Observation of positive–negative sub-wavelength interference without intensity correlation calculation

We report an experimental demonstration of positive–negative sub-wavelength interference without correlation. Typically, people can achieve sub-wavelength effects with correlation measurement no matter by using bi-photon or thermal light sources. In this paper, we adopt a thermal light source, and we count the realizations in which the intensities of the definite symmetric points are above or below a certain threshold. The distribution of numbers of these realizations which meet the restriction will show a sub-wavelength effect. With proper constrictions, positive and negative interference patterns are demonstrated.

Determination of X-ray pulse duration via intensity correlation measurement of X-ray fluorescence. Erratum

Corrections to equations and experimental results in the paper by Inoue et al. [(2019). J. Synchrotron Rad. 26, 2050–2054] are made.