Bessel beam

As with a plane wave, a true Bessel beam cannot be created, as it is unbounded and would require an infinite amount of energy.

[24] X-waves are special superpositions of Bessel beams which travel at constant velocity, and can exceed the speed of light.

In 2012 it was theoretically proven[27] and experimentally demonstrated[28] that, with a special manipulation of their initial phase, Bessel beams can be made to accelerate along arbitrary trajectories in free space.

In 2018, it was shown that the use of attenuation-compensation could be applied to Bessel beam based light-sheet microscopy and could enable imaging at greater depths within biological specimens.

[35] Bessel beams are a good candidate for the selectively trapping because of the concentric circles of pressure maximum and minimum in the transverse planes.