WebKeywords: Non-diffracting beams, Bessel Beams, Helicon beams, Collinear Bessel beams 1. INTRODUCTION The first experimental generation of a beam with limited-diffraction length dates back to 1954 by McLeod et. al. with an optical element he coined as axicon (meaning axis image) [1, 2]. Axicon is used to produce long and narrow focal WebIn electromagnetism, a helicon is a low-frequency electromagnetic wave that can exist in bounded plasmas in the presence of a magnetic field. The first helicons observed were …
Realization of Free‐Space Long‐Distance Self‐Healing …
Webcalled spiraling beam as a special case of helicon beams was proposed recently, whose intensity pattern is laterally displaced with respect to the optical axis and rotates as a … Web15 jun. 2024 · It is believed that it is these waves that provide electron heating in helicon discharges. There is also commonly believed that current antennas, widely used to ignite helicon discharges, excite essentially nonpotential Н modes, which then transform into TG modes due to plasma inhomogeneity. black and white snowflake photography
Realization of Free‐Space Long‐Distance Self‐Healing Bessel …
Web22 feb. 2024 · The results of beam propagation simulations, which are performed at various crystal temperatures, STEM probe convergence angles (10-50 mrad), and beam … WebWe report, in theory and experiment, on a new class of optical beams that are radially self-accelerating and nondiffracting. These beams continuously evolve on spiraling … WebPropagation-invariant or nondiffracting optical beams have received considerable attention during the last two decades. However, the pulsed nature of light waves and the structured property of optical media like waveguides are often overlooked. We here present a four-dimensional spatiotemporal approach that extends and unifies both concepts of conical … black and white snowflakes images