研究目的
Investigating the effects of plasmonic gap mode formation on the enhancement of photoluminescence of molecular emitters in a planar plasmonic nanocavity structure.
研究成果
The study demonstrated that the plasmonic cavity nanostructures consisting of a monolayer of metal NPs and metal film are effective for tunable enhancement of the absorption and emission of light by single molecules located in such cavities. The variation of the gap thickness allows for controllable tuning of the spectral position and enhancement factor of the light emission, which can be utilized in novel nanophotonics devices and for highly sensitive detection of molecules.
研究不足
The study is limited to the specific nanostructure of Au NPs monolayer/shellac-dye film/Au film and the range of spacer thicknesses (8–47 nm). The effects of other materials or thicknesses outside this range were not explored.
1：Experimental Design and Method Selection:
The study involved the fabrication of a three-layer planar Au NPs monolayer/shellac-dye film/Au film nanostructure with varying spacer thicknesses (8–47 nm) to study the effects of plasmonic gap mode formation on light extinction and photoluminescence.
2：Sample Selection and Data Sources:
The samples were prepared using thermal vacuum deposition and annealing, with the thickness of the spacer layer varied to study its effect on the plasmonic properties.
3：List of Experimental Equipment and Materials:
A Cary 60 UV-VIS spectrophotometer and a Shimadzu RF-6000 spectrofluorophotometer were used for extinction and photoluminescence measurements, respectively.
4：Experimental Procedures and Operational Workflow:
The optical density and photoluminescence spectra were measured from different areas of the sample to compare the effects of the Au film on the plasmonic properties.
5：Data Analysis Methods:
The spectra were analyzed to determine the enhancement factors and spectral shifts, with FDTD calculations used to model the electric field intensity in the gap.
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