Article abstract
Nature Nanotechnology 2, 435 - 440 (2006)
Published online: 1 July 2007 | doi:10.1038/nnano.2007.189
Subject Categories: Molecular self-assembly | Photonic structures and devices | Surface patterning and imaging
Tunable plasmonic lattices of silver nanocrystals
Andrea Tao1,2, Prasert Sinsermsuksakul1 & Peidong Yang1,2
Abstract
Silver nanocrystals are ideal building blocks for plasmonic materials that exhibit a wide range of unique and potentially useful optical phenomena. Individual nanocrystals display distinct optical scattering spectra and can be assembled into hierarchical structures that couple strongly to external electromagnetic fields. This coupling, which is mediated by surface plasmons, depends on the shape and arrangement of the nanocrystals. Here we demonstrate the bottom-up assembly of polyhedral silver nanocrystals into macroscopic two-dimensional superlattices using the Langmuir–Blodgett technique. Our ability to control interparticle spacing, density and packing symmetry allows for tunability of the optical response over the entire visible range. This assembly strategy offers a new, practical approach to making novel plasmonic materials for application in spectroscopic sensors, subwavelength optics and integrated devices that utilize field-enhancement effects.
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
Correspondence to: Peidong Yang1,2 e-mail: p_yang@berkeley.edu
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