Author(s):

Ghosh, Bohnishikha; Daniel, Anat; Gorzkowski, Bernard & Lapkiewicz, Radek

Abstract:

“M.V. Berry’s work [J. Phys. A: Math. Theor. 43, 415302 (2010)] highlighted the correspondence
between backflow in quantum mechanics and superoscillations in waves. Superoscillations refer to
situations where the local oscillation of a superposition is faster than its fastest Fourier component.
This concept has been used to demonstrate backflow in transverse linear momentum for optical
waves. In this work, we examine the interference of classical light carrying only negative orbital
angular momentum and observe in the dark fringes of such an interference, positive local orbital
angular momentum. This finding may have implications for the studies of light-matter interaction
and represents a step towards observing quantum backflow in two dimensions.”

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