Precise amplitude, trajectory, and beam-width control of accelerating and abruptly autofocusing beams

TL;DR

This paper demonstrates precise independent control over the amplitude, trajectory, and beam width of accelerating and autofocusing beams by engineering input phase and amplitude, with practical formulas and experimental considerations.

Contribution

It introduces a method to independently control beam trajectory, amplitude, and width, and optimizes autofocusing beam parameters based on geometric properties.

Findings

Independent control of beam trajectory and amplitude achieved.

Beam width is determined solely by trajectory curvature.

Optimized autofocusing beams with sharper focus and higher contrast designed.

Abstract

We show that it is possible to independently control both the trajectory and the maximum amplitude along the trajectory of a paraxial accelerating beam. This is accomplished by carefully engineering both the amplitude and the phase of the beam on the input plane. Furthermore, we show that the width of an accelerating beam is related only on the curvature of the trajectory. Therefore, we are able to produce beams with predefined beam widths and amplitudes. These results are useful in applications where precise beam control is important. In addition we consider radially symmetric abruptly autofocusing beams. We identify the important parameters that affect the focal characteristics. Consequently, we can design autofocusing beams with optimized parameters (such as sharper focus and higher intensity contrast). In all our calculations the resulting formulas are presented in an elegant and practical form in direct connection with the geometric properties of the trajectory. Finally we discuss methods that can be utilized to experimentally realize such optical waves.