Shaobo Yang, Yueh-Chi Lee, Yu-Sheng Lin, Li-Ping Liang, Yang Kuo, Chih-Chung Yang
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引用次数: 0
Abstract
The reduction of the photoluminescence (PL) decay time of a colloidal quantum dot (QD) inserted into an Ag or Au surface nanohole and the efficiency enhancement of the Förster resonance energy transfer (FRET) from a green-emitting QD into a red-emitting QD are first experimentally demonstrated. Besides the factor of metal dissipation in the induced surface plasmon (SP) coupling process, the reduced PL decay time is attributed to the QD emission efficiency increase caused by the SP-coupling-involved nanoscale-cavity effect. Numerical simulation studies are undertaken to confirm the feasible enhancements of QD emission, FRET, and color conversion efficiencies. In particular, by artificially changing the dielectric constant of Ag based on the Drude model, the effects of cavity resonance and SP coupling in producing the enhanced radiated power peaks can be differentiated. Such a peak can be formed when both conditions of cavity resonance and SP resonance are satisfied. In the case of a weaker (stronger) SP resonance, the combined resonance can lead to a stronger and sharper (weaker and broader) radiated power peak. The results in this paper indicate that a nanoscale metal cavity can be used for enhancing the emission and color conversion efficiencies of inserted light emitters.
期刊介绍:
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.