EHF VARIFOCAL LENS Russian patent published in 2021 - IPC G02B3/14 G02B27/58 B82Y20/00 

FIELD: energy transmission systems; optical devices.

SUBSTANCE: lens can be used in energy transmission systems in the extremely high frequency (EHF) range and the terahertz frequency range, imaging planar devices, EHF microscopes, integrated quasi-optics devices, for entering radiation into waveguides, etc. An EHF varifocal lens consists of a mesoscale plane-convex spherical dielectric particle in the form of a liquid drop with a relative refractive index with respect to the surrounding space, varying in the range from 1.2 to 2, with a particle diameter of at least λ, where λ is the wavelength of radiation illuminating the particle from its flat base. The liquid drop absorbs radiation and is located on a solid transparent substrate with a refractive index approximately equal to the refractive index of the drop. The focal length of the drop is changed by changing the curvature of its free surface under the action of thermocapillary forces. The diameter of the forming beam does not exceed approximately 0.2 of the diameter of the drop.

EFFECT: ability to electrically control the focusing characteristics of a mesoscale device in the EHF range with focusing radiation with high spatial resolution.

5 cl, 1 dwg