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Azimuthal multiplexing 3D diffractive optics
1Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Boulder, Colorado, 80309, USA. hawa8774@colorado.edu.
Scientific Reports
|April 17, 2020
Summary
Researchers developed 3D diffractive optics using azimuthal multiplexing to encode multiple information pages. Rotating diffractive layers allows independent readout of these encoded pages, enhancing optical information capacity.
Area of Science:
- Optics and Photonics
- Information Optics
- Holography
Background:
- Classical diffractive optics (2D diffractive optical elements and computer-generated holograms) modulate light on a single plane, limiting functionalities.
- Extending diffractive optics to three dimensions (3D) offers new capabilities like space-variant functions and enhanced information capacity.
- Despite progress in metasurface diffraction, 3D diffractive optics remain underexplored.
Purpose of the Study:
- Introduce and demonstrate the novel concept of azimuthal multiplexing in 3D diffractive optics.
- Enable encoding and independent readout of multiple information pages within a single optical element.
Main Methods:
- Proposed and designed 3D diffractive optical elements utilizing multilayer structures.
- Employed an iterative projection optimization algorithm for inverse design.
- Fabricated multilevel phase layers using photolithography for experimental validation.
Main Results:
- Successfully demonstrated the azimuthal multiplexing effect in 3D diffractive optics.
- Showcased the ability to encode multiple information pages.
- Achieved independent readout of encoded information by rotating diffractive layers.
- Experimental results validated the predicted performance of the designed elements.
Conclusions:
- Azimuthal multiplexing in 3D diffractive optics offers a new paradigm for optical information processing.
- Multilayer diffractive optical elements are a viable platform for implementing this multiplexing technique.
- Further research can explore the limitations and expand the potential applications of this technology.
