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Interference fringes in thin films cause deviations from the Beer-Lambert law. This study introduces a wave optics method to correct these spectral deviations, ensuring accurate absorption measurements.

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Area of Science:

  • Optics
  • Materials Science
  • Spectroscopy

Background:

  • Refractive index mismatches cause interference fringes due to multiple reflections in thin films.
  • These fringes lead to undulating baselines and deviations from the Beer-Lambert law by altering electric field intensities.
  • Accurate spectral analysis requires the removal of these interference effects.

Purpose of the Study:

  • To introduce a novel formalism for correcting interference fringes in transmittance spectra.
  • To provide a method for rectifying deviations from the Beer-Lambert law caused by wave interference.
  • To establish a benchmark for evaluating other interference fringe removal techniques.

Main Methods:

  • Developed a formalism based on wave optics for interference fringe correction.
  • Applied the method to correct transmittance spectra of Poly(methyl methacrylate) layers on silicon substrates.
  • Utilized theoretical calculations for comparison and validation.

Main Results:

  • Successfully removed interference effects from transmittance spectra.
  • Obtained corrected baselines that closely match calculated spectra.
  • Demonstrated the effectiveness of the wave optics formalism for fringe removal.

Conclusions:

  • The proposed wave optics formalism effectively corrects interference fringes in spectral data.
  • This method ensures adherence to the Beer-Lambert law by removing artifacts from multiple reflections.
  • The formalism serves as a reliable benchmark for assessing other interference correction techniques.