ZONE PLATE WITH SUBWAVELENGTH FOCUSING (OPTIONS) Russian patent published in 2021 - IPC H01Q15/12 

FIELD: radiophysics; diffraction quasi-optics.

SUBSTANCE: invention relates to radiophysics, namely to diffraction quasi-optics, it can be used as an element of lenses in flaw detection, radio vision devices and near-field microscopes. The zone plate known from the prototype with subwavelength focusing, consisting of coaxial alternating zones made of a dielectric, and with a focal length of no more than the wavelength of the radiation used, differs in that a conical nozzle is introduced. The phase profile of the zone plate is performed on a larger base of a truncated cone, with a cone height equal to the focal length of the zone plate, tapering towards the focus of the zone plate.

EFFECT: increase in the resolution of the zone plate while providing subwavelength focusing of radiation.

3 cl, 2 dwg