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Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Updated: Jun 20, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Ferroelectric liquid-crystal digital scanner.

R McRuer, L R McAdams, J W Goodman

|September 23, 2009

Summary

This summary is machine-generated.

Researchers developed a novel digital scanner using liquid-crystal technology. This innovative design offers improved performance, reducing signal loss and crosstalk for enhanced optical scanning applications.

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Last Updated: Jun 20, 2026

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Area of Science:

Optoelectronics
Materials Science

Background:

Traditional optical scanners often face limitations in cost, integration, and performance.
Birefringent prisms are key components in optical scanning systems, but conventional designs can be expensive and bulky.

Purpose of the Study:

To report the design and performance of a new digital scanner.
To demonstrate the effectiveness of ferroelectric liquid-crystal switchable wave plates and passive nematic liquid-crystal prisms in optical scanning.

Main Methods:

The study utilized ferroelectric liquid-crystal (FLC) switchable wave plates and passive nematic liquid-crystal (NLC) prisms.
A 1 x 64 digital scanner was constructed and tested for performance metrics.
An active filter was employed to mitigate mispolarization crosstalk.

Main Results:

The developed liquid-crystal prisms serve as cost-effective and integrable birefringent optical components.
The 1 x 64 scanner achieved an average insertion loss of -5.3 dB.
The use of an active filter significantly reduced mispolarization crosstalk from -13 dB to below -25 dB.

Conclusions:

The integration of FLC switchable wave plates and NLC prisms offers a promising approach for advanced digital scanner design.
The demonstrated performance improvements, particularly in crosstalk reduction, highlight the potential of this technology for various optical applications.