Active MMW/Terahertz Security System Based on Bessel Beams
Figure 3
The calculation experiment results: Quasi-color images of a Bessel beams: 1—the “normal” condition, 2—the wavelength was changed to −5% and the point-like source of radiation was moved up to from optical axis, 3—the wavelength was changed to +5%, and the point-like source of radiation was moved up to from optical axis. The color is proportional to the field intensity: from blue (low) to red (high).
