光纤耦合超快扫描隧道显微镜

U. Keil, J. Hvam
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引用次数: 21

摘要

本文报道了一种在隧道电流电路中采用光导栅的扫描隧道显微镜。所述隧道尖端连接到具有集成光导开关的共面传输线上。所述开关通过一根光纤照射,该光纤牢固地附着在所述开关基板上。通过使用牢固附着的纤维,我们实现了极好的再现性和不受约束的尖端定位。我们观察到一个瞬态信号,在隧道模式下脉冲宽度为2.9 ps,在接触模式下脉冲宽度为5 ps。该仪器应用于共面波导模结构的研究。测量结果表明,探头在接触状态下可作为瞬态电压检测器,在隧道模式下可作为电容耦合瞬态场检测器。我们不测量欧姆隧穿电流的瞬态电压变化。从这个意义上说,电脉冲传播的空间分辨率在接触模式下比在隧道模式下更好。
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Fiber Coupled Ultrafast Scanning Tunneling Microscope
We report on a scanning tunneling microscope with a photoconductive gate in the tunneling current circuit. The tunneling tip is attached to a coplanar transmission line with an integrated photoconductive switch. The switch is illuminated through a fiber which is rigidly attached to the switch substrate. By using a firmly attached fiber we achieve an excellent reproducibility and unconstrained positioning of the tip. We observe a transient signal with 2.9 ps pulse width in tunneling mode and 5 ps in contact mode. The instrument is applied to investigating the mode structure on a coplanar waveguide. The measurements show that the probe works as a transient voltage detector in contact and a capacitively coupled transient field detector in tunneling mode. We do not measure the transient voltage change in the ohmic tunneling current. In this sense, the spatial resolution for propagating electrical pulses is better in contact mode than in tunneling mode.
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