title: Transient photothermal spectra of plasmonic nanobubbles.
abstract: The photothermal efficacy of near-infrared gold nanoparticles (NP), nanoshells, and nanorods was studied under pulsed high-energy optical excitation in plasmonic nanobubble (PNB) mode as a function of the wavelength and duration of the excitation laser pulse. PNBs, transient vapor nanobubbles, were generated around individual and clustered overheated NPs in water and living cells. Transient PNBs showed two photothermal features not previously observed for NPs: the narrowing of the spectral peaks to 1 nm and the strong dependence of the photothermal efficacy upon the duration of the laser pulse. Narrow red-shifted (relative to those of NPs) near-infrared spectral peaks were observed for 70 ps excitation laser pulses, while longer sub- and nanosecond pulses completely suppressed near-infrared peaks and blue shifted the PNB generation to the visual range. Thus, PNBs can provide superior spectral selectivity over gold NPs under specific optical excitation conditions.
authors.affiliation: Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005, United States.
authors.forename: Ekaterina Y
authors.initials: EY
authors.lastname: Lukianova-Hleb
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Sassaroli
authors.forename: Alicia
authors.initials: A
authors.lastname: Jones
authors.forename: Dmitri O
authors.initials: DO
authors.lastname: Lapotko
mesh_terms: D045744:Cell Line, Tumor; D016503:Drug Delivery Systems; D006046:Gold / Q000737:chemistry; D006801:Humans; D007834:Lasers; D053768:Metal Nanoparticles / Q000008:administration & dosage / Q000737:chemistry*; D057145:Nanoshells / Q000737:chemistry; D043942:Nanotubes / Q000737:chemistry; D055668:Photochemical Processes; D012542:Scattering, Radiation; D019265:Spectroscopy, Near-Infrared; D020349:Surface Plasmon Resonance
chemical_list: D006046:Gold