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Poisson/Arago's spot in water? 
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#1
Nov712, 09:15 PM

P: 1,412

Hello,
So Poisson's spot is a (peculiar) effect of light due to its wave nature (it's the bright point one would see in the middle of the shadow of a perfectly round coin). So I was wondering, has Arago's spot been observed for water waves too? For example in a 2D equivalent, i.e. for surface gravity waves. 


#2
Nov812, 08:42 AM

Sci Advisor
P: 5,510

Interesting.... it seems that there could be, but water waves are slightly different than electromagnetic waves the dispersion relation for example, and dissipation due to viscosity. Lamb only treats sound waves diffracted though a aperture that is smaller than the wavelength, and those results do not indicate any phenomenon similar to the spot of Arago.
Seems like a good undergraduate project, actually! 


#3
Nov812, 08:47 AM

Mentor
P: 11,589

The 2D equivalent would be like an inverted single slit experiment  should be observable.



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