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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

Multiple path length dual polarization interferometry.

Paul D Coffey1, Marcus J Swann, Thomas A Waigh

  • 1School of Physics and Astronomy, The University of Manchester, Manchester, UK.

Optics Express
|June 25, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces an optical sensor for precisely measuring ultrathin film thickness and refractive index. The novel sensor enables in situ and ex situ analysis of adsorbed layers using a dual polarization interferometer.

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Area of Science:

  • Optical sensing
  • Materials science
  • Surface analysis

Background:

  • Accurate characterization of ultrathin films is crucial for advanced material applications.
  • Existing methods for analyzing adsorbed layers often lack precision or in situ capabilities.

Purpose of the Study:

  • To develop an optical sensor for quantitative analysis of ultrathin films and adsorbed layers.
  • To enable simultaneous measurement of layer thickness and refractive index (density).
  • To facilitate both in situ and ex situ measurements.

Main Methods:

  • Utilized a Young's interferometer arrangement with two polarizations for in situ measurements.
  • Developed a multiple path length dual polarization interferometer (MPL-DPI) in a solid-state waveguide for ex situ measurements.
  • Demonstrated the technique using ultrathin layers of poly(methylmethacrylate) and human serum albumin.

Main Results:

  • Successfully quantified both thickness and refractive index of ultrathin films.
  • Showcased the sensor's capability for both in situ and ex situ analysis.
  • Validated the technique with model biological and polymer layers.

Conclusions:

  • The developed optical sensor provides a versatile and accurate method for characterizing ultrathin films.
  • The MPL-DPI offers a robust platform for ex situ analysis of adsorbed layers.
  • This technology has potential applications in various fields requiring precise surface analysis.