Ms. Donna Gabor Profile

Donna Gabor

at Univ of the Philippines

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Proceedings Article | 9 September 2019 Presentation + Paper

Tuning Bessel beam propagation properties with liquid media

Donna Gabor, Raphael Guerrero

Proceedings Volume 11107, 1110707 (2019) https://doi.org/10.1117/12.2528680

KEYWORDS: Bessel beams, Beam propagation method, Water, Interfaces, Refractive index, Glasses, Liquids, Refraction, Wave propagation, Ray tracing

Read Abstract +

Techniques for optical trapping and micromanipulation, as well as precision drilling, have resulted from the ability to generate different types of Bessel beams. A standard method for producing Bessel intensity profiles involves an annular slit and focusing lens. The fixed geometry of this optical system only allows the generation of a particular Bessel beam with specific propagation properties. To increase the flexibility of a conventional annulus-lens configuration, we introduce a fluid-based method for modifying the core diameter and propagation properties of zero-order Bessel beams. In our optical set-up, Bessel beams are created with a HeNe laser operating at 543 nm with an output power of 4 mW. An annular slit is placed at the front focal plane of a lens with f = 25 cm. A transparent, custom-built container composed of three fluid chambers, each 5 cm in length, is placed after the lens. Our experiments make use of two fluids: water (n = 1.33) and vegetable oil (n = 1.43). Without using any fluids, at a propagation distance of 50 cm from the lens, our set-up produces a Bessel beam with core diameter = 0.231 mm. When the beam passes through a sequence of oilair-water, the core diameter at the same distance increases to 0.241 mm. We also observe an extended maximum propagation distance for a beam that travels through this combination of media. Modification of Bessel beam propagation properties is consistent with a change in effective focal length brought about by refraction through the liquid components.

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