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Generating a Bessel beam by using a twisted integrated silicon photonic chip.
Optics Express
|September 23, 2025
Summary
Researchers extended Bessel beam propagation length by rotating sub-beams using a novel photonic chip. This new method generates longer Bessel beams for advanced imaging and sensing applications.
Area of Science:
- Optics and Photonics
- Nanotechnology
Background:
- Bessel beam propagation length is critical for imaging but difficult to extend.
- Fixed conical angles limit the generation structure's capabilities.
Purpose of the Study:
- To extend the propagation length of Bessel beams.
- To introduce a novel method for Bessel beam generation using sub-beam rotation.
Main Methods:
- Designed and fabricated a crooked-headed photonic chip with a 30° angle.
- Utilized sub-beam rotation to synthesize Bessel beams.
- Introduced the decentered Gaussian beam (DGb) model for grating and optical phased arrays (OPA).
Main Results:
- Achieved a Bessel beam length of 900 µm at 1528 nm wavelength.
- Demonstrated a hyperbolic surface path for beam synthesis, prolonging the overlap region.
- Validated theoretical calculations with experimental results, showing accurate beam steering.
Conclusions:
- The sub-beam rotation method offers a new scheme for Bessel beam generation.
- The DGb model accurately describes beam steering and is applicable to OPA and LiDAR.
- Silicon photonic chips enable on-chip solutions for particle rotation, communication, and sensing.
