As with a plane wave a true Bessel beam cannot be created, as it is unbounded and therefore requires an infinite amount of energy . Reasonably good approximations can be made, however, and these are important in many optical applications because they exhibit little or no diffraction over a limited distance. Bessel beams are also self-healing, meaning that the beam can be partially obstructed at one point, but will re-form at a point further down the beam axis.
These properties together make Bessel beams extremely useful to research in optical tweezing, as a narrow Bessel beam will maintain its required property of tight focus over a relatively long section of beam and even when partially occluded by the dielectric particles being tweezed.
The mathematical function which describes a Bessel beam is a solution of Bessel's differential equation, which itself arises from separable solutions to Laplace's equation and the Helmholtz equation in cylindrical coordinates.
Plano-Convex Lenses create approximation of Bessel beams.(Plano-Convex (PCX) Axicons Create Approximation of Bessel Beams)
Feb 21, 2011; Featuring one conical surface and one plano surface, Plano-Convex Axicons produce non-diffractive ring-shaped beam that increases...