Figure 2
From: Controllable light capsules employing modified Bessel-Gauss beams
Control of the sizes and the darkness degree of the light capsule.
(a) Sketch definition of the radial and axial sizes of the light capsule. (b) The relationship between radial (red line) or longitudinal (blue line) size of the null field in optical capsule and the increasing parameter σ. (c) The control of the darkness degree inside the optical bottle. This can be verified by comparing the central intensity values of the on-axis intensity profiles for different cases (σ = 1.1 and σ = 2.5). The inset shows the intensity map of the corresponding two cases, in which the darkness degree inside the light capsules can be clearly observed.
