Lüttgens, Jan M., Kuang, Zhuoran, Zorn, Nicolas F., Buckup, Tiago, Zaumseil, Jana
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container_issue 5
container_start_page 1567
container_title ACS photonics
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creator Lüttgens, Jan M.
Kuang, Zhuoran
Zorn, Nicolas F.
Buckup, Tiago
Zaumseil, Jana
description Strong coupling of excitonic resonances with a cavity gives rise to exciton–polaritons which possess a modified energy landscape compared to the uncoupled emitter. However, due to the femtosecond lifetime of the so-called bright polariton states and transient changes of the cavity reflectivity under excitation, it is challenging to directly measure the polariton excited state dynamics. Here, near-infrared pump–probe spectroscopy is used to investigate the ultrafast dynamics of exciton–polaritons based on strongly coupled (6,5) single-walled carbon nanotubes in metal-clad microcavities. We present a protocol for fitting the reflectivity-associated response of the cavity using genetic algorithm-assisted transfer-matrix simulations. With this approach, we are able to identify an absorptive exciton–polariton feature in the transient transmission data. This feature appears instantaneously under resonant excitation of the upper polariton but is delayed for off-resonant excitation. The observed transition energy and detuning dependence point toward a direct upper polariton-to-biexciton transition. Our results provide direct evidence for exciton–polariton intrinsic transitions beyond the bright polariton lifetime in strongly coupled microcavities.
doi_str_mv 10.1021/acsphotonics.1c01590
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title Evidence for a Polariton-Mediated Biexciton Transition in Single-Walled Carbon Nanotubes
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