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Updated: Nov 19, 2025

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Observation of positive-negative sub-wavelength interference without intensity correlation calculation
Ling-Yu Dou1, De-Zhong Cao2, De-Qin Xu3
1School of Physics, Beijing Institute of Technology, Beijing, 100081, China.
Abstract:
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.
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