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Observation of Plasmon Hybridization in Gold Nanoparticle Pairs
송정훈,Arto V. Nurmikko,이기원,Sa-Yong Hong,Tolga Atay,Yong-Gi Kim,Young-You Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
The hybridization of an individual plasmon in gold nanoparticle dimers was observed. By varying the interparticle separation within the metallic nanoparticle on a nanometer scale, we observed a renormalization, as well as a splitting, of the surface plasmon energy. The distinct hybridization and splitting of the individual plasmon mode were detectable in dimer plasmons when the edge-to-edge separation was smaller than $\sim$13 nm in gold particle pairs with a diameter of 160 nm, and a height of 40 nm for each particle. The range of the interparticle separation where the hybridization was detectable was sensitive to each particle's aspect ratio and size. An initial study of the ultrafast nonlinear optical response of exciton-plasmon coupled system is also reported. We observed an enhancement of the transient nonlinear transmission of Frenkel excitons in an organic semiconductor, cyanine J-aggregate, resonantly coupled with surface plasmons in gold metallic particle arrays.