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Fast beam steering with a ferroelectric-liquid-crystal optical phased array.

David Engström¹, Michael J O'Callaghan, Chris Walker

¹Displaytech, Inc., Longmont, Colorado 80503, USA.

|March 24, 2009

Summary

We achieved rapid, efficient beam steering using a novel analog ferroelectric liquid crystal (FLC) spatial light modulator. This technology offers fast response times and high phase modulation for advanced optical applications.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Spatial light modulators (SLMs) are crucial for controlling light wavefronts.
Ferroelectric liquid crystals (FLCs) offer fast switching speeds for dynamic optical control.

Purpose of the Study:

To demonstrate fast and efficient beam steering using an analog ferroelectric liquid crystal spatial light modulator.
To characterize the phase modulation capabilities and response time of the FLC-SLM.

Main Methods:

Utilized a single 1x32 analog ferroelectric liquid crystal (FLC) spatial light modulator.
Employed a reflective-mode device incorporating a high-tilt FLC material (82° optic-axis switching).
Integrated a passive quarter-wave retarder between the FLC layer and a mirror.

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Main Results:

Achieved 91% of full 0-2pi phase modulation.
Demonstrated analog modulation with a response time of 200 microseconds.
Enabled fast and efficient beam steering capabilities.

Conclusions:

The developed analog FLC-SLM provides a viable solution for fast and efficient beam steering.
The device exhibits high phase modulation and rapid response times, suitable for dynamic optical systems.