Brolo Alexandre G, Kwok Shing C, Cooper Matthew D, Moffitt Matthew G, Wang C-W, Gordon Reuven, Riordon Jason, Kavanagh Karen L
Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, B.C., Canada.
J Phys Chem B. 2006 Apr 27;110(16):8307-13. doi: 10.1021/jp054129c.
The coupling of semiconductor quantum dots (QDs) to the surface plasmon (SP) modes of nanohole arrays in a metal film was demonstrated for the first time, showing enhancement in the spontaneous emission by 2 orders of magnitude. The SP-enhanced transmission resonances of the nanohole arrays were tuned around the photoluminescence (PL) peak of polystyrene-b-poly(acrylic acid) (PS-b-PAA)-stabilized cadmium sulfide (CdS) quantum dots (QDs) in contact with the arrays. As a result the overall PL from the SP-QD system was enhanced by 2 orders of magnitude, even after excluding the enhanced transmission of the nanohole array without the QDs. The maximum enhancement occurred when the resonance from the nanohole array matched the QD PL spectrum. Time-resolved PL measurements were used to estimate the relative contribution of different physical mechanisms to the enhanced spontaneous emission. The increased spontaneous emission in the SP-QD system is promising for prospective plasmonic light-emitting devices incorporating QDs.
首次证明了半导体量子点（QD）与金属膜中纳米孔阵列的表面等离子体（SP）模式的耦合，自发发射增强了2个数量级。纳米孔阵列的SP增强传输共振在与阵列接触的聚苯乙烯-b-聚（丙烯酸）（PS-b-PAA）稳定的硫化镉（CdS）量子点（QD）的光致发光（PL）峰附近进行了调谐。结果，即使排除了没有QD的纳米孔阵列的增强传输，SP-QD系统的整体PL也增强了2个数量级。当纳米孔阵列的共振与QD PL光谱匹配时，增强效果最大。时间分辨PL测量用于估计不同物理机制对增强自发发射的相对贡献。SP-QD系统中自发发射的增加对于包含QD的前瞻性等离子体发光器件很有前景。
