Frustrated energy transport through micro-waveguides decorated by gold nanoparticle chainsR. 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 diameter 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