A cooler for an electrical component, including a pressure-tight vessel enclosing the electrical component and including a support plate above the electrical component, a bath of electrically insulating and evaporating liquid surrounding the electrical component within the vessel, a flow channel for cooling liquid on the support plate, and a heat exchange element. It also provides novel devices using nanoscale emitters for microwave amplifiers, electron-beam lithography, field emission displays and x-ray sources. The extracted image is contrasted with a layout design base to obtain a blind contact or Quasi-blind issue of contactvia plugs.