Observation of plasmon line broadening in single gold nanorods

Attempts to realize the important potential of gold nanorods as extremely bright molecular markers have been limited by the broad spectroscopic linewidths usually observed. We identify the origin of this broadening as inhomogeneous broadening due to the extreme sensitivity of the surface plasmon resonance to the nanorod aspect ratio. Using confocal light scattering spectroscopic microscopy, we observed the narrow homogeneously broadened plasmon lines of single gold nanorods and obtained the first quantitative measurements of this homogeneous broadening. We show that homogeneous broadening can be predicted from first principals.

[1]  A. Mikhailovsky,et al.  Broadband near-field interference spectroscopy of metal nanoparticles using a femtosecond white-light continuum. , 2003, Optics letters.

[2]  V. Sandoghdar,et al.  Detection and spectroscopy of gold nanoparticles using supercontinuum white light confocal microscopy. , 2004, Physical review letters.

[3]  Michael B. Wallace,et al.  Observation of periodic fine structure in reflectance from biological tissue: A new technique for measuring nuclear size distribution , 1998 .

[4]  M. El-Sayed,et al.  Shape and size dependence of radiative, non-radiative and photothermal properties of gold nanocrystals , 2000 .

[5]  R. Gans,et al.  Über die Form ultramikroskopischer Goldteilchen , 1912 .

[6]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[7]  Irving Itzkan,et al.  Confocal light absorption and scattering spectroscopic microscopy monitors organelles in live cells with no exogenous labels , 2007, Proceedings of the National Academy of Sciences.

[8]  Bo N. J. Persson,et al.  Polarizability of small spherical metal particles : influence of the matrix environment , 1993 .

[9]  Thomas A. Klar,et al.  Surface-Plasmon Resonances in Single Metallic Nanoparticles , 1998 .

[10]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[11]  S. Shapshay,et al.  Detection of preinvasive cancer cells , 2000, Nature.

[12]  Paul Mulvaney,et al.  Drastic reduction of plasmon damping in gold nanorods. , 2002 .

[13]  P. Debye,et al.  Der Lichtdruck auf Kugeln von beliebigem Material , 2014 .

[14]  Michael Vollmer,et al.  Optical properties of metal clusters , 1995 .

[15]  Paul Mulvaney,et al.  Gold nanorod extinction spectra , 2006 .

[16]  Michael S. Feld,et al.  Imaging human epithelial properties with polarized light-scattering spectroscopy , 2001, Nature Medicine.

[17]  P. Waterman.  Matrix formulation of electromagnetic scattering , 1965 .

[18]  M. Mishchenko,et al.  Reprint of: T-matrix computations of light scattering by nonspherical particles: a review , 1996 .

[19]  Catherine J. Murphy,et al.  Wet Chemical Synthesis of High Aspect Ratio Cylindrical Gold Nanorods , 2001 .

[20]  Vahid Sandoghdar,et al.  Measurement of the complex dielectric constant of a single gold nanoparticle. , 2006, Optics letters.