title: Cavity-free plasmonic nanolasing enabled by dispersionless stopped light.
abstract: When light is brought to a standstill, its interaction with gain media increases dramatically due to a singularity in the density of optical states. Concurrently, stopped light engenders an inherent and cavity-free feedback mechanism, similar in effect to the feedback that has been demonstrated and exploited in large-scale disordered media and random lasers. Here we study the spatial, temporal and spectral signatures of lasing in planar gain-enhanced nanoplasmonic structures at near-infrared frequencies and show that the stopped-light feedback mechanism allows for nanolasing without a cavity. We reveal that in the absence of cavity-induced feedback, the subwavelength lasing mode forms dynamically as a phase-locked superposition of quasi dispersion-free waveguide modes. This mechanism proves remarkably robust against interface roughness and offers a new route towards nanolasing, the experimental realization of ultra-thin surface emitting lasers, and cavity-free active quantum plasmonics.
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.
authors.forename: Tim
authors.initials: T
authors.lastname: Pickering
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.
authors.forename: Joachim M
authors.initials: JM
authors.lastname: Hamm
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.
authors.forename: A Freddie
authors.initials: AF
authors.lastname: Page
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wuestner
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.
authors.forename: Ortwin
authors.initials: O
authors.lastname: Hess