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Title: Self-referenced single-shot THz detection

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.25.016140· OSTI ID:1380108
 [1];  [2];  [3];  [3];  [4];  [3]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Alberta, Edmonton, AB (Canada). Dept. of Electrical and Computer Engineering
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Electrical and Computer Engineering

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. Here, 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 × 107 S 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.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC02-76SF00515; FWP 100182
OSTI ID:
1380108
Journal Information:
Optics Express, Vol. 25, Issue 14; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (3)

Toward quasi-DC conductivity of warm dense matter measured by single-shot terahertz spectroscopy journal October 2018
Corrective re-gridding techniques for non-uniform sampling in time-domain terahertz spectroscopy journal January 2019
Corrective Re-gridding Techniques for Non-Uniform Sampling in Time Domain Terahertz Spectroscopy text January 2017