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arXiv 1107.3632cond-mat.mes-hallphysics.optics
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角分辨阴极发光光谱学

Angle-resolved cathodoluminescence spectroscopy

T. Coenen, E. J. R Vesseur, A. Polman

摘要:

我们提出了一种新的阴极发光光谱技术,它结合了深亚波长激发分辨率与角度分辨检测能力。阴极发光发射由抛物面反射镜(有效NA=0.96)收集,并投射到二维CCD阵列上。方位角和极性发射模式直接从图像推导。作为证明的原则,我们使用的技术来测量的角分布的过渡辐射从一个单晶金表面下30 keV的电子辐照。我们发现,实验与理论非常吻合,说明了这种新技术的深亚波长尺寸的光子结构的表征的潜力。

英文摘要:

We present a novel cathodoluminescence spectroscopy technique which combines a deep subwavelength excitation resolution with angle-resolved detection capabilities. The cathodoluminescence emission is collected by a paraboloid mirror (effective NA=0.96) and is projected onto a 2D CCD array. The azimuthal and polar emission pattern is directly deduced from the image. As proof of principle we use the technique to measure the angular distribution of transition radiation from a single crystalline gold surface under 30 keV electron irradiation. We find that the experiment matches very well with theory, illustrating the potential of this new technique for the characterization of photonic structures with deep subwavelength dimensions.

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