| Title |
3D-printed multimode-interference-based bessel beamformer for terahertz dielectric waveguides |
| Authors |
Kumar, Ashish ; Ayyagari, Surya Revanth ; Ali, Muhsin ; Kašalynas, Irmantas ; Headland, Daniel ; Carpintero, Guillermo |
| DOI |
10.1109/LMWT.2025.3647140 |
| Full Text |
|
| Is Part of |
IEEE microwave and wireless technology letters.. Institute of electrical and electronics engineers (IEEE). 2026, vol. 00, p. 1-4.. ISSN 2771-957X. eISSN 2771-9588 |
| Keywords [eng] |
bessel beam ; cyclic olefin copolymer (CoC) ; multimode interference (MMI) ; slot waveguide termination (SWT) ; terahertz (THz) |
| Abstract [eng] |
We demonstrate a Bessel beamformer based on multimode interference (MMI) for the terahertz (THz) wave range. Unlike traditional Bessel beam generation methods, which often rely on bulky free-space optical setups, our approach leverages a 3D-printed cyclic-olefin-copolymer (COC) MMI structure fed from a dielectric waveguide (DW) with a λ/4 slotwaveguide termination (SWT) that provides an index-matched interface for low reflection. Based on this interface and the low losses of the constituent materials, the beamformer achieves a measured transmission efficiency of 93.9% at 275 GHz, with a propagating distance of 20 mm (∼20λ). Even at an extended distance of 35 mm (∼35λ), the beam maintains a 50% efficiency. This approach addresses key limitations of existing free-space methods, offering a workable guided-wave approach to launch a THz Bessel beam. |
| Published |
Institute of electrical and electronics engineers (IEEE) |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
|
