Fiber tip-based electron source
Fiber tip-based electron source
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基于光纤尖端的电子源
DOI：
10.1116/1.4902016
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发表时间：
2015
影响因子：
1.4
通讯作者：
R. Miller
中科院分区：
文献类型：
--
作者：
Albert Căsăndruc;G. Kassier;Haider Zia;R. Bücker;R. Miller
作者报告的第一个实验特性的纤维尖端为基础的电子源，电子发射可以触发电场和光激发。我们的方法包括涂层的商业100 nm的顶点大小的近场扫描光学显微镜光纤尖端的开口孔径与10 nm厚的钨（W）层，这是背照的405 nm的连续波激光束中存在的提取电场。尽管由于亚波长孔径尺寸的光纤的非常低的光传输，测量显示出一个明显增强的发射时，光激发的W层相对于纯场致发射。的发射响应时间是慢于光学触发时间，这表明热效应是占主导地位的研究制度。为了支持这一假设，作者制作了一个纳米热电偶探针的基础上的Pt/Au结和测量的尖端温度的时间响应。测量的合闸时间为...
The authors report on the first experimental characterization of a fiber tip-based electron source, where electron emission can be triggered by both electric field and optical excitation. Our approach consists of coating the open aperture of a commercial 100 nm apex size near-field scanning optical microscopy fiber tip with a 10 nm thick tungsten (W) layer, which is back-illuminated by a 405 nm continuous-wave laser beam in the presence of an extraction electric field. Despite the very low optical transmission of the fiber due to the subwavelength aperture size, measurements show a clearly enhanced emission when photoexciting the W layer with respect to pure field emission. The emission response time is slower than the optical trigger time, suggesting that thermal effects are predominant in the studied regime. To back up this hypothesis, the authors fabricated a nanometric thermocouple probe based on a Pt/Au junction and measured the temporal response of the tip temperature. The measured switch-on time fo...