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THz Bragg structures fabricated with additive manufacturing.

C Harrison Brodie, Isaac Spotts, Christopher M Collier

|September 14, 2023

Summary

3D printed Terahertz (THz) Bragg structures offer tunable frequency filtering for advanced THz applications. This fabrication method simplifies creating specialized THz photonic elements for science and technology.

Area of Science:

Terahertz (THz) science and technology
Photonic devices
Additive manufacturing

Background:

Advancing THz science necessitates specialized photonic elements with tailored absorption and refractive properties.
Additive manufacturing, particularly 3D printing, offers a simplified approach to fabricating complex THz photonic structures.
Periodic Bragg structures are key THz photonic elements for selective frequency filtering.

Purpose of the Study:

To present a THz Bragg structure fabricated using 3D printing.
To characterize the material properties and investigate the theoretical operation of the 3D printed THz Bragg structure.
To experimentally validate the performance of the 3D printed THz Bragg structure for tunable frequency filtering.

Main Methods:

Fabrication of a THz Bragg structure using fused filament fabrication (3D printing) with high-impact polystyrene.

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Characterization of the polystyrene material using Terahertz time-domain spectroscopy (THz-TDS).

Electromagnetic simulations using finite-difference time-domain (FDTD) methods to model the structure's geometry and operation.

Experimental evaluation of the fabricated THz Bragg structure using a dedicated THz test bed.

Main Results:

Successful fabrication of a 3D printed THz Bragg structure from high-impact polystyrene.
Characterization of the polystyrene's THz-regime optical properties.
Demonstration of tunable frequency filtering capabilities through agreement between FDTD simulations and experimental results.
Validation of the 3D printing approach for creating functional THz photonic elements.

Conclusions:

3D printing provides an accessible and effective method for fabricating THz Bragg structures.
The presented THz Bragg structure exhibits tunable frequency filtering, validated by simulation and experiment.
This work advances the development of specialized THz photonic elements, paving the way for broader THz technology applications.