Role of the tangential electric field component to the terahertz jet and hook formation by dielectric cube and sphere

The mechanism of formation of a terahertz jet by a dielectric cuboid and a sphere surrounded by ideally conducting screens is considered. The maximum screen influence is observed when the screen is located near the alight cuboid base. The screen influence eases when the screen is shifting along the dielectric object. Power flux density localization area is almost completely shifted inside the object when the screen is situated in the center. The minimum influence is observed when screen placed in the shadow plane of the cuboid base. This effect caused by the screen influence on electric field component tangential to the side edges and thus on the power flux directed to the central axis of the object. The screen influence on the terahertz jet in spherical object has been compared. Value of the power flux density after passing the object is higher in a cuboid, but the focusing characteristics are better (appearing on shorter distances) in a sphere. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)

Automated summary

The mechanism of terahertz jet formation by a dielectric cuboid and a sphere surrounded by conducting screens was studied. The position of the screen has a significant impact on the power flux density localization area. Different screen positions affect the direction of the electric field component and power flux, resulting in differences in power flux density and focusing characteristics.