Experimental evidence for large dynamic effects on the plasmon dispersion of subwavelength metal nanoparticle waveguides

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Koenderink, A. Femius and Waele, Rene de and Prangsma, Jord Cornelis and Polman, Albert (2007) Experimental evidence for large dynamic effects on the plasmon dispersion of subwavelength metal nanoparticle waveguides. Physical Review B: Condensed matter and materials physics, 76 (20). p. 201403. ISSN 1098-0121

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Abstract:We present angle- and frequency-resolved optical extinction measurements to determine the dispersion relation of plasmon modes on Ag and Au nanoparticle chains with pitches down to 75 nm. The large splitting between transverse and longitudinal modes and the band curvature are inconsistent with reported electrostatic near-field models and confirm that far-field retarded interactions are important, even for λ∕5-sized structures. The data imply that lower propagation losses, larger signal bandwidth, and larger maximum group velocity than expected can be achieved for wave vectors below the light line. We conclude that for the design of optical nanocircuits coherent far-field couplings across the entire circuit need to be considered, even at subwavelength feature sizes
Item Type:Article
Copyright:© 2007 The American Physical Society
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Link to this item:http://purl.utwente.nl/publications/74721
Official URL:http://dx.doi.org/10.1103/PhysRevB.76.201403
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