研究目的
To demonstrate a polarization-controlled tunable structured plasmonic fields (SPF) for subdiffractional imaging, eliminating the need for mechanical moving parts.
研究成果
The study demonstrated polarization-controlled tunable structured plasmonic fields (SPF) for subdiffractional imaging, enabling precise control of the fringes of structured illumination without mechanical moving parts. This approach has potential applications in super-resolution imaging, chemical analysis, and maskless lithography.
研究不足
The lateral shift of the SPI fringe is not strictly linear with the polarization of incident beams due to unequal coupling efficiency of the fishbone grating between orthogonal linearly polarizations. The conversion efficiency can be further improved by optimizing the resonant properties of the nano apertures and by increasing the columns of the fishbone grating.
1：Experimental Design and Method Selection:
Utilized a fishbone-shaped metasurface on a thin gold film to generate surface plasmon interference (SPI) for structured illumination.
2：Sample Selection and Data Sources:
Fabricated fishbone grating arrays on a gold film using focused ion beam (FIB) and characterized using near-field scanning optical microscopy (NSOM).
3：List of Experimental Equipment and Materials:
He-Ne laser, NSOM system with an inverted microscope, photomultiplier tube (PMT), aluminum-coated NSOM probe tip.
4：Experimental Procedures and Operational Workflow:
Illuminated the metasurface with linearly polarized light, varied the polarization angle, and measured the SPI patterns using NSOM.
5：Data Analysis Methods:
Analyzed the SPI patterns and their shifts with polarization angle changes using Fourier transform and numerical reconstruction algorithms.
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