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PIERS Online
Vol. 3
No. 8
2007
pp: 1170-1174Field Propagation in Nanoporous Metal WaveguidesAri J. Viitanen, I. S. Nefedov, and Sergei A. Tretyakov doi:10.2529/PIERS070218051450 Downloads: 1149 Abstract:In this paper propagation of electromagnetic ¯elds in a structure with regular arrays of pores in metal is considered. This structuce is analyzed in a similar way as the arrays of dipoles. Now in this case, the surrounding medium is metal while the inclusions are empty spheres. The inclusions resonate at the certain frequency making the interaction between the inclusions very strong. The linear chain of such resonating particles forms a waveguide. Although the ¯eld is decaying outside the pores, these inclusions are so close to each other that there is interaction with the neighbouring pores. Near the resonance this interaction is strong enough that there exist guided wave modes along the array. Properties of these modes are investigated. The allowed frequency range where the guided modes exist depend on the geometry, i.e., how close the pores are and what is the size of pores. There exist two propagating modes, transversal and axial polarizations. The transversally polarized field propagates as a forward wave and the axially polarized field as a backward wave.References:1. Coyle, S., M. C. Netti, J. J. Baumberg, M. A. Ghanem, P. R. Birkin, P. N. Bartlett, and D. M. Whittaker "Confined plasmons in metallic nanocavities," Phys. Rev. Lett., Vol. 87, No. 17, 176801(1--4), 2001. 2. Velev, O. D., P. M. Tessier, A. M. Lenhoff, and E. W. Kaler "A class of porous metallic nanostructures," Nature, Vol. 401, 548, 1999. 3. Wijnhoven, J. E. G. J., S. J. M. Zevenhuizen, M. A. Hendriks, D. Vanmaekelbergh, J. J. Kelly, and W. L. Vos "Electrochemical assembly of ordered macropores in gold," Advanced Materials, Vol. 12, No. 12, 888-890, 2000. 4. Stefanou, N., A. Modinos, and V. Yannopapas "Optical transparency of mesoporous metals," Solid State Commun., Vol. 118, No. 2, 69-73, 2001. 5. Teperik, T. V., V. V. Popov, and F. J. Garcia de Abajo "Void plasmons and total absorption of light in nanoporous metallic films," Physical Review B, Vol. 71, 085408(1--9), 2005. 6. Tretyakov, S. A. and A. J. Viitanen, "Line of periodically arranged passive dipole scatterers," Electrical Engineering, Archiv fur Elektrotechnik, Vol. 82, No. 6, 353-361, 2000. 7. Viitanen, A. J. and S. A. Tretyakov, "Metawaveguides formed by arrays of small resonant particles over a ground plane," Journal of Optics A: Pure and Applied Optics, Vol. 7, No. 2, S133-S140, 2005. 8. Weber, W. H. and G. M. Ford, "Propagation of optical excitations by dipolar interactions in metal nanoparticle chains," Physical Review B, Vol. 70, No. 125429(1--8), 2004. 9. Simovski, C. R., A. J. Viitanen, and S. A. Tretyakov "Resonator mode in chains of silver spheres and its possible application," Physical Review E, Vol. 72, 066606(1--10), 2005. |
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