Demonstrating backflow in classical two beams' interference
- URL: http://arxiv.org/abs/2206.05242v3
- Date: Thu, 7 Jul 2022 11:52:21 GMT
- Title: Demonstrating backflow in classical two beams' interference
- Authors: Anat Daniel, Bohnishikha Ghosh, Bernard Gorzkowski, Radek Lapkiewicz
- Abstract summary: The maximum visibility fringes occur when the irradiance of the two beams is equal, and as the ratio of the beam intensities deviates from unity, fringe visibility decreases.
In this work, we experimentally observe the backflow phenomenon within this wavy wavefront.
Backflow appears in both optics (retro-propagating light) and in quantum mechanics where a local phase gradient is not present within the spectrum of the system.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The well-known interference pattern of bright and dark fringes was first
observed for light beams back in 1801 by Thomas Young. The maximum visibility
fringes occur when the irradiance of the two beams is equal, and as the ratio
of the beam intensities deviates from unity, fringe visibility decreases. An
interesting outcome that might not be entirely intuitive, however, is that the
wavefront of such unequal amplitude beams' superposition will exhibit a wavy
behavior. In this work, we experimentally observe the backflow phenomenon
within this wavy wavefront. Backflow appears in both optics (retro-propagating
light) and in quantum mechanics where a local phase gradient is not present
within the spectrum of the system. It has become an interesting subject for
applications as it is closely related to superoscillations whose features are
used in super resolution imaging and in a particle's path manipulations. The
first successful attempt to observe backflow was made only recently in an
assembly of optical fields, by synthesizing their wavefront in a complex
manner. Yet, backflow is perceived as hard to detect. Here, by utilizing
interference in its most basic form, we reveal that backflow in optical fields
is robust and surprisingly common, more than it was previously thought to be.
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