title: Real-time tunable lasing from plasmonic nanocavity arrays.
abstract: Plasmon lasers can support ultrasmall mode confinement and ultrafast dynamics with device feature sizes below the diffraction limit. However, most plasmon-based nanolasers rely on solid gain materials (inorganic semiconducting nanowire or organic dye in a solid matrix) that preclude the possibility of dynamic tuning. Here we report an approach to achieve real-time, tunable lattice plasmon lasing based on arrays of gold nanoparticles and liquid gain materials. Optically pumped arrays of gold nanoparticles surrounded by liquid dye molecules exhibit lasing emission that can be tuned as a function of the dielectric environment. Wavelength-dependent time-resolved experiments show distinct lifetime characteristics below and above the lasing threshold. By integrating gold nanoparticle arrays within microfluidic channels and flowing in liquid gain materials with different refractive indices, we achieve dynamic tuning of the plasmon lasing wavelength. Tunable lattice plasmon lasers offer prospects to enhance and detect weak physical and chemical processes on the nanoscale in real time.
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Ankun
authors.initials: A
authors.lastname: Yang
authors.affiliation: Department of Physics, Duke University, Durham, North Carolina 27708, USA.
authors.forename: Thang B
authors.initials: TB
authors.lastname: Hoang
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Montacer
authors.initials: M
authors.lastname: Dridi
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Claire
authors.initials: C
authors.lastname: Deeb
authors.affiliation: Department of Physics, Duke University, Durham, North Carolina 27708, USA.|Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
authors.forename: Maiken H
authors.initials: MH
authors.lastname: Mikkelsen
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: George C
authors.identifier: http://orcid.org/0000-0001-5837-4740
authors.initials: GC
authors.lastname: Schatz
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.|Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Teri W
authors.identifier: http://orcid.org/0000-0002-8490-292X
authors.initials: TW
authors.lastname: Odom