WAVEGUIDE WITH SUBWAVELENGTH FOCUSING FOR TERAHERTZ ENDOSCOPY Russian patent published in 2023 - IPC G02B6/10 

FIELD: optics; transmitting; converting terahertz radiation beams.

SUBSTANCE: claimed waveguide with subwavelength focusing for terahertz endoscopy includes a hollow tube, on the outer surface of which there is a sheath. The inner diameter of the tube is no more than 6 mm, at the outlet end of the channel on the axis there is a sapphire spherical plano-convex lens with a diameter of 1 to 2 mm, directed by the convex part into the channel, and a sapphire plane-parallel plate is pressed to the flat surface of the sapphire spherical plano-convex lens and the end of the waveguide. The total thickness of the plate and lens is 0.75 of the lens diameter, and the thickness of the plate is no more than 0.25 of the lens diameter.

EFFECT: increase in the spatial resolution of endoscopic terahertz spectral diagnostics, an expansion of the operating temperature range and the list of possible research objects, including living biological objects.

1 cl, 3 dwg