研究目的
Investigating the interaction between point dipoles and plasmonic particle arrays at the unit cell level to understand the enhanced emission of single fluorescent molecules coupled to a plasmonic particle array.
研究成果
The study demonstrates that stochastic super-resolution microscopy in conjunction with FDTD simulations can be used to study the enhanced emission of single molecules coupled to a plasmonic particle array at the nanometer scale. It finds that collective resonances allow for the engineering of the radiation pattern of an emitter to obtain directional emission, which can inform the rational design of optical devices based on plasmonic particle arrays.
研究不足
The study is limited by the resolution of the stochastic super-resolution microscopy technique and the complexity of disentangling the different contributions to the observed emission enhancement.
1：Experimental Design and Method Selection
The study uses stochastic super-resolution microscopy to map the enhanced emission of single fluorescent molecules coupled to a plasmonic particle array with ～20 nm in-plane resolution. FDTD simulations are employed to gain insight into the underlying mechanisms that modify the emission.
2：Sample Selection and Data Sources
The sample is composed of a hexagonal array of aluminum nanostructures with a lattice constant of 450 nm. The array is fabricated on fused silica using substrate conformal imprint lithography and reactive ion etching.
3：List of Experimental Equipment and Materials
A Zeiss AxioObserver 7 inverted optical fluorescence microscope, a 532 nm CW laser, a Hamamatsu ORCA-Flash 4.0 V3 sCMOS camera, and various optical filters are used for the experiments.
4：Experimental Procedures and Operational Workflow
The sample is illuminated with a 532 nm CW laser to image the fluorescence. The signal is imaged on a sCMOS camera, and the emission intensity is measured as the total number of detected photons. The positions of single molecules are localized by fitting their emission profiles to a two-dimensional Gaussian.
5：Data Analysis Methods
The measured changes in intensity are compared to FDTD simulations of single electric dipoles coupled to a finite plasmonic particle array to disentangle the contributions from modifications in the absorption rate, spontaneous decay rate, and directivity of the emission.
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