Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array

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Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array

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dc.contributor.author Murray, W. Andrew en_GB
dc.contributor.author Astilean, Simion en_GB
dc.contributor.author Barnes, William L. en_GB
dc.contributor.department University of Exeter; Babes-Bolyai University, Romania en_GB
dc.date.accessioned 2008-08-26T15:39:44Z en_GB
dc.date.accessioned 2011-01-25T11:55:13Z en_US
dc.date.accessioned 2013-03-20T13:01:35Z
dc.date.issued 2004 en_GB
dc.description.abstract We present results of experiments to determine the dispersion of the plasmon modes associated with periodic silver nanoparticle and nanohole arrays fabricated using an extension of the nanosphere lithography technique. Ordered monolayers of polystyrene nanospheres were used as a deposition mask through which silver was deposited by thermal evaporation, subsequent removal of the nanospheres thus leaving an array of metallic nanoparticles. By reactive-ion etching of the nanospheres in an oxygen plasma prior to silver deposition, arrays consisting of particles of increasing size were fabricated. The extremities of the particles eventually merge to create a continuous metallic network perforated by subwavelength holes, thus allowing a study of the particle-hole transition. Combining optical measurements of transmittance and reflectance with information gained using scanning electron microscopy, three separate regimes were observed. For low etch times the samples comprise mainly individual nanoparticles and the optical response is dominated by localized surface plasmon resonances that show no dispersion. As the etch time is increased almost all of the nanoparticles merge with adjacent particles, although many defects are present—notably where some particles fail to merge, a small gap being left between them. The presence of these defects prevents an abrupt structural transition from metallic nanoparticles to a continuous metallic film perforated by an array of nanoholes. The presence of such gaps also results in dispersion data that lack clearly defined features. A further increase in etch time leads to samples with no gaps: instead, a continuous metal film perforated by a nanohole array is produced. The optical response of these structures is dominated by extended surface plasmon-polariton modes. en_GB
dc.identifier.citation 69 (16), article 165407 en_GB
dc.identifier.doi 10.1103/PhysRevB.69.165407 en_GB
dc.identifier.uri http://hdl.handle.net/10036/36454 en_GB
dc.language.iso en en_GB
dc.publisher American Physical Society en_GB
dc.relation.url http://dx.doi.org/10.1103/PhysRevB.69.165407 en_GB
dc.relation.url http://link.aps.org/abstract/PRB/v69/e165407 en_GB
dc.title Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array en_GB
dc.type Article en_GB
dc.date.available 2008-08-26T15:39:44Z en_GB
dc.date.available 2011-01-25T11:55:13Z en_US
dc.date.available 2013-03-20T13:01:35Z
dc.identifier.issn 1098-0121 en_GB
dc.identifier.issn 1550-235X en_GB
dc.description W. Andrew Murray, Simion Astilean, and William L. Barnes, Physical Review B, Vol. 69, article 165407 (2004). "Copyright © 2004 by the American Physical Society." en_GB
dc.identifier.journal Physical Review B en_GB


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