ON THE PHYSICS OF FEMTO-SECOND ELECTRICAL PULSE GENERATION IN TRANSMISSION-LINE GAPS

Xing ZHOU

School of Electrical and Electronic Engineering
Nanyang Technological University
Nanyang Avenue, Singapore 639798, Republic of Singapore

Figures

Fig. 1 | Fig. 2 | Fig. 3 | Fig. 4 | Fig. 5 | Fig. 6

Fig-1

Fig. 1 (a) Sketch of sample and measurement setup for non-uniform gap illumination. (b) Top view of the MSM transmission line. The probing spots labeled 'A,' 'B,' 'C,' and 'D' correspond schematically to the measurement conditions in [1], [2], [3], and [5], respectively.

Fig-2a (a)
Fig-2b (b)
Fig-2c (c)

Fig. 2 Schematic illustration of the measured electrical signals probed at the spots shown in Fig. 1 (b) ('A2' corresponds to that when the bias polarity is reversed [1].)

Fig-3

Fig. 3 Schematic illustration for the physical mechanism of non-uniform gap illumination. (a) Top view of the sample showing the excitation and probing spots. (b) Surface-field distribution across the gap before and after photoexcitation. (c) Local-field transient at the probing spots.

Fig-4

Fig. 4 Calculated surface-field distribution across the gap sampled at t = 0, 1, 10, and 100 ps.

Fig-5

Fig. 5 Local-field transient probed at the cathode (x = 25 µm), in the center (x = 50 µm), at the edge of the excitation spot (x = 64.4 µm), and at the anode (x = 75 µm).

Fig-6

Fig. 6 Terminal-current and terminal-charge transients (outside scale) superimposed on the local-field transient Fs (probed at the anode, x = 75 µm) and its time derivative dFs/dt (inside scale).