Europhys. Lett.
Volume 66, Number 6, June 2004
Page(s) 785 - 791
Section General
Published online 01 June 2004
Europhys. Lett., 66 (6) , pp. 785-791 (2004)
DOI: 10.1209/epl/i2003-10268-x

Frustrated energy transport through micro-waveguides decorated by gold nanoparticle chains

R. Quidant1, 2, G. Lévêque3, J.-C. Weeber2, A. Dereux2, C. Girard4 and J. Weiner3

1  ICFO, Institut de Ciències Fotòniques - Jordi Girona 29, Nexus II 08034 Barcelona, Spain
2  LPUB, UMR-CNRS 5027 - 9 avenue A. Savary, F-21078 Dijon, France
3  LCAR, UMR-CNRS 5589, Université Paul Sabatier - 31062 Toulouse, France
4  CEMES, UPR-CNRS 8011 - 29 Rue Jeanne Marvig, BP4347 F-31055 Toulouse, France

(Received 5 December 2003; accepted in final form 20 April 2004)

This letter reports near-field optical observations of light energy transport along micro-waveguides decorated by short chains of gold "nanodots". In spite of their subwavelength dimensions (100 $\un{nm}$ diameter $\times 20$ $\un{nm}$ height), the metallic dots in the chain function as an efficient photonic band filter or a nanometric Bragg mirror. Numerical simulations reproduce the observed phenomenon and indicate that the occurrence of a band gap for light transport through the decorated guide corresponds to a selective absorption by the metallic chain.

07.79.Fc - Near-field scanning optical microscopes.
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
78.66.Bz - Metals and metallic alloys.

© EDP Sciences 2004