| Authors: | Y. Liu, N. Le Thomas, C. Leys, A. Yu Nikiforov | | Title: | Enhancing Local Ionization in Micro-Gap Atmospheric Discharge | | Format: | International Journal | | Publication date: | Accepted for publication. Not yet published | | Journal/Conference/Book: | New Journal of Physics
| | DOI: | 10.1088/1367-2630/adee3f | | Citations: | Look up on Google Scholar
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Abstract
Enhancement of local ionization in micro-gap atmospheric dielectric barrier discharges (DBD) is achieved experimentally via spatiotemporal control combining geometric confinement and harmonic excitation, namely adding a second-order harmonic to the applied voltage. Optimizing plasma emission near the dielectric surface is proposed as a possible route for ultraviolet plasma-on-chip sources (UV-POCS). This approach aims to overcome the lack of integrated UV sources compatible with photonic integrated circuits (PICs). Reducing the discharge gap down to 100 μm intensifies near-chip ionization and emission by enhancing the sheath electric field and sheath overlapping during polarity reversal. Harmonic excitation, especially with a 270ᣞ phase difference, amplifies peak gap voltages, redistributing power temporally to further enhance local ionization and emission on the chip surface. Experiments show 48% enhancement in surface emission with the combined techniques, alongside emission profile transitions from multi-layer to single-zone structures as the gap reduces. A 1D plasma model is presented to provide insight into emission characteristics and sheath dynamics, confirming spatiotemporal control of the electric field as a prospective strategy for enhancing surface ionization and efficiently coupling UV plasma emission into PICs. Related Research Topics
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