Revisiting the double-slit experiment of light: from wave theory to pulse theory

Abstract: The double-slit experiment has long been celebrated as a foundational demonstration of the wave theory of light, with classic works like Optics emphasizing its role in illustrating wave interference. However, despite its theoretical importance, optical interference patterns are rarely observed in everyday settings, leading some scientists to question the robustness of this theory in practical applications. In this study, we conduct a thorough reevaluation of the double-slit experiment, scrutinizing traditional assumptions and exploring the origins of light and dark fringes. Our experimental results reveal that these fringe patterns are not caused by light wave interference as traditionally believed. Instead, they are the result of diffraction from the vertical walls of the slits. This finding challenges the conventional understanding of wave interference and suggests an alternative model based on the pulse nature of light, where overlapping spectra can enhance energy without resulting in cancelation. These insights offer a fresh perspective on the behavior of light and open new directions for future research in optics and photonics.