Brandon K. Russell, Benjamin K. Ofori-Okai, Zhijiang Chen, Matthias C. Hoffmann, Ying Y. Tsui, and Siegfried H. Glenzer
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-14-16140&origin=search
We demonstrate a self-referencing method to reduce noise in a single-shot terahertz detection scheme. By splitting a single terahertz pulse and using a reflective echelon, both the signal and reference terahertz time-domain waveforms were measured using one laser pulse. Simultaneous acquisition of these waveforms significantly reduces noise originating from shot-to-shot fluctuations. We show that correlation function based referencing, which is not limited to polarization dependent measurements, can achieve a noise floor that is comparable to state-of-the-art polarization-gated balanced detection. Lastly, we extract the DC conductivity of a 30 nm free-standing gold film using a single THz pulse. The measured value of σ0 = 1.3 ± 0.4 × 107S m−1 is in good agreement with the value measured by four-point probe, indicating the viability of this method for measuring dynamical changes and small signals.
© 2017 Optical Society of America
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