Sub-diffraction ghost imaging with holographic pattern illumination

It is expected that subwavelength-scale structures will be used in various fields due to their unique properties. However, the diffraction limit makes it difficult to observe structures smaller than this wavelength. Our focus was on the sub-diffraction spot generation method to control the light intensity distribution below the diffraction limit. Sub-diffraction spots serve as illumination patterns for ghost imaging and allow imaging below the diffraction limit. In this study, guidelines for designing arbitrary patterns as sub-diffraction spot patterns were proposed. Validation experiments have shown that it is possible to image structures below 55% of the Rayleigh diffraction limit.