title: Photothermal reshaping of gold nanoparticles in a plasmonic absorber.
abstract: We experimentally demonstrate that a metamaterial nanostructure can have a localized heating response owing to plasmonic resonances in the near-infrared wavelength range (from 1.5 to 2 µm). With a broadband nanosecond-pulse light, the temperature of composing gold particles in the nanostructure can be easily increased to over 900K within only several nanoseconds, resulting in re-shaping of the particles. The photothermal effect is elaborated with finite-element based numerical simulations. The absorption resonance can in principle be tailored with a great freedom by choosing appropriate metamaterial parameters. The light-induced heating in an artificial metamaterial can be potentially used for all-optical acute temperature tuning in a micro-environment, which may open new frontiers especially in nanotechnology and biotechnology.
authors.affiliation: Division of Optics and Photonics, Royal Institute of Technology, KTH, Electrum 229, 164 40 Kista, Sweden.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Yiting
authors.initials: Y
authors.lastname: Chen
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Jiaming
authors.initials: J
authors.lastname: Hao
authors.forename: Min
authors.initials: M
authors.lastname: Yan
authors.forename: Min
authors.initials: M
authors.lastname: Qiu
mesh_terms: D006046:Gold / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D018625:Microscopy, Atomic Force; D010777:Photochemistry / Q000379:methods*; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D006046:Gold