[논문]Computational Characterization of Microwave Planar Cutoff Probes for Non-Invasive Electron Density Measurement in Low-Temperature Plasma: Ring- and Bar-Type Cutoff Probes

Kim, Si Jun; Lee, Jang Jae; Lee, Young Seok; Yeom, Hee Jung; Lee, Hyo Chang; Kim, Jung-Hyung; You, Shin Jae

doi:10.3390/app10207066

[해외논문] Computational Characterization of Microwave Planar Cutoff Probes for Non-Invasive Electron Density Measurement in Low-Temperature Plasma: Ring- and Bar-Type Cutoff Probes 원문보기

Applied sciences, v.10 no.20, 2020년, pp.7066 -

Kim, Si Jun (Nanotech Optoelectronics Research Center, Yongin Gyonggi Province 16882, Korea) , Lee, Jang Jae (Applied Physics Lab for PLasma Engineering (APPLE), Department of Physics, Chungnam National University, Daejeon 34134, Korea) , Lee, Young Seok (Applied Physics Lab for PLasma Engineering (APPLE), Department of Physics, Chungnam National University, Daejeon 34134, Korea) , Yeom, Hee Jung (Korea Research Institute of Standards and Science, Daejeon 34113, Korea) , Lee, Hyo Chang (Korea Research Institute of Standards and Science, Daejeon 34113, Korea) , Kim, Jung-Hyung (Korea Research Institute of Standards and Science, Daejeon 34113, Korea) , You, Shin Jae (Applied Physics Lab for PLasma Engineering (APPLE), Department of Physics, Chungnam National University, Daejeon 34134, Korea)

Abstract ▼ AI-Helper

The microwave planar cutoff probe, recently proposed by Kim et al. is designed to measure the cutoff frequency in a transmission (S21) spectrum. For real-time electron density measurement in plasma processing, three different types have been demonstrated: point-type, ring-type (RCP), and bar-type (BCP) planar cutoff probes. While Yeom et al. has shown that the RCP and BCP are more suitable than the point-type probe for process monitoring, the basic characteristics of the ring- and bar-type probes have yet to be investigated. The current work includes a computational characterization of a RCP and BCP with various geometrical parameters, as well as a plasma parameter, through a commercial three-dimensional electromagnetic simulation. The parameters of interest include antenna size, antenna distance, dielectric thickness of the transmission line, and input electron density. Simulation results showed that the RCP has several resonance frequencies originating from standing-wave resonance in the S21 spectrum that the BCP does not. Moreover, the S21 signal level increased with antenna size and dielectric thickness but decreased with antenna distance. Among the investigated parameters, antenna distance was found to be the most important parameter to improve the accuracy of both RCP and BCP.

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