As a plasmonic absorber for short-wavelength infrared hyperspectral imaging, a silicon-coated gold nanodiffraction grating structure is proposed. This plasmonic absorber leads to absorption peaks in short-wavelength infrared region by the high refractive index of silicon coating on gold grating. It is relatively easy to fabricate with smaller size than those of already known absorbers. By performing fabrication, simulation, and measurement, we demonstrate the sharp absorption peaks of short-wavelength infrared light using only 400–1000 nm grating interval. We believe this miniaturized absorber will be able to be applied to hyperspectral imaging without a spectroscope owing to its sharp absorption peak at a specific wavelength.

中文翻译：

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硅涂层金纳米衍射光栅结构作为短波长红外光的等离子体吸收剂

作为用于短波长红外高光谱成像的等离子体吸收体，提出了一种硅涂层金纳米衍射光栅结构。这种等离子体吸收器通过金光栅上硅涂层的高折射率导致短波长红外区域的吸收峰。与已知吸收器的尺寸相比，制造起来相对容易。通过制造、模拟和测量，我们证明了仅使用 400-1000 nm 光栅间隔的短波长红外光的尖锐吸收峰。我们相信这种小型化的吸收器将能够在没有分光镜的情况下应用于高光谱成像，因为它在特定波长处具有尖锐的吸收峰。