研究目的
To develop a method for directly monitoring Fano resonant behaviours of local electric fields inside a waveguide layer in multilayer structures and to understand the mechanism of Fano line shape generation.
研究成果
The study successfully developed a method to directly monitor Fano resonant behaviours of local electric fields inside a waveguide layer using fluorescence of embedded dye molecules. The experimental and theoretical results confirmed that the observed Fano line shapes in the fluorescence spectra are due to the Fano resonant behaviours of the local electric fields. This approach offers new possibilities for fluorescence spectral shaping, biosensing, and light-emitting devices based on Fano resonance conditions.
研究不足
The study is limited by the assumptions made in the point dipole model and the use of literature values for optical constants at the emission wavelength, which may not accurately represent the experimental conditions. Additionally, the exact distribution and orientation of dye molecules within the waveguide layer were not known, potentially affecting the accuracy of the theoretical predictions.
1：Experimental Design and Method Selection:
The study involved preparing all-dielectric multilayer structures with two polystyrene waveguide layers separated by a polyvinyl alcohol spacer layer, one of which was doped with fluorescent dye molecules. Fluorescence spectra were measured in a Kretschmann attenuated-total-reflection geometry as a function of the angle of incidence of the excitation light.
2：Sample Selection and Data Sources:
The samples were prepared by spin coating, with one waveguide layer doped with DCM molecules. The fluorescence and absorption spectra of a single layer were measured using a UV–visible spectrometer and a spectrofluorometer.
3：List of Experimental Equipment and Materials:
Equipment included a semiconductor laser for excitation, a monochromator equipped with a photomultiplier tube for fluorescence detection, and a photo diode for measuring reflected light intensity. Materials included polystyrene, polyvinyl alcohol, and DCM dye molecules.
4：Experimental Procedures and Operational Workflow:
The sample was attached to a SF11 prism in a Kretschmann ATR configuration. The fluorescence intensity was measured as a function of the angle of incidence of the excitation light, with simultaneous measurement of ATR spectra.
5：Data Analysis Methods:
The angle-scan fluorescence and ATR spectra were analyzed using electromagnetic calculations and fitted to a generalized Fano function to understand the Fano resonant behaviours.
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