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Broadband micro-transient absorption spectroscopy enabled by improved lock-in amplification.

Hossein Ardekani1, Ryan L Wilmington1, Mounika Vutukuru2

  • 1Department of Physics, NC State University, Raleigh, North Carolina 27695, USA.

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|October 31, 2021
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Summary

We enhanced lock-in detection sensitivity for ultrafast spectroscopy. This affordable method improves signal detection for nanoscale materials characterization.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Advancements in materials science necessitate characterization techniques for nanoscale features on ultrafast timescales.
  • Atomically thin samples yield extremely low signals, limiting experimental feasibility for many techniques.
  • Transient absorption spectroscopy (TAS) requires high sensitivity for analyzing ultrafast phenomena.

Purpose of the Study:

  • To present an affordable and easily implementable method to significantly enhance the sensitivity of lock-in detection systems.
  • To improve signal detection capabilities for ultrafast pump-probe spectroscopy, particularly for low-signal experiments.
  • To demonstrate the practical application of enhanced lock-in detection for nanoscale material characterization.

Main Methods:

  • Implementation of a tuned RC circuit at the avalanche photodiode output for electric pulse shaping.
  • Incorporation of a "peak detector" circuit for additional pulse shaping and signal enhancement.
  • Utilizing these circuits to improve lock-in detection sensitivity in TAS experiments.

Main Results:

  • Demonstrated multiple orders of magnitude improvement in lock-in detection sensitivity.
  • Successfully performed benchmark measurements on a white-light continuum signal.
  • Achieved micro-transient absorption spectroscopy on a few-layer transition metal dichalcogenide sample, showcasing enhanced capabilities.

Conclusions:

  • The presented RC and peak detector circuits offer a practical and affordable solution for enhancing lock-in detection sensitivity.
  • This method significantly expands the feasibility of high-sensitivity experimental schemes in ultrafast pump-probe spectroscopy.
  • Enables advanced characterization of nanoscale materials, including atomically thin samples, with improved signal-to-noise ratios.