研究目的
To overcome the limitation of conjugate symmetry between circular spin and opposite helicity OAM states from conventional spin–orbit approaches, enabling complete control of light’s angular momentum from lasers.
研究成果
The study successfully demonstrated a metasurface-enhanced laser capable of producing high-purity OAM states with quantum numbers up to ? = 100 and non-symmetric vector vortex beams with OAM states differing by Δ? = 90. This represents a significant advancement in controlling light’s angular momentum at the source, offering a compact and power-scalable solution for generating arbitrary chiral states of structured light.
研究不足
The study does not explicitly mention limitations, but potential areas for optimization could include further increasing the OAM values beyond ? = 100 and exploring the scalability of the metasurface fabrication process for higher damage threshold operation.
1：Experimental Design and Method Selection:
The study designed a metasurface-enhanced laser to control light’s angular momentum at source, using custom metasurfaces for arbitrary OAM coupling to linear polarization states.
2：Sample Selection and Data Sources:
The laser was constructed with a frequency-doubled cavity converting the infrared fundamental frequency of Nd:YAG to the second-harmonic green through an intracavity nonlinear crystal (KTP).
3：List of Experimental Equipment and Materials:
The setup included a nonlinear KTP crystal, a metasurface (J-plate) made of amorphous TiO2 nanoposts on a fused-silica substrate, and a Nd:YAG crystal rod.
4：Experimental Procedures and Operational Workflow:
The J-plate was placed in the resonant green cavity to provide a geometry for the first visible metasurface-assisted laser. The laser was gain-switched with the λ = 1,064 nm output pulse duration of 40 ns.
5：Data Analysis Methods:
The output beam was directed toward a spatial light modulator for modal decomposition in the LG basis, with the resultant field transformed in the Fourier plane and recorded using a charge-coupled device camera.
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