研究目的
Investigating the generation of droplet quasi-Bessel beams using a conical lens with a rounded tip for applications in micromanipulation of biological objects and super-resolution microscopy.
研究成果
The 'droplet' quasi-Bessel beams generated using a conical lens with a rounded tip can be effectively used for micromanipulation of biological objects and in super-resolution microscopy. The method allows for considerable simplification and miniaturization of the experimental setup compared to systems based on spatial light modulators.
研究不足
The study is limited by the qualitative agreement between theoretical and experimental results, with some quantitative discrepancies in the intensity decrease rate of the quasi-Bessel beam’s central spot. The actual shape of the axicon’s rounded surface and the intensity distributions of the generating ray may differ from the theoretical models.
1：Experimental Design and Method Selection:
The study involved generating quasi-Bessel beams using a conical lens (axicon) with a rounded tip. The longitudinal distribution of the intensity of the obtained quasi-Bessel beam was studied to observe periodical intensity pulsations.
2：Sample Selection and Data Sources:
The radiation of a semiconductor fiber-pigtailed laser with the wavelength λ = 1064 nm was used. The beam was collimated by a 20× lens and passed through the axicon.
3：List of Experimental Equipment and Materials:
Semiconductor fiber-pigtailed laser diode, conical lens (axicon) with apex angle α = 160°, 20× focusing lens, photocamera, micropositioner.
4：Experimental Procedures and Operational Workflow:
The transverse intensity distribution was photographed at equal intervals of 10 μm. The set of resulting images was transformed into the longitudinal distribution of the intensity of the beam under investigation using the ImageJ program.
5：Data Analysis Methods:
The longitudinal distribution of the intensity was analyzed to observe the 'droplike' structure of the beam. Numerical modeling was performed to match the experimental results with theoretical calculations.
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