Plasmon resonances of silver and gold nanorods

Nikolai G. Khlebtsov; Lyubov A. Trachuk; Andrei G. Melnikov

doi:10.1117/12.568555

14 July 2004 Plasmon resonances of silver and gold nanorods

Nikolai G. Khlebtsov, Lyubov A. Trachuk, Andrei G. Melnikov

Proceedings Volume 5475, Saratov Fall Meeting 2003: Coherent Optics of Ordered and Random Media IV; (2004) https://doi.org/10.1117/12.568555
Event: Saratov Fall Meeting 2003, 2003, Saratov, Russian Federation

Abstract

We studied the extinction and integral scattering spectra of gold and silver nanorods with random or ordered orientations. The calculations were carried out for spheroids, right circular cylinders, circular cylinders with hemispherical ends (T-matrix method), and the rectangular prisms (Discrete Dipole Approximation, DDA). For particles with equivolume diameters greater than 20 nm, we have found a new resonance that is located between the usual plasmon resonances corresponding to the excitation of nanorods by the longitudinal or transversal electric fields. The new resonance can be excited only by TM incident wave, and its magnitude is maximal for orientation of the particle symmetry axis at 54° with respect to the light propagation direction. By contrast to the dominant scattering nature of the longitudinal resonance, the new resonance corresponds to the strong absorption comparable with scattering contribution to the total extinction. It is shown that the new resonance can be attributed to the quadrupole excitation of metal nanorods.

Citation Download Citation

Nikolai G. Khlebtsov, Lyubov A. Trachuk, and Andrei G. Melnikov "Plasmon resonances of silver and gold nanorods", Proc. SPIE 5475, Saratov Fall Meeting 2003: Coherent Optics of Ordered and Random Media IV, (14 July 2004); https://doi.org/10.1117/12.568555

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