研究目的
Investigating the optical-trapping of a red Bessel beam controlled by a co-propagating green Gaussian beam in azobenzene liquid crystal.
研究成果
The bichromatic illumination of the azo-LC medium by red nondiffracting Bessel beam and weak green Gaussian beam in the co-propagation scheme leads to the formation of a waveguiding channel through the self-focusing of the Bessel beam central core. The study provides insights into the photo-isomerization rates in azo-LC and the potential applications in photonics and optical communication systems.
研究不足
The study was limited by the specific properties of the azobenzene liquid crystal used and the power levels of the laser beams. The absence of self-focusing for illumination with only red Bessel-like beam indicates that self-focusing threshold and critical length are not reached under certain conditions.
1：Experimental Design and Method Selection:
The study involved the simultaneous co-propagation of a red nondiffracting Bessel beam and a green Gaussian beam in a photosensitive azobenzene liquid crystal. The fine displacement of the Gaussian beam relative to the Bessel beam central maximum was used to study the Bessel beam distortion and controlled bending.
2：Sample Selection and Data Sources:
The azobenzene liquid crystal 1005 from BEAM Co was used. The beams' propagation and interaction were recorded by scattered light collected by an inverted microscope objective to a CCD camera.
3：List of Experimental Equipment and Materials:
A single-mode laser at 632.8 nm and 532 nm wavelengths, half-wave plates, polarizing beam splitters, confocal lenses, an axicon, a glass beam splitter, and a Thorlabs BP109 VIS Beam profiler were used.
4：8 nm and 532 nm wavelengths, half-wave plates, polarizing beam splitters, confocal lenses, an axicon, a glass beam splitter, and a Thorlabs BP109 VIS Beam profiler were used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The red Bessel beam was formed using an axicon and directed to the LC cell. The green Gaussian beam was adjusted to coincide nearly with the core of the Bessel beam. The beams' tracks were recorded by scattered light.
5：Data Analysis Methods:
The dynamics of the Bessel beam restoration and the self-focusing feature were analyzed using computer treatment of the beam tracks and transverse scans of the beam traces.
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