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Related Concept Videos

Distance Corrections01:15

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Distortion Correction for an Imaging Ellipsometer.

Thong Q Ly1, Steven Baldelli1

  • 1Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States.

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|March 21, 2020
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A novel imaging add-on for nulling ellipsometry corrects angular distortion and improves focus. This optical grating and relay lens system achieves high resolution imaging for diverse materials without complex post-processing.

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Area of Science:

  • Optical Engineering
  • Materials Science
  • Surface Science

Background:

  • Ellipsometry is a powerful technique for characterizing thin films and surfaces.
  • Conventional ellipsometry often lacks direct imaging capabilities and can suffer from angular distortion.
  • Improving spatial resolution and field of view in ellipsometric imaging is crucial for detailed surface analysis.

Purpose of the Study:

  • To design, build, and test a simple imaging add-on for nulling ellipsometry.
  • To correct angular distortion and improve depth of focus in ellipsometric imaging.
  • To achieve high-resolution imaging of various material surfaces.

Main Methods:

  • Integration of a relay lens and an optical grating with a nulling ellipsometer.
  • Utilizing the modified system to image standardized silicon wafer, graphene on silicon, self-assembled monolayers, and lipid mixtures.
  • Characterizing spatial resolution, normal resolution, and field of view.

Main Results:

  • Successful image contrast achieved on diverse sample types including silicon, graphene, and lipid mixtures.
  • Correction of angular distortion and depth of focus demonstrated.
  • Achieved spatial resolution of 4.38 μm (incident) and 7.81 μm (perpendicular), with 3 Å normal resolution.
  • Maintained a large field of view (≥ 720 μm × 550 μm) without line scanning or post-processing.

Conclusions:

  • The developed imaging add-on effectively enhances nulling ellipsometry for distortion-free surface imaging.
  • The system offers high spatial and normal resolution with a large field of view, suitable for various material characterizations.
  • Further resolution improvements may be possible with higher numerical aperture optics.