AMO Seminar - Lene Oddershede: 'Optical heating and manipulation of a single nanoparticle'
Oplysninger om arrangementet
A precise control over individual nanoparticles has huge potential for nano-architectural purposes and for probing nano-scale interactions.
However, the absorption and heating associated with resonant irradiation of an individual gold nanoparticle can be extreme. Moreover, the heating of a nanoparticle cannot be theoretically predicted as the precise focal intensity distribution on the nanoscale is unknown and typically highly aberrated . Utilizing a novel assay based on partitioning of lipophilic dyes between membrane phases we quantify the heating of an individual irradiated gold nanoparticle [2,3]. The heating of the particle is dependent on laser power, and for a nanorod, also on its orientation with respect to the laser polarization . A dramatic and irreversible change in plasmonic behavior of a nanorod occurs at high illumination intensities as the nanorod restructures into a more spherical shape. Nanoparticles can be used inside living cells for precise force measurements , and the photo-thermal effect of metallic nanoparticles can be used to create localized heat gradients inside living cells thus investigating cellular responses to heat chocks.
 A. Kyrsting, P.M. Bendix, L.B. Oddershede, Mapping 3D focal intensity exposes the stable trapping positions of single nanoparticles, Nano Letters vol.13 p.31-35 (2013).
 A. Kyrsting, P.M. Bendix, D.G. Stamou, and L.B. Oddershede. Heat Profiling of Three-Dimensionally Optically Trapped Gold Nanoparticles using Vesicle Cargo Release. Nano Letters, vol 11 p.888-892 (2011).
 P.M. Bendix, S.N.S. Reihani and L.B. Oddershede. Direct measurements of heating by electromagnetically trapped gold nanoparticles on supported lipid bilayers. ACS Nano, vol. 4 p.2256-2262 (2010)
 H. Ma, P.M. Bendix, L.B. Oddershede. Large-Scale Orientation Dependent Heating from a Single Irradiated Gold Nanorod. Nano Letters vol.12 p.3954-3960 (2012)
 L.B. Oddershede. Force probing of individual molecules inside the living cell is now a reality. Nature Chemical Biology vol.8 p.879-886 (2012).
Coffee/tea and cake will be served from 15:05