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Terahertz grafted perfect vortex beams with controllable grafted topological charges
Optics Express
|February 20, 2026
Summary
Researchers developed a novel terahertz grafted perfect vortex beam (PVB) with controllable topological charges (TCs) and proportions. This innovation enhances light-field engineering by offering new ways to manipulate orbital angular momentum distributions.
Area of Science:
- Optics and Photonics
- Terahertz (THz) Technology
- Light Field Engineering
Background:
- Perfect vortex beams (PVBs) are crucial for applications requiring precise control over light's orbital angular momentum (OAM).
- Existing methods for generating PVBs often have limitations in controlling the superposition and proportion of topological charges (TCs).
Purpose of the Study:
- To demonstrate a novel terahertz (THz) grafted perfect vortex beam (PVB) with independently controllable integer or fractional topological charges (TCs) and their proportions.
- To explore the potential for enhanced multidimensional light-field engineering through flexible OAM manipulation.
Main Methods:
- Generation of pure-phase holograms for THz grafted PVBs using a modified dual-constraint Gerchberg-Saxton algorithm.
- Fabrication of phase hologram plates via 3D-printing for experimental validation.
- Simulation and experimental verification of beam characteristics.
Main Results:
- Successfully demonstrated a THz grafted PVB with arbitrarily combinable integer or fractional TCs.
- Independently controlled the grafted proportion of TCs and other beam parameters like ring radius and gap position.
- Validated the design parameters' influence on the THz grafted PVBs through simulations and experiments.
Conclusions:
- The developed THz grafted PVB offers unprecedented control over OAM distributions.
- This advancement significantly increases the diversity of OAM states, providing new degrees of freedom for advanced light-field engineering.
- The findings pave the way for novel applications in areas requiring sophisticated light manipulation.
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