Terahertz microscope with oblique subwavelength illumination: design principle

It is shown that the image contrast in the air when using a microscope based on dielectric microparticles with a size of the order of wavelength can be significantly enhanced with the help microparticles that provide the formation of the radiation localisa-tion region at an angle to the direction of radiation incidence (at an angle to the optical axis). For this purpose, a screen is placed in front of the particle, which blocks part of the incident beam, forming a photonic hook or a photonic jet (terajet) with oblique illumina-tion in the near field.

Automated summary

It has been demonstrated that the image contrast in the air can be significantly improved when using a microscope based on dielectric microparticles with a size similar to the wavelength. This is achieved by placing a screen in front of the particle to block part of the incident beam, resulting in oblique illumination of a photonic hook or a photonic jet (terajet) in the near field.