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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Lensless optical data embedding system using concealogram and cascaded digital Fresnel hologram.

Hone-Ene Hwang¹, Hsuan T Chang, Wen-Nung Lie

¹Department of Electronic Engineering, Chung Chou Institute of Technology, Yuan-lin 510, Taiwan. n741@ms26.hinet.net

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|July 8, 2011

Summary

A novel lensless optical data embedding system uses a computer-generated concealogram and digital Fresnel hologram (DFH) for secure data extraction without lenses. System security is enhanced using secret keys like longitudinal positions and wavelength.

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Area of Science:

Optics and Photonics
Information Security
Data Encryption

Background:

Traditional optical data embedding systems often require complex lens arrangements.
Lensless systems offer potential for miniaturization and simplified optical setups.
Digital holography provides a powerful tool for optical data storage and retrieval.

Purpose of the Study:

To propose a robust lensless optical data embedding system.
To demonstrate secure data extraction without the need for lenses.
To investigate methods for enhancing system security and robustness.

Main Methods:

A system combining a computer-generated concealogram and a digital Fresnel hologram (DFH) was designed.
The concealogram and DFH were cascaded, acting as input and filter planes, respectively.
Plane wave illumination was used to extract hidden data at the output plane.

Main Results:

Successful lensless optical data embedding and extraction were demonstrated.
The system showed robustness against noise and distortion.
Adjusting longitudinal positions and wavelength served as secret keys for enhanced security.

Conclusions:

The proposed lensless optical system offers a secure and robust method for data embedding.
The integration of concealograms and DFHs provides a lensless solution for optical data security.
The system's security can be further strengthened by utilizing secret keys like wavelength and spatial positioning.