Abstract

The idea of utilizing the second-order plasmon resonance of gold nanorod π-dimers for plasmon rulers is introduced. We report on a qualitatively different dependence of the plasmon resonance shift on the interparticle distance for the first- and second-order longitudinal modes of the nanorods, extending the working range of plasmon rulers up to the distance values of approximately 400 nm.

© 2015 Optical Society of America

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