Bouhelier A, Bachelot R, Lerondel G, Kostcheev S, Royer P, Wiederrecht G P
Chemistry Division and Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439, USA.
Phys Rev Lett. 2005 Dec 31;95(26):267405. doi: 10.1103/PhysRevLett.95.267405. Epub 2005 Dec 23.
Light emission resulting from two-photon excited gold nanoparticles has been proposed to originate from the radiative decay of surface plasmon resonances. In this vein, we investigated luminescence from individual gold nanorods and found that their emission characteristics closely resemble surface plasmon behavior. In particular, we observed spectral similarities between the scattering spectra of individual nanorods and their photoluminescence emission. We also measured a blueshift of the photoluminescence peak wavelength with decreasing aspect ratio of the nanorods as well as an optically tunable shape-dependent spectrum of the photoluminescence. The emission yield of single nanorods strongly depends on the orientation of the incident polarization consistent with the properties of surface plasmons.
双光子激发金纳米颗粒产生的光发射被认为源于表面等离子体共振的辐射衰减。基于此，我们研究了单个金纳米棒的发光情况，发现它们的发射特性与表面等离子体行为极为相似。特别是，我们观察到单个纳米棒的散射光谱与其光致发光发射之间存在光谱相似性。我们还测量了随着纳米棒纵横比的降低，光致发光峰值波长的蓝移以及光致发光的光学可调形状依赖光谱。单个纳米棒的发射产率强烈依赖于与表面等离子体性质一致的入射偏振方向。
