Miniaturizable plasma source

A plasma source with an oscillator, said oscillator having an active element and a resonator connected to the active element, wherein the resonator has a hollow body, a gas inlet, a gas outlet arranged at a distal end of the hollow body about a longitudinal axis of the hollow body, and a coil arranged within the hollow body along the longitudinal axis of the hollow body, said coil having an effective length of one quarter of a wavelength at a resonant frequency of the resonator, wherein a distal end of the coil is arranged relative to the gas outlet such that a plasma section can form between the distal end of the coil serving as a first plasma electrode and the gas outlet of the hollow body serving as a second plasma electrode, characterized in that the coil is lead out of the interior of the hollow body at a proximal end of the hollow body through an electrically contact-free feed-through, and a proximal end of the coil contacts the hollow body at its external side, wherein, at a first contact region located between the proximal end of the coil and the feed-through, the coil is coupled to a first gate of the active element, and at a second contact region located between the proximal end of the coil and the feed-through, the coil is coupled to a second gate of the active element.