The radiation was guided through a tapered gold-coated quartz needle broadened by quartz carrier plates on both sides and radiated out of a slot (0.4 mm x 1.7 mm) on which the cells were spread in a monolayer. Yeastcells were fixed to the lower surface of a thin transparent agar layer (0.2 mm) filling the inner part of a smaller plastic ring. The agar layer and the cells rested on the quartz needle and the carrier plates. At the opposite surface of the quartz needle, a broader opening for microscopic viewing was covered with a fine metallic mesh suppressing RF leakage.
The MW field in the radiating slot was monomodal, and the EF was polarized in the y direction, surrounded by the MF in the x-z plane.