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A Sensitive and Versatile Thickness Determination Method Based on Non-Inflection Terahertz Property Fitting.

Xuequan Chen1, Emma Pickwell-MacPherson2,3

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong 999077, China. xqchen@link.cuhk.edu.hk.

Sensors (Basel, Switzerland)
|September 25, 2019
PubMed
Summary
This summary is machine-generated.

Accurate terahertz spectroscopy thin-film thickness determination is achieved using a novel fitting method. This technique overcomes limitations of physical measurements and prior numerical approaches for diverse materials.

Keywords:
exponential functionfittinginflection pointthickness uncertaintythin-film characterization

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Area of Science:

  • Terahertz (THz) spectroscopy
  • Materials science
  • Optical property characterization

Background:

  • Terahertz spectroscopy accuracy for thin films is limited by thickness uncertainty.
  • Conventional physical thickness measurements are inaccurate for films <100s of micrometers.
  • Existing numerical methods struggle with dispersive and absorptive materials.

Purpose of the Study:

  • To develop a novel, accurate method for terahertz spectroscopy thin-film thickness determination.
  • To characterize optical properties of diverse thin-film materials.
  • To overcome limitations of existing measurement and analysis techniques.

Main Methods:

  • Proposed a new method involving fitting a non-inflection offset exponential function to optical properties.
  • Utilized transmission measurements for thin-film polymer, water, and lactose pallet samples.
  • Validated theoretical predictions through experimental verification.

Main Results:

  • Accurate thickness determination was achieved for various thin-film materials.
  • The method successfully characterized optical properties of achromatic, dispersive, transparent, absorptive, featureless, and resonant materials.
  • Demonstrated superior versatility and sensitivity compared to current state-of-the-art techniques.

Conclusions:

  • The novel fitting method provides accurate thin-film thickness and property characterization in terahertz spectroscopy.
  • The technique is broadly applicable across diverse material types and spectral features.
  • This method offers significant potential for widespread adoption in research and industry.