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← ScienceWhich consequence results when dielectric breakdown surpasses a threshold voltage during terahertz pulse propagation inside a waveguide?
A)Waveguide impedance decreases gradually
B)Pulse phase velocity is unaffected
C)Reverse current propagation dominance
D)Carrier avalanche causes plasma formation✓
💡 Explanation
Plasma formation ensues because impact ionization avalanches when terahertz pulses reach breakdown voltage, enhancing free carrier density and generating plasma; therefore, the intense electric field from pulse propagation enables ionization, rather than linear processes.
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