I have no idea if this any potential practical application, but it is certainly a curious result that it appears a signal can be sent with no energy from the sender arriving:
We show that it is possible to use a massless field in the vacuum to
communicate in such a way that the signal travels slower than the speed of
light and such that no energy is transmitted from the sender to the receiver.
Instead, the receiver has to supply a signal-dependent amount of work to switch
his detector on and off. This type of signalling is related to Casimir-like
interactions and it is made possible by dimension ---and curvature--- dependent
subtleties of Huygens' principle.
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