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Related Experiment Video

Updated: Jul 1, 2025

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

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Encoding terahertz holographic bits with a computer-generated 3D-printed phase plate.

E Constable¹, J Gospodaric², A Pimenov²

¹TU Wien, Solidstate spectroscopy, Vienna, Austria. evan.constable@tuwien.ac.at.

Scientific Reports

|March 6, 2024

Summary

Researchers created a sub-terahertz holographic image of a 576-bit data code, encoding a Bitcoin private key. This terahertz holographic memory uses 3D-printed phase plates for simplified optical setups and secure data storage.

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Area of Science:

Optics and Photonics
Information Storage
3D Printing Technologies

Background:

Holographic data storage offers high density but often requires complex optical systems.
Terahertz (THz) frequencies present unique opportunities for advanced imaging and data transmission.
3D printing enables rapid prototyping and fabrication of complex optical elements.

Purpose of the Study:

To demonstrate a simplified terahertz holographic imaging system for data storage.
To encode and retrieve a cryptographic private key using a 3D-printed holographic element.
To explore the potential of terahertz holographic memory with accessible fabrication methods.

Main Methods:

Design of a diffractive phase-plate element using a modified Gerchberg-Saxton algorithm.
Fabrication of the phase plate from polylactic acid via fused deposition modeling (3D printing).
Optical setup utilizing a 0.14 THz source, the phase plate, and a scanning detector.

Main Results:

Successful generation of a sub-terahertz holographic image of a 576-bit data code.
Encoding of a Bitcoin private key within the data code.
Demonstration of information retrieval from the terahertz holographic memory.

Conclusions:

A simplified optical setup for terahertz holographic imaging is achievable with 3D-printed elements.
Terahertz holographic memory is a viable concept for secure data storage, demonstrated by encoding a private key.
Consumer-level 3D printing offers a practical fabrication route for terahertz holographic storage media.