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Related Experiment Video

Updated: Jun 16, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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New page-composer for holographic data storage.

B Hill, K P Schmidt

|February 4, 2010

Summary

Single crystal Cadmium Sulfide (CdS) enables fast, high-contrast binary data display. Its thermal band edge shift allows for rapid modulation of transmittance in a page-composer device.

Area of Science:

Materials Science
Optoelectronics
Solid-State Physics

Background:

Cadmium Sulfide (CdS) single crystals possess a steep band edge at 0.515 micrometers.
Modulating transmittance via thermal band edge shifts is a key optical principle.

Purpose of the Study:

To develop a matrix-addressed page-composer for binary data presentation.
To utilize the thermal properties of CdS for optical modulation.

Main Methods:

Applying short switching pulses (20-50 V) to transparent heating elements.
Inducing a 70°C temperature shift in thin CdS crystals within 100 microseconds.
Utilizing time-multiplex heating for fast parallel switching.

Main Results:

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Achieved contrast ratios exceeding 800 and optical efficiencies of 50% in 10-20 micrometer thick samples.

Demonstrated fast parallel switching of 25 elements in a 5x5 CdS-page-composer.

Confirmed feasibility of larger arrays (16x18) with millisecond accessibility.

Conclusions:

CdS single crystals are effective for high-performance page-composer applications.
The thermal modulation technique offers a viable path for rapid binary data display.
Scalable matrix addressing in page-composers is achievable with this technology.