A plasma generator generates atmospheric pressure, low temperature plasma (cold plasma), and includes a thin plate-like first electrode defining a planar bottom surface. A thin plate-like second electrode defines a planar top surface. The second electrode opposes the first electrode, such that the bottom surface of the first electrode faces the top surface of the second electrode. A first dielectric layer is disposed on the bottom surface of the first electrode, and a second dielectric layer is disposed on the top surface of the second electrode. A spacer supports the first and second electrodes to define a predetermined gap between the first and second dielectric layers. A power supply supplies electrical power to the first and second electrodes at a predetermined voltage and frequency, such that, based on the predetermined gap between the first and second dielectric layers, cold plasma is generated.