研究目的
Investigating the dispersion characteristics of surface plasmon polaritons (SPPs) in a plasmonic crystal (PlC) waveguide to understand and control SPP pulses for future optical information processing and communication technologies.
研究成果
The PlC waveguide exhibits potential advantages in manipulating ultrashort pulses due to its linear dispersion with small group velocity over a wide energy range. The study revealed unique features of guided SPP modes, including energy-dependent phase shifts and the formation of a waveguide bandgap (WBG), contributing to the understanding and control of SPP pulses for optical technologies.
研究不足
The dispersion was mainly measured inside the light cone in this fundamental study, which may limit practical applications. Shifting the dispersion outside the light cone is suggested for practical use.
1：Experimental Design and Method Selection:
The study utilized angle-resolved cathodoluminescence in a scanning transmission electron microscope (STEM) to investigate the dispersion characteristics of SPPs in a PlC waveguide.
2：Sample Selection and Data Sources:
The PlC waveguide was composed of a silver dot array with a triangular lattice and silver plane surface, structured by electron beam lithography and physical deposition.
3：List of Experimental Equipment and Materials:
A STEM equipped for angle-resolved cathodoluminescence measurements was used.
4：Experimental Procedures and Operational Workflow:
The dispersion pattern was measured in the PlC waveguide area, angle-scanned parallel to the direction of the waveguide. Photon map imaging was also performed to understand the origin of the waveguide bandgap (WBG).
5：Data Analysis Methods:
The guided SPP mode was modeled considering an energy-dependent phase shift, and theoretical curves were compared with experimental data.
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