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Cavity Quantum Electrodynamics with Carbon Nanotubes

Abstract : Carbon nanotubes are extensively investigated for their amazing mechanical and electronic properties. Optically, they are excellent candidates for on-demand single-photon sources because they can be electrically excited and they can emit anti-bunched light at room temperature in the telecoms bands. However, their emission efficiency is low, its origins remain unclear and the spectral shape of their photoluminescence is complicated. Abstract In this work, we build an original setup combining a confocal microscope and a fiber based micro-cavity which is both spatially and spectrally tunable. With this device, we observed the rise of cavity quantum electrodynamics effects by analyzing the evolution of the dipole-cavity coupling as a function of the cavity volume. We obtained a strong acceleration of the spontaneous emission rate, due to Purcell factors above 100. The associated effective efficiency of the source reaches up to 50%, leading to a brightness of up to 10%, while keeping excellent anti-bunching features. Abstract We observe the effect of the cavity coupling as a function of the cavity detuning, and develop a model to account for emitters undergoing exciton-phonon coupling in the presence of a cavity. We show that our single-photon source is tunable on a range of frequencies more than a hundred times higher than the cavity spectral width, opening the way to extensive multiplexing. Abstract Further strengthening of the coupling may open the way to the very rich physics of one-dimensional cavity polaritons. And conversely, cavity polaritons could be a tool to understand better the diffusion, and localization properties of excitons in carbon nanotubes. Finally, the original setup build here is extremely versatile and could be used to coupled other types of emitters, such as nano-diamonds or molecules.
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https://hal.archives-ouvertes.fr/tel-01523965
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Submitted on : Wednesday, May 17, 2017 - 12:03:23 PM
Last modification on : Friday, October 15, 2021 - 1:37:37 PM
Long-term archiving on: : Monday, August 21, 2017 - 12:29:05 AM

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  • HAL Id : tel-01523965, version 1

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Adrien Jeantet. Cavity Quantum Electrodynamics with Carbon Nanotubes. Materials Science [cond-mat.mtrl-sci]. Univeristé Denis Diderot Paris 7, 2017. English. ⟨tel-01523965⟩

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