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Bidimensional near-field sampling spectrometry

机译:二维近场采样光谱法

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We report on a concept of compact optical Fourier-transform spectrometer based on bidimensional (2D) spatial sampling of a confined interferogram. The spectrometer consists of a nanostructured glass surface on which two light beams interfere in total internal reflection. Subwavelength spatial sampling of the interferogram near field is achieved by introducing a tilt angle between a 2D array of optical nanoantennas and the interferogram pattern. The intensity distribution of the scattered light is recorded on a 2D CCD camera, and a one-dimensional Fourier transform of the interferogram is used to recover the input light spectrum. Experimental results show a wide spectral bandwidth in the visible range, down to 380 nm, with spectral resolution of 1.6 nm around 780 nm.
机译:我们报告基于紧凑型干涉图的二维(2D)空间采样的紧凑型光学傅立叶变换光谱仪的概念。光谱仪由纳米结构的玻璃表面组成,两个光束在该玻璃表面上干扰全内反射。干涉图近场的亚波长空间采样是通过在光学纳米天线的2D阵列和干涉图图案之间引入倾斜角来实现的。散射光的强度分布记录在2D CCD摄像机上,并且干涉图的一维傅里叶变换用于恢复输入光谱。实验结果表明,可见光范围内的光谱带宽很宽,低至380 nm,光谱分辨率约为780 nm,为1.6 nm。

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