Active MMW/Terahertz Security System Based on Bessel Beams

<table>Description of THz security system: 1—the wall, 2—diffractive optic (axicon antenna), 3—nondiffractive beam, 4—detector, 5—trespasser.</table>

International Scholarly Research Notices

Figure 4: Active MMW/Terahertz Security System Based on Bessel Beams 