Calibration of terahertz sampling detectors for intense unipolar picosecond current pulses in waveguides

被引:2
作者
Diaz, Eva [1 ]
Anadon, Alberto [1 ]
Morassi, Martina [2 ]
Hehn, Michel [1 ]
Lemaitre, Aristide [2 ]
Gorchon, Jon [1 ]
机构
[1] Univ Lorraine, CNRS, IJL, F-54000 Nancy, France
[2] Univ Paris Saclay, Ctr Nanosci & Nanotechnol, CNRS, F-91120 Palaiseau, France
关键词
ELECTRICAL PULSES; GAAS; GENERATION; PROBE;
D O I
10.1063/5.0169020
中图分类号
O59 [应用物理学];
学科分类号
摘要
Terahertz pulses are nowadays commonly used in many areas of condensed matter physics to access material properties and explore transport phenomena at fast timescales. However, little work has been devoted to the full characterization of such pulses when confined in waveguides. In this work, we fabricate terahertz photoconductive switch detectors, located at various points along a coplanar waveguide, and sample the electrical pulses that pass by the detectors. Two different but consistent methods were developed to calibrate the pulse amplitude. Notably, we synchronize a commercial pulse generator with the laser in order to sample nanosecond-wide pulses with the photoswitch detectors, effectively turning the setup into an on-chip high-frequency sampling oscilloscope. Both methods give identical results on pulse current, voltage, and field amplitudes and enable an absolute characterization of the electrical pulse propagation along the waveguide. These techniques constitute a reliable tool to explore (non-linear) phenomena such as current or field induced magnetization switching or phase transitions, which take place at high THz intensities.
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页数:5
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