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Wavelength of SPP vs plasma density. (a) Varying in a wide scale. (b) Varying in a narrow scale nearby the threshold density of of SPP to be excited.
Schematic diagram of microwave plasma experimental setup: (a) top view and (b) side view.
Plasma light patterns observed at (a) , and (b) , .
Radial distributions of the electron density of argon plasma along the middle plane of the ring-shaped waveguide. Microwave power , argon gas pressure .
An interesting plasma light pattern observed at a microwave of and a pressure of .
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