Weibull analysis of atmospheric pressure plasma generation and evidence for field emission in microwave split-ring resonators

摘要: The generation of atmospheric pressure microplasmas using microwave resonators is promising for many applications due to the possibility high electron densities and low electrode degradation. In particular, such plasmas may help enable reconfigurable metamaterials operating from GHz THz. Since plasma require tens hundreds plasmas, it important find ways reduce power required breakdown. Here, we study gold silver split-ring (SRRs) with a variety materials near interelectrode gap (Cu, CuO nanowires, aluminum oxide). We focus on those fabricated traditional thick film technique, screen-printing, fs- ns-laser ablation. use laser ablation allows us explore small sizes (7-100um) different lasers parameters enables produce microstructures. utilize Weibull statistics examine breakdown in Ar without deep ultraviolet illumination SRRs. Fabrication methods are shown influence both Q-factor SRRs voltage independently. It found that superior performance terms consistency related modulus. requirement varied as widely an order magnitude depending fabrication method material used Furthermore, consider differences seen between various relate this microstructure/material which suggests field-emission play role providing seed electrons This need appears be especially 40um smaller.