We investigated the scanning differential heterodyne microscope response for a plasmonic metasurface-dielectric film system. Superresolution effect for microscope phase response with 6.5 superresolution coefficient in the vicinity of π optical phase increment was observed. Use of an additional dielectric film allowed local adjustment of the optical phase increment over a wide range (0 deg to 100 deg). The ability to adjust the width of the phase response function by changing the microscope heterodyne frequency has been demonstrated experimentally.

中文翻译：

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使用微分外差显微镜获得等离子体超表面π相阶跃相位图像的超分辨率

我们研究了等离子体超表面介电薄膜系统的扫描微分外差显微镜响应。在π光学相位增量附近观察到超分辨系数为6.5的显微镜相位响应的超分辨效应。使用附加介电膜可以在较宽的范围（0 度到 100 度）内局部调整光学相位增量。实验证明了通过改变显微镜外差频率来调整相位响应函数宽度的能力。