INTERFEROMETER FOR SURFACE PLASMON-POLARITONS IN TERAHERTZ RANGE Russian patent published in 2023 - IPC G01B9/02 G01N21/45 

FIELD: optics.

SUBSTANCE: interferometer for surface plasmon-polaritons in the terahertz range. The interferometer contains a source of collimated p-polarized monochromatic radiation, an element for converting radiation into a beam of surface plasmon-polaritons, a solid-state sample with a flat edge capable of directing surface plasmon-polaritons, a splitter of the initial beam of surface plasmon-polaritons, two flat mirrors placed on the edge, and a single-pixel photodetector a device located near a section of the edge of a face illuminated by both secondary beams, and an information processing device. One of the flat mirrors is fixed and removable, and the second mirror can move along the direction of propagation of the secondary beam. The device additionally contains a Michelson interferometer for volume waves of radiation from the source. The interferometers are placed in a sealed chamber filled with a transparent medium in the gas phase.

EFFECT: improved accuracy of determining the real part of the complex refractive index of terahertz surface plasmon-polaritons.

1 cl, 1 dwg