| Abstract [eng] |
Theoretical studies in electromagnetics for generation of nondiffracting and nondispersive light pulses, which are crucial for various applications, are on the rise nowadays. Current technologies allow for the creation of short-duration, high-power pulses. To achieve better beam shaping control of non-diffracting and non-dispersive pulses, highly focused vector pulses are investigated. For this investigation different simulation methods were used for analyzing vector pulsed light beams with different polarization structures (linear, azimuthal and radial) and comparing them to scalar models. The effects of superluminal, subluminal, and negative group velocities on vector focus wave modes in both free space and dielectric materials were analyzed. In this work, the vector description is introduced for optical bullets, and using mathematical model presented in this work, it is possible to investigate the properties of the beam in dielectric media with group velocities that can be superluminal, subluminal, or even negative. The results allow us to understand the relations between transverse size of the beam, the intensities of each component (paying special attention to the longitudinal component of the electric field) depending on the central frequency, polarizations and different group velocities. |
