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Linking plasma formation in grapes to microwave resonances of aqueous dimers
2019/2/21 9:47:01

Dear XFNANO friends:

Science experiments always bring us new discoveries, especially those experiments which close to life let us approach to science and feel the miracles in it .

Recently, Professor Aaron D. Slepkov's research team from Trent University, Canada showed us a very interesting experiment and they published the paper on PNAS named “Linking plasma formation in grapes to microwave resonances of aqueous dimers”, this experiment is understandable and is worth learning.

The sparking of cut grape hemispheres in a household microwave oven has been a poorly explained Internet parlor trick for over two decades. By expanding this phenomenon to whole spherical dimers of various grape-sized fruit and hydrogel water beads, they demonstrate that the formation of plasma is due to electromagnetic hotspots arising from the cooperative interaction of Mie resonances in the individual spheres. The large dielectric constant of water at the relevant gigahertz frequencies can be used to form systems that mimic surface plasmon resonances that are typically reserved for nanoscale metallic objects. The absorptive properties of water furthermore act to homogenize higher-mode profiles and to preferentially select evanescent field concentrations such as the axial hotspot. Thus, beyond providing an explanation for a popular-science phenomenon, they outline a method to experimentally model subwavelength field patterns using thermal imaging in macroscopic dielectric systems.


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