We report on the first realization of hyperspectral imaging for visualization and excitation of plasmon modes in dimers of 100 nm gold decahedra by a scanning electron beam

Bashevoy, Maxim

García de Abajo, F.Javier

Jonsson, Fredrik

Liz-Marzán, Luis M.

Pastoriza-Santos, Isabel

Zheludev, Nikolay I.

English

Southampton (e-Prints Soton)

Electron Beam Excitation of Plasmonic                 Modes in Gold Dimers Maxim Bashevoy, Fredrik Jonsson and Nikolay I. Zheludev Optoelectronics Research Centre, University of Southampton, SO17 1BJ, UK F. Javier García de Abajo Instituto de Óptica, CSIC, Serrano 121, 28006 Madrid, Spain Isabel Pastoriza-Santos and Luis M. Liz Marzán Departamento de Química Física, Universidade de Vigo, 36310 Vigo, Spain Abstract: We report on the first realization of hyperspectral imaging for visualization and excitation of plasmon modes in dimers of 100 nm gold decahedra by a scanning electron beam. Electron Beam Excitation of Plasmonic                 Modes in Gold Dimers Maxim Bashevoy, Fredrik Jonsson and Nikolay I. Zheludev Optoelectronics Research Centre, University of Southampton, SO17 1BJ, UK F. Javier García de Abajo Instituto de Óptica, CSIC, Serrano 121, 28006 Madrid, Spain Isabel Pastoriza-Santos and Luis M. Liz Marzán Departamento de Química Física, Universidade de Vigo, 36310 Vigo, Spain We report on the first realization of a hyperspectral imaging (HSI) technique of surface plasmon polaritons excited in metallic nanostructures by a scanning electron beam. The HSI image is formed by scanning a plasmonic structure with a focused electron beam, simultaneously recording the spectra of light emission from decoupled plasmons by a spectrum  analyzer,  resulting  in  a  hyperspectral  data  cube  consisting  of  the  spatial coordinates of electron beam and the corresponding plasmon emission spectra.  Fig. 1. Electron beam excitation of plasmons in the dimer (a), consisting of two 100 nm gold decahedra separated by 20 nm. Asymmetric (b) and symmetric (c) modes are found at 550 and 650 nm, respectively.  Fig. 2. Intensity distribution along the axis of the dimer (a), illustrating the hybridization mode at 620 nm, at which the nanoparticles collectively act as a dipole, and the separated mode at 1120 nm, in which they act as separate entities (b). We  performed  plasmonic  HSI  on  a  dimer [1]  consisting  of  two  gold  100  nm decahedra  on  a  carbon  substrate  (Fig. 1).  The  plasmonic  modes  of  the  dimer  were visualized, and we identify the electron beam excitation of symmetric, asymmetric and hybridization modes (Fig. 2). The demonstrated technique can be used in single-scan examination  of  plasmonic  nanostructures  with  the  resolution  of  a  scanning  electron microscope. It has all advantages of plasmon generation by free electron injection [2], such as fast repositioning and a high localization and intensity of the plasmon source. References [1]  I. Romero, J. Aizpurua, G. W. Bryant, F. J. García de Abajo, Optics Express 14, 9988 (2006). [2]  M. V. Bashevoy et al., Nano Letters 6, 1113 (2006); J. T. van Wijngaarden et al., Appl. Phys. Lett. 88, 221111 (2006). 

Electron beam excitation of plasmonic modes in gold dimers

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