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3D-printed facet-attached optical elements for beam shaping in optical phased arrays
Optics Express
|December 23, 2022
Summary
We developed a 3D-printed optical beam shaper for phased arrays. This technology precisely controls light emission from waveguides, offering an alternative to traditional grating structures.
Area of Science:
- Optics and Photonics
- Microfabrication
- Waveguide Technology
Background:
- Optical phased arrays (OPAs) are crucial for beam steering.
- Current OPA designs often rely on grating structures with limitations.
- Precise alignment of beam-shaping elements to waveguides is challenging.
Purpose of the Study:
- To demonstrate a novel 3D-printed facet-attached element for OPAs.
- To enable integrated beam shaping and deflection with high precision.
- To offer an alternative to conventional grating-based beam steering.
Main Methods:
- Utilizing high-resolution multi-photon lithography for in-situ printing.
- Integrating freeform refractive surfaces and total-internal-reflection mirrors.
- Attaching the beam shaper directly to edge-emitting waveguide facets.
Main Results:
- Achieved a grating-lobe free steering range of ±30 degrees.
- Demonstrated a full-width-half-maximum beam divergence of approximately 2 degrees.
- Ensured precise alignment with on-chip waveguide structures.
Conclusions:
- The 3D-printed element provides effective beam shaping and deflection.
- This approach offers a viable alternative to existing grating structures.
- The technology is compatible with various integration platforms.
