title: Ultrafast dynamics of nanoplasmonic stopped-light lasing.
abstract: We study the spatio-temporal dynamics of coherent amplification and lasing in planar gain-enhanced nanoplasmonic structures and show that a singularity in the density of optical states leads to a stopped-light feedback mechanism that allows for cavity-free photonic and surface-plasmon polariton nanolasing. We reveal that in the absence of cavity-induced feedback a phase-locked superposition of a quasi dispersion-free waveguide mode promotes the dynamic formation of a subwavelength lasing mode. Simulations on the basis of a full-time domain Maxwell-Bloch Langevin approach uncover a high spontaneous emission factor β≈0.9 and demonstrate that the stopped-light lasing/spasing mechanism is remarkably robust against interface roughness. Stopped-light surface-plasmon polariton lasing is shown to be stable for gain sections of a width of down to 200 nm but in wider gain structures of the order of 1 μm the dynamics is characterised by spatio-temporally oscillating lasing surface-plasmon polaritons with typical temporal and spatial periods of smaller than 5 fs and smaller than 100 nm. Stopped-light lasing thus provides opportunities for ultrafast nanolasing and the realization of ultra-thin lasing surfaces and offers a new route to ultrafast spasing and cavity-free active quantum plasmonics.
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK. o.hess@imperial.ac.uk.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wuestner
authors.forename: Tim
authors.initials: T
authors.lastname: Pickering
authors.forename: Joachim M
authors.initials: JM
authors.lastname: Hamm
authors.forename: A Freddie
authors.initials: AF
authors.lastname: Page
authors.forename: Andreas
authors.initials: A
authors.lastname: Pusch
authors.forename: Ortwin
authors.initials: O
authors.lastname: Hess