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Area of Science:

  • Electromagnetism
  • Metamaterials
  • Fluid Dynamics

Background:

  • Near-zero-index (NZI) media theoretically behave as ideal electromagnetic fluids.
  • In NZI media, electromagnetic power flow mimics ideal fluid motion, suppressing optical turbulence.
  • Conventional optical systems exhibit electromagnetic vortices, unlike NZI media.

Purpose of the Study:

  • To experimentally observe and verify the electromagnetic power flow in NZI media.
  • To demonstrate the inhibition of electromagnetic vorticity within NZI materials.
  • To introduce a method for exploring subwavelength behavior in NZI media.

Main Methods:

  • Utilized a semi-analytical reconstruction technique to map electromagnetic power flow.
  • Investigated wave propagation within a cutoff waveguide structure.
  • Compared experimental results at NZI frequencies with those outside the NZI range.

Main Results:

  • Direct experimental proof of inhibited electromagnetic vorticity at NZI frequencies.
  • Observed phase uniformity and spatially-static field distributions characteristic of NZI materials.
  • Confirmed the presence of power flow vortices in conventional media outside the NZI range.

Conclusions:

  • Experimental validation of NZI media as ideal electromagnetic fluids.
  • Demonstrated the suppression of optical turbulence and electromagnetic vorticity.
  • Provided a tool for subwavelength exploration of NZI media, including vectorial and phase information.