Millimeter Wave Detection via Autler-Townes Splitting in Rubidium   Rydberg Atoms
  In this paper we demonstrate the detection of millimeter waves via Autler-Townes splitting in 85Rb Rydberg atoms. This method may provide an independent, atom-based, SI-traceable method for measuring mm-wave electric fields, which addresses a gap in current calibration techniques in the mm-wave regime. The electric- field amplitude within a rubidium vapor cell in the WR-10 waveguide band is measured for frequencies of 93 GHz, and 104 GHz. Relevant aspects of Autler-Townes splitting originating from a four-level electromagnetically induced transparency scheme are discussed. We measure the E-field generated by an open-ended waveguide using this technique. Experimental results are compared to a full-wave finite element simulation. 
Joshua A. Gordon, Christopher L. Holloway, Andrew Schwarzkopf, Dave A.   Anderson, Stephanie Miller, Nithiwadee Thaicharoen,...
physics.atom-ph