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Noble-metal nanoparticles show large optical resonances caused by collective electron excitations known as surface plasmons (SP's). Elliptic particles with axis dimensions a=b<c show an extreme optical anisotropy, exhibiting two different SP's which lie at considerably different energies and are polarized perpendicularly with respect to each other (Fig. 1 upper part). In the present contribution, we show for the first time that these different collective excitations influence each other via hot-electron processes.
© 1998 IEEE
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