Plasmon-modulated photoluminescence of individual gold nanostructures.

In this work, we performed a systematic study on the photoluminescence and scattering spectra of individual gold nanostructures that were lithographically defined. We identify the role of plasmons in photoluminescence as modulating the energy transfer between excited electrons and emitted photons. By comparing photoluminescence spectra with scattering spectra, we observed that the photoluminescence of individual gold nanostructures showed the same dependencies on shape, size, and plasmon coupling as the particle plasmon resonances. Our results provide conclusive evidence that the photoluminescence in gold nanostructures indeed occurs via radiative damping of plasmon resonances driven by excited electrons in the metal itself. Moreover, we provide new insight on the underlying mechanism based on our analysis of a reproducible blue shift of the photoluminescence peak (relative to the scattering peak) and observation of an incomplete depolarization of the photoluminescence.

[1]  L. Liz‐Marzán,et al.  Mapping surface plasmons on a single metallic nanoparticle , 2007 .

[2]  Harald Giessen,et al.  Quantitative modeling of the third harmonic emission spectrum of plasmonic nanoantennas. , 2012, Nano letters.

[3]  Younan Xia,et al.  Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance. , 2008, Journal of materials chemistry.

[4]  Theodore Goodson,et al.  Femtosecond excitation dynamics in gold nanospheres and nanorods , 2005 .

[5]  Feldmann,et al.  Drastic reduction of plasmon damping in gold nanorods. , 2002, Physical review letters.

[6]  A. Mooradian,et al.  Photoluminescence of Metals , 1969 .

[7]  Jean-Yves Bigot,et al.  Electron dynamics in metallic nanoparticles , 2000 .

[8]  Nicholas A. Kotov,et al.  Bioconjugates of CdTe Nanowires and Au Nanoparticles: Plasmon−Exciton Interactions, Luminescence Enhancement, and Collective Effects , 2004 .

[9]  Naomi J. Halas,et al.  Photodetection with Active Optical Antennas , 2011, Science.

[10]  G S Kino,et al.  Improving the mismatch between light and nanoscale objects with gold bowtie nanoantennas. , 2005, Physical review letters.

[11]  Mustafa Yorulmaz,et al.  Luminescence quantum yield of single gold nanorods. , 2012, Nano letters.

[12]  Robert M Dickson,et al.  Highly fluorescent noble-metal quantum dots. , 2007, Annual review of physical chemistry.

[13]  Gyoujin Cho,et al.  Femtosecond Emission Studies on Gold Nanoparticles , 2002 .

[14]  Bernhard Lamprecht,et al.  Optical properties of two interacting gold nanoparticles , 2003 .

[15]  Thomas A. Klar,et al.  Plasmon emission in photoexcited gold nanoparticles , 2004 .

[16]  Stephan Link,et al.  One-Photon Plasmon Luminescence and Its Application to Correlation Spectroscopy as a Probe for Rotational and Translational Dynamics of Gold Nanorods , 2011 .

[17]  Zexiang Shen,et al.  Direct and reliable patterning of plasmonic nanostructures with sub-10-nm gaps. , 2011, ACS nano.

[18]  Evelyn L. Hu,et al.  Large spontaneous emission enhancement in plasmonic nanocavities , 2012, Nature Photonics.

[19]  Joel K. W. Yang,et al.  Mapping of Electron-Beam-Excited Plasmon Modes in Lithographically-Defined Gold Nanostructures , 2011, Microscopy and Microanalysis.

[20]  Coupled nanoantenna plasmon resonance spectra from two-photon laser excitation. , 2010, Nano letters.

[21]  David R. Smith,et al.  Shape effects in plasmon resonance of individual colloidal silver nanoparticles , 2002 .

[22]  Stephan Link,et al.  Plasmon emission quantum yield of single gold nanorods as a function of aspect ratio. , 2012, ACS nano.

[23]  George C. Schatz,et al.  The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment , 2003 .

[24]  M. Frimmer,et al.  Signature of a Fano resonance in a plasmonic metamolecule's local density of optical states. , 2011, Physical review letters.

[25]  Lukas Novotny,et al.  Continuum generation from single gold nanostructures through near-field mediated intraband transitions , 2003 .

[26]  Gregory V Hartland,et al.  Optical studies of dynamics in noble metal nanostructures. , 2011, Chemical reviews.

[27]  P. Nordlander,et al.  Plasmons in strongly coupled metallic nanostructures. , 2011, Chemical reviews.

[28]  Younan Xia,et al.  Shape-Controlled Synthesis and Surface Plasmonic Properties of Metallic Nanostructures , 2005 .

[29]  Shen,et al.  Photoinduced luminescence from the noble metals and its enhancement on roughened surfaces. , 1986, Physical review. B, Condensed matter.

[30]  Jonathan A. Fan,et al.  Influence of excitation and collection geometry on the dark field spectra of individual plasmonic nanostructures. , 2010, Optics express.

[31]  G. Schatz,et al.  Electromagnetic fields around silver nanoparticles and dimers. , 2004, The Journal of chemical physics.

[32]  Michel Bosman,et al.  Nanoplasmonics: classical down to the nanometer scale. , 2012, Nano letters.

[33]  J. Güdde,et al.  Electron and lattice dynamics following optical excitation of metals , 2000 .

[34]  Daniel Moses,et al.  Plasmonic photosensitization of a wide band gap semiconductor: converting plasmons to charge carriers. , 2011, Nano letters.

[35]  M. El-Sayed,et al.  The `lightning' gold nanorods: fluorescence enhancement of over a million compared to the gold metal , 2000 .

[36]  Javier Aizpurua,et al.  Close encounters between two nanoshells. , 2008, Nano letters.

[37]  Ulrich Hohenester,et al.  High-resolution surface plasmon imaging of gold nanoparticles by energy-filtered transmission electron microscopy , 2009 .