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Three-focal-spot terahertz diffractive optical element-iterative design and neural network approach
Optics Express
|April 6, 2021
Summary
Researchers developed novel diffractive optical elements (DOEs) for terahertz (THz) telecommunication, creating multiple focal spots. These 3D-printed DOEs offer improved efficiency and reduced noise for demultiplexing data signals.
Area of Science:
- Optics and Photonics
- Telecommunications Engineering
- Additive Manufacturing
Background:
- Signal demultiplexing in telecommunications requires radiation redistribution.
- Diffractive optical elements (DOEs) are suitable for terahertz (THz) applications, enabling multiple focal spots.
Purpose of the Study:
- To design and fabricate DOEs for focusing THz radiation into three focal spots.
- To explore symmetric and asymmetric focal spot distributions using iterative design.
- To investigate a novel neural network approach for performance optimization.
Main Methods:
- Iterative algorithm design for phase distribution.
- Sintering-based 3D printing using polyamide 12 (PA 12).
- Experimental characterization at 150 GHz frequency.
- Neural network-based optimization of phase delay maps.
Main Results:
- Successfully designed and fabricated DOEs producing three focal spots.
- Demonstrated novel iterative design for asymmetric focal spot patterns.
- Achieved functional 3D-printed DOEs for THz radiation focusing.
- Proposed a neural network method for enhancing DOE efficiency and reducing noise.
Conclusions:
- Diffractive optical elements offer a viable solution for THz signal demultiplexing.
- Iterative design and 3D printing enable the creation of complex DOE structures.
- Neural networks show promise for optimizing DOE performance in THz applications.
