Hybrid optical materials of plasmon-coupled CdSe/ZnS coreshells for photonic applications.
Hybrid optical materials of plasmon-coupled CdSe/ZnS coreshells for photonic applications.
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DOI：
10.1364/ome.2.001026
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发表时间：
2012-08-01
影响因子：
2.8
通讯作者：
Yu W
中科院分区：
文献类型：
--
作者：
Seo J;Fudala R;Kim WJ;Rich R;Tabibi B;Cho H;Gryczynski Z;Gryczynski I;Yu W
为光子应用开发了等离子体耦合 SQD 的混合光学纳米结构。通过 PMMA 等离子体蚀刻控制表面浓度为 ~9.18 × 10−4 nm−2 的单层 Au 纳米粒子和表面浓度为 ~3.7 × 10−3 nm−2 的 CdSe/ZnS SQD 之间的耦合距离。等离激元耦合 SQD 的时间分辨光谱显示，最长寿命大幅缩短，PL 增强约 9 倍。偏振分辨 PL 光谱分别在近场和远场等离子体耦合时显示线性偏振和去偏振。 PL 增强的物理起源可归因于大的局部场增强和快速谐振能量转移。
A hybrid optical nanostructure of plasmon-coupled SQDs was developed for photonic applications. The coupling distances between the mono-layers of Au nanoparticles with a surface concentration of ~9.18 × 10−4 nm−2 and CdSe/ZnS SQDs with that of ~3.7 × 10−3 nm−2 were controlled by PMMA plasma etching. Time-resolved spectroscopy of plasmon-coupled SQDs revealed a strong shortening of the longest lifetime and ~9-fold PL enhancement. Polarization-resolved PL spectroscopy displayed linear polarization and depolarization at near- and far-field plasmon-coupling, respectively. The physical origin of PL enhancement could be attributable to both the large local field enhancement and the fast resonant energy transfer.